Acylated oleanane-type triterpene oligoglycosides from the flower buds of Camellia sinensis var. assamica. Issue 5 (4th February 2015)

• Record Type: Journal Article
• Authors: Ohta, Tomoe; Nakamura, Seikou; Nakashima, Souichi; Matsumoto, Takahiro; Ogawa, Keiko; Fujimoto, Katsuyoshi; Fukaya, Masashi; Yoshikawa, Masayuki; Matsuda, Hisashi
• Is Part Of: Tetrahedron. Volume 71:Issue 5(2015)
• Page Start: 846
• Page End: 851
• Publication Date: 2015-02-04
• Subjects: Camellia sinensis var. assamica -- Theaceae -- Acylated oleanane-type triterpene -- Floraassamsaponin; Chemistry, Organic -- Periodicals; 547.005
• DOI: 10.1016/j.tet.2014.12.049
• Languages: English
• ISSNs: 0040-4020

Abstract

Abstract: Eight new acylated oleanane-type triterpene oligoglycosides, floraassamsaponins I, II, III, IV, V, VI, VII, and VIII, were isolated from the flower buds of Camellia sinensis var. assamica . The chemical structures of new constituents were characterized on the basis of chemical and physicochemical evidence. In the present study, floraassamsaponins I and II with sugar moiety at 28-position were obtained from the flower buds of C. sinensis var. assamica . In the past, acylated triterpene oligoglycosides with sugar moiety at 28-position have not been isolated from the flower buds of Camellia sinensis var. sinensis . This finding is interesting from the perspective of chemotaxonomy of Camellia plants. In addition, acylated oleanane-type triterpene saponins significantly inhibited the aggregation of Aβ42. Graphical abstract: