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Tea is the most popular daily drink consumed globally, with a high concentration of caffeine and polyphenols. In this study, the effects of ultrasonic‐assisted extraction and quantification of caffeine and polyphenols from green tea were investigated and optimized using 23‐full factorial design and high‐performance thin‐layer chromatography. Three parameters were optimized to maximize the concentration...
Asparagus racemosus Willd. is widely used to combat various diseases owing to its medicinal properties. In this study, arial parts of A. racemosus were investigated for their total phenolic content, total flavonoid content and antioxidative potential. A high‐performance thin‐layer chromatography (HPTLC) method combined with effect‐directed‐analysis was also developed to screen the antioxidant effects...
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