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- ArticleYalnız künye2025Comparative Study of Antidiabetic and Antioxidant Properties of Viburnum opulus L. and Viburnum lantana L. (Viburnaceae): LC–MS/MS Profiling of Phenolic Compounds
Effatparvar, Zahra; Aydın, Bilge; Yuca, Hafize; Önal, Mehmet; Zengin, Gökhan; Çiçek Kaya, Ayşe; Karakaya, Songül; Santanatoglia, Agnese; Mustafa, Ahmed; Caprioli, Giovanni
This study aimed to evaluate antidiabetic and antioxidant properties of Viburnum opulus and Viburnum lantana aerial parts methanolic extracts, alongside identification of their bioactive constituents using LC–MS/MS analysis. LC–MS/MS analysis revealed that V. lantana leaves had the highest total polyphenol content (78.955 µg/g dry extract), followed by V. opulus twigs (67.203 µg/g dry extract), with chlorogenic acid being the predominant compound in both species. Antidiabetic potential was assessed through inhibition of α-amylase and α-glucosidase enzymes, while antioxidant activity was determined via ABTS and DPPH radical scavenging assays. In the α-glucosidase inhibition assay, methanolic extracts from leaves, fine branches, and fruits of both species exhibited greater inhibitory activity than the positive control, acarbose, with the leaf extract of V. lantana displaying the strongest inhibition. Regarding antioxidant capacity, V. lantana leaf extracts demonstrated the highest efficacy, outperforming α-tocopherol and Trolox. Notably, in the ABTS radical scavenging assay, V. lantana leaf extracts exhibited superior inhibitory effects compared to α-tocopherol and Trolox.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2025From Herbal Tea to Science: Phytochemical and Biological Investigation of Ajuga chamaepitys subsp. chia (Lamiaceae) With Molecular Docking Analysis
Aydın, Bilge; Aydın, Amine Sena; Çeçen, Ömer; Yuca, Hafize; Bona, Gülnur Ekşi; Demirci, Betül; Bona, Mehmet; Karakaya, Songul
The hypothesis that insulin resistance and impaired insulin-like growth factor signaling contribute to Alzheimer's disease (AD) has led to the designation of AD as “type 3 diabetes.” Ajuga chamaepitys subsp. chia is traditionally used in Türkiye as an analgesic, tonic, and for the external treatment of hemorrhoids and wound healing. This study evaluates antioxidant, antidiabetic, and anticholinesterase activities of methanolic, aqueous extracts, and essential oils from the flowering aerial parts of A. chamaepitys subsp. chia, along with their phytochemical profiles (GC–MS/MS), morphological-anatomical characteristics, and molecular docking analysis. The essential oil yield was 0.002%, comprising 45 compounds (92.5%), with β-pinene (19.8%), α-pinene (12.8%), and germacrene D (10.0%) as major constituents, dominated by monoterpene (39.8%) and sesquiterpene hydrocarbons (23.5%). The methanolic extract exhibited moderate bioactivity, achieving 28.36% α-amylase inhibition at 5000 μg/mL and 21.85% acetylcholinesterase inhibition at 100 μg/mL, while also demonstrating notable antioxidant activity with 23.013% ABTS•+ and 8.114% DPPH• scavenging. It showed the highest total phenolic (14.261 μg GAE/mg) and tannin content (34.444 μg TAE/mg) among the tested extracts. Morphologically, the plant features hairy stems and tripartite leaves with a cuticle, trichomes, and diacytic stomata, while anatomically, it presents collenchyma, starch-filled parenchyma, and a distinct cambium in the stem. Molecular docking studies revealed that germacrene D exhibited strong binding affinities to acetylcholinesterase, butyrylcholinesterase, α-amylase, and α-glucosidase, suggesting multitarget inhibition potential. These findings support the traditional use of A. chamaepitys subsp. chia and highlight its promise as a natural source for therapeutic agents targeting oxidative stress, diabetes, and neurodegenerative diseases.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2025In Vitro Evaluation of Antidiabetic, Antioxidant, and Anticholinergic Properties of Different Parts of Bilberry (Vaccinium myrtillus L.) From the Eastern Black Sea Region, With LC/MS–MS Analysis of Their Chemical Composition in Food Applications
