Journal of Tea Science Research, 2024, Vol.14, No.1, 52-56 http://hortherbpublisher.com/index.php/jtsr 53 Figure 1 Assam tea leaves, powder and extract (A), the studying catechins and cafeine (B) and catechins profles of the extract (C) Figure 5 presents the stability of Assam tea extract (ATE) after six months of storage under different conditions. The results indicate that the color difference (ΔE) of ATE at different temperatures (4°C, room temperature, and 45°C) did not exceed the visually detectable range, demonstrating its physicochemical stability (Figure 5A). HPLC analysis showed that although the catechin content decreased after six months, the relative change did not exceed 20%, remaining within the stability range for cosmetics (Figure 5B). These results suggest that ATE has good chemical stability under recommended storage conditions, making it suitable for use in actual cosmetic and health products.
RkJQdWJsaXNoZXIy MjQ4ODYzNA==