Dairy Chemistry Division, National Dairy Research Institute, Karnal, 132 001 Haryana India.
J Food Sci Technol. 2014 Oct;51(10):2727-33. doi: 10.1007/s13197-012-0781-1. Epub 2012 Aug 2.
The antioxidant activities of vidarikand (Pueraria tuberosa), shatavari (Asparagus racemosus) and ashwagandha (Withania somnifera) extracts (aqueous and ethanolic) were evaluated and compared with BHA using β-carotene bleaching assay, DPPH assay and Rancimat method. Phenolic contents of ethanolic extracts of herbs were high compared to their aqueous extracts. The ethanolic extracts showed more antioxidant activity (β-carotene-linoleic acid model system) than their aqueous counterparts. In DPPH system also, ethanolic extracts were superior to that of aqueous extracts. The ethanolic extracts of the herbs were more effective in preventing the development of the peroxide value and conjugated diene in ghee compared to their aqueous extracts. Ethanolic extracts of herbs showed the higher induction period as compared to their aqueous counter parts in the Rancimat. Antioxidant activity of the herbs decreased in the order vidarikand > ashwagandha > shatavari. Thus, the ethanolic extract of vidarikand was having the maximum antioxidant activity among all the herbs.
采用β-胡萝卜素漂白法、DPPH 法和 Rancimat 法评价并比较了 vidarikand（野葛）、shatavari（天门冬）和 ashwagandha（南非醉茄）提取物（水提物和醇提物）的抗氧化活性，并与 BHA 进行了比较。与水提物相比，这些草药的醇提物中的酚类含量更高。在β-胡萝卜素-亚油酸模型体系中，醇提物比水提物具有更强的抗氧化活性。在 DPPH 体系中也是如此，醇提物优于水提物。与水提物相比，这些草药的醇提物在防止黄油过氧化物值和共轭二烯形成方面更有效。与水提物相比，草药的醇提物在 Rancimat 中表现出更高的诱导期。在这些草药中，抗氧化活性按 vidarikand > ashwagandha > shatavari 的顺序降低。因此，vidarikand 的醇提物在所有草药中具有最强的抗氧化活性。