Yuca, Hafize; Ayar, Beyzanur; Aydın, Bilge; Çoban, Furkan; Karakaya, Songül
Diabetes, the most prevalent metabolic disorder, is closely linked to Alzheimer's disease, with DM patients showing a two-fold increased risk of developing AD. Bilberry (Vaccinium myrtillus L.) is a prominent wild berry, widely used in juice and food production. This study aimed to evaluate and compare the phytochemical composition and biological activities of different parts of wild V. myrtillus plants, including branches, leaves, and fruits. Using LC–MS/MS, the study quantifies total phenolics, flavonoids, and tannins in each part. Biological activities are assessed through antioxidant activity (ABTS and DPPH assays), anticholinesterase (neuroprotective potential), and antidiabetic effects. The experiments revealed that the Leaf of Yer Ligarba (YLL) extract had the highest values in terms of total phenolic content, total flavonoid content, and total tannin content. Among the extracts, the highest radical scavenging effect was observed with YLL at 86.67% against DPPH. The leaf extracts, Leaf of Dal Ligarba (DLL) and YLL, demonstrated the highest scavenging effects, with inhibition rates of 99.37% and 99.37%, respectively. At one of the common concentrations, 100 μg/mL, acarbose showed 13.12% inhibition, while the Branch of Dal Ligarba (DLB) extract exhibited 98.67% α-glucosidase enzyme inhibition. The highest acetylcholinesterase and butyrylcholinesterase enzyme inhibition activities were observed in the Branch of Yer Ligarba (YLB; 27.08%) and the Fruit of Dal Ligarba (DLF; 16%), respectively. Chlorogenic acid was the most abundant phenolic compound, particularly in the DLL 58,569.80 ng/mL. This study highlighted the significant phytochemical content and biological activities of wild bilberry extracts, demonstrating their potential for managing diabetes and neurodegenerative diseases, particularly Alzheimer's.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2025Analyzing Quinoa Seeds: LC–MS/MS and GC–MS/MS Approaches for Identifying a Nutrient-Rich Functional Food in Alzheimer's and Diabetes Care
Çoban, Furkan; Yuca, Hafize; Aydın, Bilge; Tosun, Murat; Yazıcı, Abdullah; Karakaya, Songül; Tan, Mustafa; Özer, Hakan; Atila, Alptuğ
Quinoa is a versatile, nutrient-dense, gluten-free pseudocereal, increasingly recognized for its potential health benefits, particularly in managing diabetes mellitus and Alzheimer's disease—two conditions with growing links. Recent research on 14 quinoa genotypes explored fatty oil composition and bioactive potential of quinoa extracts. Linoleic acid was predominant fatty acid (46.60%–56.33%), whereas alanine was the most concentrated amino acid across all active extracts (192.4887–1578.0355 nmol/mL). French Vanilla hexane extract exhibited the strongest α-glucosidase inhibition (75.71%), with Santa Ana hexane extract showing the highest α-amylase inhibition (28.58%). Additionally, Titicaca hexane extract displayed notable acetylcholinesterase inhibition (22.22%), and Moqu Arochilla methanol extract had the most potent butyrylcholinesterase inhibition (47.20%). Antioxidant assays revealed that Salcedo and French Vanilla extracts had exceptional 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, with positive correlations found between total phenolic content and antioxidant activity (DPPH, β-carotene, FRAP). These findings emphasize quinoa's potential as a functional food, offering significant benefits for disease management.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2024Investigation of the Potential Antioxidant and Antidiabetic Effects of Cotinus coggygria Scop.
