Comparison of NO-scavenging and NO-Suppressing Activities of Several Herbal Teas with those of Green Tea
【摘要】：正Oxidative stress caused by the production of excess nitric oxide (NO) during infection or inflammation has been implicated in the pathogenesis of several diseases, including cancer, diabetes and renal disease. Accordingly, the scavenging of NO radical or/and suppression of NO production by mitogen-activated cells may be promising indicators in screening healthy food. In this work, the NO-scavenging and NO-suppressing activities of numerous herbal teas were determined, and compared with those of green tea. All of the tested herbal teas revealed NO-scavenging and NO-suppressing activities. The NO-scavenging activity of herbal teas can be ranked by the IC50, the concentration of the tested herbal tea required to quench 50% of NO radicals released by sodium nitroprusside. The activities follow the order of green tea rosemary, sweet osmanthus, rose and lavender jasmine, lemongrass and daisy. The NO-suppressing activity was evaluated based on the suppressing effect of herbal teas on the production of NO by LPS-activated RAW 264.7 macrophages. Experimental results indicated that green tea and rosemary had IC50 values of lower than 500 g/mL, and was proven to be a good NO-suppressor, whereas lavender; sweet osmanthus; lemongrass; rose; daisy, and jasmine had IC50 values that exceeded 500 g/mL, and were classified as rather poor NO-suppressors. In conclusion, consumption of herbal teas promotes the NO-scavenging and NO-suppressing activities of one's diet, even though their activities were weaker than that of green tea.