关键词: 茶多酚, 棕榈酸酰氯, 碱性催化剂, 茶多酚棕榈酸酯

Abstract: The reaction products between the common Tea Polyphenols (TP) and propiomic anhydride or palmitoyl chloride or oleinoyl chloride in ethyl acetate solution (with alkaline catalyst) were evaluated by the antioxidative activity and solubility in refined edible oil, while the Tea Polyphenol Palmitate (TPP) showed the best result. The optimized synthesis conditions through further studies were as following : TP/ palmitoyl chloride/alkaline catalyst N=1:3.0:2.5 (mole), TP/ethyl acetate=1:40(W/V), 40℃, 8h. Under there conditions the light yellowish product was obtained. Its yield was 85.24%, the Rancimat (120℃) Induction period (IP) was 290min whereas control refined rapeseed oil was 154min. The Protection Index (PI) was 1.89. The transparency, turbidity value and diopter were showing no difference between the oil contained 200× 10-6 TPP and the oil control. It was preliminary concluded by Electric Spray Ionization Mass Spectrum (ESI-MS) that TPP contained the mono-ester, di-ester of several catechins, and some non-reactioned catechins and palmitic acid.

Key words: tea polyphenols, palmitoyl chloride, alkaline catalyst, tea polyphenol-palmitate