Yuca, Hafize; Aydin, Bilge; Güvenalp, Zühal; Canpolat, Alperen
Objective: The aim of this study is to evaluate and compare the total phenolic content, total flavonoid content, antioxidant activities (DPPH• and ABTS•+ scavenging effects), and α-glucosidase inhibition effects of different parts of Cotinus coggygria Scop. (green leaves, red leaves, branches, and the heartwood) collected at different times. Methods: The total phenolic content of the extracts was determined using the method developed by Folin and Denis and modified by Singleton. The total flavonoid content was determined according to the method developed by Lar'kina and colleagues. To test the antioxidant capacities of the extracts, DPPH• and ABTS•+ scavenging capacity assays were conducted; and to test their antidiabetic effects, α-glucosidase enzyme inhibition assay was performed. Results: It was found that the heartwood extract had the highest values in terms of total phenolic content and total flavonoid content. In the antioxidant activity assays, similar to the results of the total phenolic and total flavonoid content determinations, the heartwood extract also showed the highest content. However, it was observed that all other extracts also exhibited high antioxidant activity, especially against the ABTS•+. In the α-glucosidase inhibition assay conducted to examine the antidiabetic effects of the extracts, it was found that in addition to red and green leaves, other extracts also possessed antidiabetic activity. Conclusion: The antioxidant and antidiabetic effects of extracts obtained from different parts of C. coggygria, a species used in traditional medicine for its various therapeutic effects, have been scientifically evaluated, proven, and compared.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2024Exploring Astrodaucus orientalis (L.) Drude: Phytochemical Analysis and its Biological Potential Against Alzheimer's and Diabetes
Yuca, Hafize; Aydin, Bilge; Karakaya, Songul; Goger, Gamze; Bingöl, Zeynebe; Civas, Ayşe; Koca, Mehmet; Demirci, Betül; Sytar, Oksana; Gulcin, Ilhami
In current study antioxidant, antidiabetic, antimicrobial, anticholinesterase, and human carbonic anhydrase I, and II (hCA I and II) isoenzymes inhibition activities of Astrodaucus orientalis different parts were investigated. Achetylcholinesterse (AChE) and butyrylcholinesterse (BChE) inhibitory activities of octyl acetate were determined via molecular docking. Quantitative assessment of specific secondary metabolites was conducted using LC-MS/MS. An examination of chemical composition of essential oils was carried out by GC-MS/MS. A thorough exploration of plant‘s anatomical characteristics was undertaken. The highest phenolics level and DPPH antioxidant capacity were seen in root and fruit. Fruit essential oil demonstrated the highest AChE inhibition (44.13±3.61 %), while root dichloromethane sub-extract had the best inhibition towards BChE (86.13±2.58 %). Cytosolic hCA I, and II isoenzymes were influentially inhibited by root oil with 1.974 and 2.207 μM IC50 values, respectively. The most effective extracts were found to be root all extract/sub-extracts (except water) against C. tropicalis and C. krusei strains with MIC value 160>μg/mL. Sabinene (29.4 %), α-pinene (20.2 %); octyl acetate (54.3 %); myrcene (28.0 %); octyl octanoate (71.3 %) were found principal components of aerial parts, roots, flowers, and fruits, respectively. Flower essential oil, fruit dicloromethane and ethyl acetate exhibited potent α-glucosidase inhibitory activity with 900, 40, and 937 μg/mL IC50 values, respectively.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2024Comparative content analysis and biological activity studies of fatty and essential oils from some garlic products sold in Turkish community pharmacies, natural, and fermented garlic
Deniz, Elif Ulutaş; Yuca, Hafize; Aydın, Bilge; Öztürk, Gözde; Çoban, Furkan; Göger, Gamze; Demirci, Betül; Karakaya, Songül
Garlic (Alliaceae), an annual herb, is renowned not only for its distinctive flavor but also for its extensive therapeutic applications in managing various ailments and health conditions. In this study, garlic products identified as the best-selling items in Turkish pharmacies for various purposes were compared with garlic grown under standard conditions in terms of chemical composition and antidiabetic, anticholinesterase, antimicrobial, and antioxidant properties. Three of garlic samples were prepared by researchers. According to survey results, the most commonly sold garlic-related products in pharmacies are black garlic extract tablets (4), capsules (5), garlic oil (6), garlic oil pearls (7), and fermented garlic (8). Diallyl disulfide (DADS) was identified as a predominant compound in sampled oils, ranging from 4.9% to 48.6%. Another noteworthy finding is the identification of allyl methyl disulfide and allyl methyl trisulfide as major components in sampled oils, with concentrations spanning from 2.9% to 9.8% and 0.4% to 17.5%, respectively. In both 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic) acid (ABTS·+) and 2,2-diphenyl-1-picrylhydrazyl (DPPH•) tests, Sample 1 (fermented) exhibited the highest antioxidant activity. Sample 3 (cultivated) was richer in total phenol–total tannin content. Sample 6 exhibited the highest α-glucosidase inhibition among antidiabetic activities, reaching 28.93%. Sample 5 capsules demonstrated the highest α-amylase inhibition at 51.50%. Sample 7 exhibited the most notable inhibition against both acetylcholinesterase (22.92%) and butyrylcholinesterase (13.37%). Samples 3, 6, and 8 were found to be more effective against Candida tropicalis with minimum inhibitory concentration (MIC) = 625 μg/mL. A comprehensive study on garlic products, including popular items from Turkish pharmacies and those grown under standard conditions, revealed diverse chemical compositions and multifaceted health properties.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2023Anatomical, Morphological, and Chemical Characterizations and Biological Activities of Gagea taurica Steven (Liliaceae): A New Record for the Turkish Flora
Yuca, Hafize; Karakaya, Songul; Ekşi, Gülnur; Aydin, Bilge; Goger, Gamze; Bona, Mehmet; Tekman, Enes; Şahin, Aydan Acar; Sytar, Oksana; Pinar, Nur Münevver
Gagea genus, which is native to the Mediterranean and Black Sea regions, has attracted significant attention due to its biodiversity and potential health benefits. In this study, the biochemical composition and biological activities of methanol extracts from various parts of G. taurica were investigated, along with their anatomical and morphological characteristics. The best antimicrobial activity was found to be MeOH extracts of corm and leaf against several Candida strains with MIC=640 μg/mL. The highest level of phenolics together with significant results of antioxidant activities were observed in flowers extracts. The α-amylase inhibition assay results showed that the highest inhibition percentage was observed with acarbose (59 %), followed by leaf extract (43 %). Leaf exhibited the most effective inhibitory activity in AChE inhibition assay, whereas flower demonstrated the most significant inhibitory activity in BChE inhibition assay. Hesperidin was found as 1621.0001 ng/ml value in flower extract and 283.9339 ng/ml value leaf.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2023The anatomical, morphological features, and biological activity of Scilla siberica subsp. armena (Grossh.) Mordak (Asparagaceae)
Aydın, Bilge; Yuca, Hafize; Karakaya, Songul; Bona, Gülnur Ekşi; Göger, Gamze; Tekman, Enes; Şahin, Aydan Acar; Sytar, Oksana; Civas, Ayşe; Canlı, Deniz
Scilla siberica subsp. armena is known as Siberian Squill which is naturally distributed in Lebanon-Syria, Transcaucasus, and Turkey. It is a perennial bulbous plant with a short vegetation period from March to May. In this study, the antimicrobial, antioxidant, α-amylase, and α-glucosidase inhibitory activities of corm, leaf, and flower methanolic extracts were examined. The anatomy and morphology of the plant organs were investigated by light and electron microscopes. The anatomy of S. siberica subsp. armena was investigated for the first time by electron microscopy in this study. The corm, leaf, and flower methanolic extracts were assessed against E. coli ATCC 8739, S. aureus ATCC 6538, B. subtilis ATCC 19,659, C. albicans ATCC 10,231, C. krusei ATCC 14,243, and C. tropicalis ATCC 750. Among the extracts, that obtained from the blue pollen showed the best antimicrobial activity against C. tropicalis ATCC 750 strain with a MIC value of 312.5 µg/mL. The highest phenolic content was determined in leaf extract with 53.59211 µg GAE/mg extract value. The extract showed the best anti-lipid peroxidation activity with 376.69 µg/mL value. Using DPPH· and ABTS·+ tests, it was determined that the flower and leaf extracts have the best activity (IC50 = 756.13 μg/mL and IC50 = 94.07 μg/mL, respectively). The flower extract exhibited α-glucosidase inhibitory activity with the IC50 value of 5239 µg/mL. Based on the presented results of the in vitro antimicrobial, antioxidant, and antidiabetic activities of the S. siberica subsp. armena, we suggest that natural compounds from S. siberica subsp. armena are of potential use for the improvement of an antidiabetic, antioxidant, and antimicrobial agent. Graphical abstract: [Figure not available: see fulltext.]
