Catechin derivatives

Note The reagent can also be applied by first treating the chromatogram with an unacidified solution of vanillin and then exposing it to hydrochloric acid vapor [3, 9], Catechin derivatives should be evaluated rapidly (within 10 min), since the red coloration is not stable in daylight and fades relatively quickly [5, 9]. 

NAKANE H and ONO K (1990) Differential inhibitory effects of some catechin derivatives on the activities of human immunodeficiency virus reverse transcriptase and cellular deoyriboncleic and ribonucleic acid polymerases , Biochem, 29, 2841-5. 

Recently published literature described either the improvement of the strategies devoted to the synthesis of either catechins derivatives or oligomeric proanthocyanidins or the use of a synthetic program as a way to obtain... 

Tea exerts a relatively strong inhibitory potency for N-nitroso compound formation both in vitro and in humans. The active constituents may be related to their polyphenols content, especially the tea catechin derivatives [25]. 

Sarni-Manchado, P. and Cheynier, V., Study of noncovalent complexation between catechin derivatives and peptide by electrospray ionization-mass spectrometry (ESI-MS). J. Mass Spectrom. 37, 609, 2002. 

Kasai, S., S. Watanabe, J. Kawabata, S. Tahara, and J. Mizutani. 1992. Antimicrobial catechin derivatives of Agrimonia pilosa. Phytochemistry 31 787-789. 

Assignments for the 1H-NMR spectra of (+)-catechin derivatives are given in Table I. These data are based on results published earlier (5,12). The H-NMR spectra of the catechin reaction products were normalized by assigning 11 protons to the broad band of signals at 6.75 to 7.50 ppm. 

In recent years, many studies demonstrated that topical application or oral feeding of a polyphenolic fraction from tea extract, or catechin derivatives, had anticarcino-genic effects in animal skin and other organs. ... 

In the case of complex nutraceuticals such as green teas, variability of levels of claimed active compounds depend upon method of preparation of the infusion as well as choice of tea type. One survey of three teas and two preparations showed differences in theanine levels and wide variations in catechin derivatives, and another survey of three tea products showed similar wide variations in constituents. ... 

Berechnen Sie die Masse der in 1 L Teeaufguss enthaltenen Catechin-Derivate, fur die eine mittlere molare Masse von 450 g/mol angenommen wird. 

Catechinic derivatives Alkaline auto-oxidised catechinic acid Comps. (ACK A) Combretum micranihum HIV Vital penetration [12]... 

Apple flavan-3-ols include (-)-epicatechin, the main catechin derivative (31-129 mg/kg f.w.), (+)-catechin (0.5-27 mg/kg), (+)-gallocatechin and (-)-epigallocatechin [19]. Other studies have reported that these compounds in apple are in the range 34-165 mg/kg fw., depending on the cultivar [16]. 

Thus, the formation of the 4P-deuteriofisetinidol- and epifisetinidol derivatives (82) and (87) from the reduction of the profisetinidin permethylaryl ethers (68), (70), and (85) with Na(CN)BD3 in TEA, and of the enantiomer of compound (82) during reduction of the fisetinidol-(4p- 8)-catechin derivative (86), indicated that the deuterium ion is consistently delivered to C(4) of a protonated species of type (73 / 74) from the side opposite to the 2-aryl group of the C-ring. This... 

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