New triterpenoids and other constituents from a special microbial-fermented tea-Fuzhuan brick tea

J Agric Food Chem. 2010 Apr 28;58(8):4945-50. doi: 10.1021/jf9043524.

Abstract

Fuzhuan brick tea, a special microbial-fermented tea prepared from the leaves of Camellia sinensis var. sinensis, is a traditional beverage used in China throughout history. Phytochemical investigation of this material led to the identification of three new triterpenoids, 3beta,6alpha,13beta-trihydroxyolean-7-one (1), 3beta-acetoxy-6alpha,13beta-dihydroxyolean-7-one (2), and 3beta-O-(8-hydroxyoctanoyl)-12-oleanene (3), together with 11 known compounds, friedelin (4), beta-amyrone (5), beta-amyrin (6), alpha-spinasterone (7), alpha-spinasterol (8), 22,23-dihydro-alpha-spinasterone (9), 22,23-dihydro-alpha-spinasterol (10), alpha-phytol (11), alpha-tocopherol (12), alpha-tocoquinone (13), and caffeine (14). The structures of 1-13 were determined by spectroscopic and chemical methods. Compounds 1 and 2 are the first two examples of triterpenoids possessing a 6-hydroxy-7-one function. All of the compounds, except 6, 8, 10, 11, and 14, were isolated from tea and Camellia spp. for the first time. The antibacterial activities of 1 were assessed against some enteric pathogenic microbes. Compound 1 showed no cytotoxic activity against A-549, Bel-7402, and HCT-8 cell lines.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacteria / classification
  • Bacteria / drug effects
  • Fermentation*
  • Magnetic Resonance Spectroscopy
  • Microbial Sensitivity Tests
  • Spectrometry, Mass, Electrospray Ionization
  • Tea / chemistry*
  • Triterpenes / analysis*
  • Triterpenes / pharmacology

Substances

  • Tea
  • Triterpenes