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2023COMPARISON OF SOME BIOLOGICAL ACTIVITIES AND CATECHIN TANNIN CONTENTS OF TWO JUNIPERUS AND PRUNUS SPECIES; [İKİ JUNİPERUS VE PRUNUS TÜRÜNÜN BAZI BİYOLOJİK AKTİVİTELERİNİN VE KATEŞİN TANEN İÇERİKLERİNİN KARŞILAŞTIRILMASI]
Yuca, Hafize; Demi̇Rcan, Hakkı Cem; Aydin, Bilge; Önal, Mehmet; Tekman, Enes; Ci̇Vaş, Ayşe; Nobari̇Rezaeyeh, Mohaddeseh; Göger, Gamze; Karakaya, Songül; Güvenalp, Zühal
Objective: Qualitative and quantitative determination of catechin in fruits of J. communis var. saxatilis, J. oxycedrus subsp. oxycedrus, P. spinosa, and P. cerasifera was analyzed by LC-MS/MS using standards. Antidiabetic, antimicrobial, and antioxidant activities of fruit and cone extracts of these plants were evaluated. Qualitative analysis of secondary metabolites was also done. Material and Method: Antimicrobial activity was done with MIC. ABTS·+ and DPPH• scavenging activies were used antioxidant activity. α-Amylase and α-glucosidase inhibition assays were done for antidiabetic activity. Result and Discussion: JCS (IC50 = 578 ± 20 μg/ml), JOO (IC50 = 3706 ± 52 μg/ml), and PS (IC50 = 313 ± 7 μg/ml) extracts were observed to show a higher activity than acarbose (IC50 = 4061 ± 146 μg/ml). J. communis var. saxatilis fruit extract was observed with MIC values between (312.5 - 2500 µg/ml) against all microorganisms. JCS extract has the highest phenolic composition and JOO has the lowest phenolic composition (µg GAE/ mg extract). JCS extract indicated the highest antioxidant activity. It was determined that plant containing the highest catechin (1173.3±5.77 ng/ml) and epigallocatechin (208±7.21 ng/ml) was JCS. In this research, it can be said that JCS with the highest tannin content shows the highest effects.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2023Qualitative and quantitative phytochemicals of essential oils and extracts of Thymbra spicata subsp. spicata L. as a spice for diabetes mellitus
Yuca, Hafize; Civaş, Ayşe; Tekman, Enes; Nadiroğlu, Rozerin; Karakaş, Şeydanur; Dürüster, Şeyma; Keçeci, Emire Bengisu; Bona, Mehmet; Nobarirezaeyeh, Mohaddeseh; Aydin, Bilge
The aim of this paper was to evaluate the antidiabetic and antioxidant activities of methanolic extracts, n-hexane, dichloromethane, ethyl acetate, butanol, aqueous subextracts and essential oils of flowers, roots, leaves and aerial parts of Thymbra spicata subsp. spicata, which has been utilized in the public medicine systems of Turkey, Greece, Egypt and Rome for the treatment of asthma and bronchitis, as well as for flavour and aroma in the food industry and protection. Quantitative determination of secondary metabolites in the most effective samples of the plant was also analysed by LC–MS/MS. Moreover, the chemical composition of essential oils of different parts of the plant was analysed via GC-FID and GC/MS. The main constituents in the flower, leaf and aerial part were found to be carvacrol (75.6%), γ-terpinene (10.5%), carvacrol (73.3%), γ-terpinene (9.5%), p-cymene (8.6%), carvacrol (76.1.8%) and p-cymene (7.3%), respectively. Quinic acid, caffeic acid, vanillic acid, naringin, hesperidin and rosmarinic acid were measured in four ethyl acetate subextracts, and rosmarinic acid was found to have the highest amount in the flower subextract with a value of 48095.1083 ng/mL. The ethyl acetate extract of flowers showed the best activity with a 326 ± 12 μg/mL IC50 value, while the standard acarbose IC50 value was 4143 ± 243 μg/mL. It was determined that the leaf ethyl acetate extract, in particular, had a very high % inhibition value on ABTS·+ (99.137 ± 0.011% inhibition) and DPPH• (41.068 ± 0.031% inhibition). It is thought that the plant, which has been used as a spice in the kitchen for centuries by the public, can be safely used due to its high antidiabetic and antioxidant effects.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2023Phytochemical screening, biological evaluation, anatomical, and morphological investigation of Ferula tingitana L. (Apiaceae)
Karakaya, Songül; Yuca, Hafize; Yılmaz, Gülderen; Aydın, Bilge; Tekman, Enes; Ekşi, Gülnur; Bona, Mehmet; Göger, Gamze; Karadayı, Mehmet; Gülşahin, Yusuf
