• Home
  • About
  • Policies
  • Contact
    • English
    • Türkçe
  • English 
    • English
    • Türkçe
  • Login
Advanced Search
View Item 
  •   Home
  • Tüm Akademik Yayınlar
  • Yayınlar - Eserler
  • View Item
  •   Home
  • Tüm Akademik Yayınlar
  • Yayınlar - Eserler
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Antioxidant and Tyrosinase Inhibitory Activities of Flavonoids from Trifolium nigrescens Subsp petrisavi

Thumbnail
Date
2013-12-25
Author
Demirkiran, Ozlem
Sabudak, Temine
Ozturk, Mehmet
Topcu, GÜLAÇTI
Advisor
Type
Article
Metadata
Show full item record
Abstract
Trifolium nigrescens was researched for its chemical constituents for the first time. Bioassay-guided isolation of the EtOAc extract from the leaves of T. nigrescens resulted in the purification of a new biflavone, 4-,5,5 -,7,7 --pentahydroxy-3-,3--dimethoxy-3-O-beta-D-glucosyl-3 -,4--O-biflavone (1) along with eleven known compounds consisting of three phenolics (2-4), and eight flavonoid glycosides (5-12). Their structures were determined by extensive ID and 2D NMR, and MS data analyses. The isolated compounds were evaluated for their antioxidant activity and inhibitory activity on mushroom tyrosinase. Highly potent inhibitions Were found by compounds 7 (IC50 = 0.38 mM), 8 (IC50 = 0.19 mM), and 12 (IC50 = 0.26 mM) when compared with standard tyrosinase inhibitors kojic acid (IC50 = 0.67 mM) and L-mimosine (IC50 = 0.64 mM). The antioxidative effect of the isolated compounds and the extracts were determined by using, beta-carotene-linoleic acid, DPPH center dot scavenging, ABTS(+center dot) scavenging, superoxide scavenging, and CUPRAC assays. The experimental findings indicated that all the compounds demonstrated activity in all antioxidant activity tests employed except for the compounds 2-6. Compounds 2-6 showed moderate activity only in ABTS(+center dot) scavenging assay. The new compound 1 exhibited better activity than standard alpha-tocopherol in DPPH center dot scavenging, and ABTS(+center dot) scavenging assays. The results show that T. nigrescens can be regarded as a potential source of antioxidant compounds and tyrosinase inhibitors of significance in both the pharmaceutical and food industries.
Subject
Demirkiran O., Sabudak T., Ozturk M., Topcu G., -Antioxidant and Tyrosinase Inhibitory Activities of Flavonoids from Trifolium nigrescens Subsp petrisavi-, JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, cilt.61, ss.12598-12603, 2013
URI
https://hdl.handle.net/20.500.12645/2056
Collections
  • Eczacılık Fakültesi
  • PubMed İndeksli Yayın Koleksiyonu
  • Scopus İndeksli Yayınlar Koleksiyonu
  • WoS İndeksli Yayınlar Koleksiyonu
  • Yayınlar - Eserler

BEZMIALEM VAKIF UNIVERSITY

About us |Policies | Library | Contact us | Send Feedback | Sitemap | Admin

Bezmialem Vakıf Üniversitesi, Adnan Menderes Bulvarı Vatan Caddesi 34093 Fatih, İstanbul / TURKEY
Copyright © Bezmialem Vakıf Üniversitesi

Creative Commons Lisansı
Bezmialem Institutional Repository, Creative Commons Alıntı-GayriTicari-Türetilemez 4.0 Uluslararası Lisansı ile lisanslanmıştır.

OpenAccess@BVU

Support by  UNIREPOS






sherpa/romeo

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsTypeLanguageRightsAdvisorInstitution AuthorThis CollectionBy Issue DateAuthorsTitlesSubjectsTypeLanguageRightsAdvisorInstitution Author

My Account

LoginRegister

BEZMIALEM VAKIF UNIVERSITY

About us |Policies | Library | Contact us | Send Feedback | Sitemap | Admin

Bezmialem Vakıf Üniversitesi, Adnan Menderes Bulvarı Vatan Caddesi 34093 Fatih, İstanbul / TURKEY
Copyright © Bezmialem Vakıf Üniversitesi

Creative Commons Lisansı
Bezmialem Institutional Repository, Creative Commons Alıntı-GayriTicari-Türetilemez 4.0 Uluslararası Lisansı ile lisanslanmıştır.

OpenAccess@BVU

Support by  UNIREPOS