Ferula tingitana L. is a high perennial plant and its leaf is an alternate arrangement and yellow, and its flowers are unisexual like other Apiaceae. It has been used as a spice and for various medicinal purposes in the Mediterranean region. The paper reports antidiabetic, antimicrobial, anticholinesterase, antioxidant, and genotoxic activities of leaves, flowers, stems, and fruits methanol extracts of F. tingitana. Also, quantitative determination of some secondary metabolites was also analyzed by LC-MS/MS. Moreover, chemical composition of essential oils was analyzed. Consequently, anatomical, and morphological properties of plant were investigated. Germacrene D (23.6%), 1,3,5-trimethylbenzene (18.4%), and α-pinene (50.0%) were found as the main compounds in flower, leaf, and stem oils, respectively. The cortex in stem, pedicel, and fruit is characterized by angular collenchyma cells and a distinct cambium layer. 6 compounds (quinic acid, fumaric acid, keracyanin chloride, cyanidin-3-O-glucoside, chlorogenic acid, hesperidin) were observed in samples. Leaf extract showed anticholinesterase activity. Leaf and flower extracts showed the highest % inhibition value on ABTS·+ and DPPH•. Leaf extract has the strongest antioxidant effect because it is rich in total phenolic contents. All extracts of F. tingitana were found generally effective against C. albicans. Stem extract was found effective against E. coli and flower extract was found more effective against S. enterica and C. albicans. Bacterial genotoxicity results showed that extracts did not have genotoxic activity on tester strains S. typhimurium and E. coli WP2uvrA. Thus, it revealed that extracts were genotoxic-ally safe at applied concentrations up to 3 mg/plate. Graphical abstract: [Figure not available: see fulltext.]
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2022Screening of antimicrobial, antioxidant, antidiabetic activities, anatomical and morphological properties of Colchicum speciosum Steven (Colchicaceae)
Karakaya, Songul; Göger, Gamze; Bona, Gülnur Ekşi; Yuca, Hafize; Aydın, Bilge; Tekman, Enes; Şahin, Aydan Acar; Pınar, Nur Münevver; Güvenalp, Zühal
Abstract: Colchicum speciosum Steven species is a perennial stemless plant. C. speciosum is a flowering herb native to mountainous regions of northern Turkey, the Caucasus, and northern Iran. It has been known as “Vargit, Acı Çiğdem, Güz Çiğdemi”. The present study reports the antimicrobial, antioxidant, α-amylase and α-glucosidase inhibitory activities of corm, leaf and flower methanol extracts, anatomical (light and electron microscopes) properties of root, corm, leaf, flowers and morphological characteristics of C. speciosum. Three different part of extracts C. speciosum were evaluated against E. coli ATCC 8739, S. aureus ATCC 6538, B. subtilis ATCC 19,659, C. albicans ATCC 10,231, C. krusei ATCC 14,243, and C. tropicalis ATCC 750. The most effective extract was found to be MeOH extract for corm and leaf against C. tropicalis ATCC 750 strain with MIC value 160 > µg/mL. It has been investigated first time anatomy of the tepal, ovary, anther, filament of C. speciosum. Leaf extract was the highest phenolic component (78.61842 µg GAE/ mg extract). As a result of DPPH• and ABTS•+ tests, it was determined that the leaf extract showed the best activity (IC50 = 6.568 μg/mL and IC50 = 3.243 μg/mL, respectively). Corm extract exhibited α-glucosidase inhibitory activity with an IC50 value of 21039 µg/mL. This is the first study of the in vitro antimicrobial, antioxidant, antidiabetic activities, detailed anatomical and morphological properties of C. speciosum. Hıghlıghts: • Antioxidant-antidiabetic-antimicrobial potential of Colchicum speciosum • Leaf extract had the highest phenolic component • The leaf got the highest DPPH• and ABTS•+ antioxidant potential • Corm extract exhibited α-glucosidase inhibitory activity • The most effective extract was found to be MeOH extract for corm and leaf against C. tropicalis • This is the first study of the in vitro antimicrobial, antioxidant, antidiabetic activities, detailed anatomical and morphological properties of C. speciosum Graphical abstract: [Figure not available: see fulltext.].
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2019Phenolic compounds from Cotinus coggygria Scop. With alpha glucosidase inhibition
Özbek, Hilal; Yuca, Hafize; Gözcü, Sefa; Dursunoğlu, Benan; Özenver, Nadire; Güvenalp, Zühal; Kazaz, Cavit; Önal, Mehmet; Demi̇Rezer, L. Ömür
Diabetes mellitus (DM), characterized by hyperglycemia, is one of the serious metabolic disorders. Inhibiting the key enzymes in digestion of dietary starch such as α-amylase and α-glucosidase, is one of the methods in treatment of DM. Antidiabetic drugs that inhibit carbohydrate-hydrolyzing enzymes have undesired side effects therefore, there is a huge interest in search of medicinal plants. Cotinus coggygria Scop. (Anacardiaceae) is used in Turkish folk medicine to treat DM. Therefore the bioguided fractionation and isolation studies were carried on C. coggygria. The ethyl acetate fraction possessed significative α-glucosidase inhibitory effect with 8.2 µg/mL IC50 value but no meaningful α-amylase inhibitory effect. Gallocatechin (1), methyl gallate (2), myricetin-3-O-α-rhamnoside (3), myricetin-3-O-β-galactoside (4) and 1, 2, 3, 4, 6-penta-O-galloyl-β-glucose (5) were isolated from this active fraction. Compound 5 showed significant α-glucosidase inhibitory activity with 1.5 µg/mL IC50 value, when compared to acarbose (IC50 = 3364.2 µg/mL) which used as positive control.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2019Qualitative and quantitative determination of the effective components of the plants in different herbal slimming products in Turkey by HPLC
Dursunoğlu, Benan; Yuca, Hafize; Gözcü, Sefa; Yilmaz, Bilal; Güvenalp, Zühal
Obesity is a serious disease that can be due to genetic and environmental reasons and is defined by the World Health Organization as abnormal or excessive fat accumulation that may impair health. There is an increasing trend towards herbal slimming products in obesity treatment. The quality control analysis of these products is important for public health. In this study, new, simple, and sensitive high performance liquid chromatography methods were developed for qualitative and quantitative determination of arbutin, hydroquinone, ursolic acid, chlorogenic acid, epigallocatechin gallate, epigallocatechin, epicatechin gallate, and catechin in eleven herbal slimming products in Turkey containing Camellia sinensis, Ilex paraguariensis, and Calluna vulgaris. The intra- and interday precisions, stated as the relative standard deviation, were less than 2% and accuracy, based on relative error, was less than 10%. The limits of detection and quantification for arbutin and hydroquinone were 0.80 and 2.40 µg/mL and for the other compounds were 0.30 and 0.90 µg/mL, respectively. The methods developed can be used for routine quality control analysis of these effective compounds in different herbal slimming products.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2018α-amylase and α-glucosidase inhibitory activities of the extracts and constituents of ferulago blancheana, F. Pachyloba and F. Trachycarpa roots
Karakaya, Songül; Özbek, Hilal; Gözcü, Sefa; Güvenalp, Zühal; Yuca, Hafize; Duman, Hayri; Kazaz, Cavit; Kiliç, Ceyda Sibel
Eleven coumarins named osthole (1), imperatorin (2), bergapten (3), prantschimgin (4), grandivitinol (5), suberosin (6), xanthotoxin (7), felamidin (8), marmesin (9), umbelliferone (10), ulopterol (11), and a sterol mixture consisted of stigmasterol (12), β-sitosterol (13) were isolated from the roots of Ferulago blancheana, F. pachyloba and F. trachycarpa through in vitro bioassay-guided fractionation processes. The extracts and bioactive compounds were evaluated for their α-amylase and α-glucosidase activities. Among the tested compounds, felamidin and suberosin showed significant α-glucosidase inhibitory activity with IC50 values of 0.4 and 0.9 mg/mL, respectively, when compared to the reference standard acarbose (IC50 = 4.9 mg/mL). Grandivitinol (IC50 = 20.0 mg/mL) had the lowest inhibitory effect. On the other hand, none of the tested extracts were found to be active on α-amylase inhibition. This is the first report on isolation, characterization of the bioactive compounds and evaluation the α-amylase and α-glucosidase inhibitory activities of these species.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2018Simultaneous determination of arbutin and hydroquinone in different herbal slimming products using gas chromatography-mass spectrometry; [Arbutin ve hidrokinonun farklı bitkisel zayıflama ürünlerinde gaz kromatografisi-kütle spektrometresi ile eşzamanlı belirlenmesi]
Dursunoğlu, Benan; Yuca, Hafize; Güvenalp, Zühal; Gözcü, Sefa; Yilmaz, Bilal
Objectives: The aim of our study was to develop a simple, precise, sensitive and specific method for the simultaneous determination of arbutin and hydroquinone in different herbal slimming products using GC-MS. Materials and Methods: The methanol and aqueous extracts of nine herbal slimming products in Turkey were evaluated for analysis of arbutin and hydroquinone using GC-MS method. Results: The retention times of arbutin and hydroquinone were found as 11.32 and 5.44 min, respectively. The linear ranges in this method were 5-500 ng/mL for arbutin and hydroquinone, respectively. The intra-and inter-day precisions, expressed as the relative standard deviation, were less than 1.94 and 2.73%, determined from quality control samples for arbutin and hydroquinone, and accuracy was within 1.13 and 2.56% in terms of relative error, respectively. The limit of detection and quantification were 0.555 and 1.665 ng/mL for arbutin, and 0.031 and 0.093 ng/mL for hydroquinone, respectively. Conclusion: The developed method can be used for routine quality control analysis of arbutin and hydroquinone in different herbal slimming products.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2018The α-amylase and α-glucosidase inhibitory activities of the dichloromethane extracts and constituents of Ferulago bracteata roots
Karakaya, Songül; Gözcü, Sefa; Güvenalp, Zühal; Özbek, Hilal; Yuca, Hafize; Dursunoğlu, Benan; Kazaz, Cavit; Kılıç, Ceyda Sibel
Context: Ferulago (Apiaceae) species have been used since ancient times for the treatment of intestinal worms, hemorrhoids, and as a tonic, digestive, aphrodisiac, or sedative, as well as in salads or as a spice due to their special odors. Objectives: This study reports the α-amylase and α-glucosidase inhibitory activities of dichloromethane extract and bioactive compounds isolated from Ferulago bracteata Boiss. & Hausskn. roots. Materials and methods: The isolated compounds obtained from dichloromethane extract of Ferulago bracteata roots through bioassay-guided fractionation and isolation process were evaluated for their in vitro α-amylase and α-glucosidase inhibitory activities at 5000-400 µg/mL concentrations. Compound structures were elucidated by detailed analyses (NMR and MS). Results: A new coumarin, peucedanol-2′-benzoate (1), along with nine known ones, osthole (2), imperatorin (3), bergapten (4), prantschimgin (5), grandivitinol (6), suberosin (7), xanthotoxin (8), felamidin (9), umbelliferone (10), and a sterol mixture consisted of stigmasterol (11), β-sitosterol (12) was isolated from the roots of F. bracteata. Felamidin and suberosin showed significant α-glucosidase inhibitory activity (IC50 0.42 and 0.89 mg/mL, respectively) when compared to the reference standard acarbose (IC50 4.95 mg/mL). However, none of the tested extracts were found to be active on α-amylase inhibition. Discussion and conclusions: The present study demonstrated that among the compounds isolated from CH2Cl2 fraction of F. bracteata roots, coumarins were determined as the main chemical constituents of this fraction. This is the first report on isolation and characterization of the bioactive compounds from root extracts of F. bracteata and on their α-amylase and α-glucosidase inhibitory activities.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2017α-Amylase and α-glucosidase inhibitory activities of the herbs of Artemisia dracunculus L. and its active constituents
Güvenalp, Zühal; Özbek, Hilal; Dursunoğlu, Benan; Yuca, Hafize; Gözcü, Sefa; Çil, Yeşim M.; Kazaz, Cavit; Kara, Kemalettin; Demirezer, Ömür L.
A new phenylpropanoid named 4-(1′,1′,2′,2′-tetramethylpropyl)-1,2-benzenediol (1) with a known phenylpropanoid: 3-(p-methoxyphenyl)-1,2-propanediol (2), a coumarin: herniarin (3), and a flavonol glycoside: rutin (4) were isolated from the aerial parts of Artemisia dracunculus L. Their structures were elucidated by detailed analyses of 1D and 2D nuclear magnetic resonance, IR, ESI–MS and HR–ESI–MS data. Methanol extract of aerial parts of the plant, different polarity fractions of methanol extract and the isolated compounds from these fractions were evaluated for their alpha amylase and alpha glucosidase inhibitory effects. Phenylpropanoids containing fraction had a significantly higher α-glucosidase inhibitory activity (90.4%) when compared with the standart compound acarbose (26.0%) at 1 mg/mL. However none of the tested extracts or compounds were found to be active on α-amylase inhibition.
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