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171303240

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單因素實(shí)驗(yàn)結(jié)果表明：MRPs清除DPPH·自由基的能力隨反應(yīng)溫度和反應(yīng)時間的增加而增加，其清除·OH自由基的能力隨反應(yīng)時間的增加而減小；其還原能力和清除·OH自由基隨反應(yīng)時間和反應(yīng)溫度的增加先增加后減小。正交試驗(yàn)結(jié)果表明：在115℃、濃度0.5 mg/ml、反應(yīng)時間90min時制備的MRPs其清除DPPH·的能力最大為88.73%；在濃度0.6 mg/ml，反應(yīng)時間40min，溫度65℃時MRPs的還原能力最大為A700nm=1.684；在反應(yīng)時間10min，濃度0.6 mg/ml，溫度65℃MRPs的清除·OH的能力最大為98.72%。不同的反應(yīng)條件下制備的MRPs均表現(xiàn)出了很高的抗氧化活性，相同濃度的MRPs比Vc和TBHQ抗氧化效果更好，但其抗氧化能力并不完全依賴于產(chǎn)物的褐變程度。

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1樓 2011-08-17 21:59:51

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Carena

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171303240(金幣+60, 翻譯EPI+1): 非常感謝 2011-08-17 23:24:35
sltmac(金幣+1): 追加獎勵 2011-08-20 11:45:43

The results of the single factor experiments showed that MRPs’ ability to scavenge the DPPH free radicals increased as the the reaction temperature and reaction time did, but its ability to scavenge the OH free radicals decreased with the increase of the reaction time. Meanwhile, the reductive ability of MRPs and its ability of scavenging the OH free radicals first increased and then decreased as a result of the increase of the reaction temperature and reaction time. The results of the orthogonal experiments indicated that the highest ability of MRPs, which was prepared with the concentration of 0.5 mg / ml for 90 min at 115℃, scavenging DPPH was 88.73%, its highest reductive ability prepared with the concentration of 0.6 mg / ml for 40 min at 65℃ was A700nm=1.684, and its highest ability to scavenge OH with the concentration of 0.6 mg / ml for 10 min at 65℃ was 98.72%. These results presented that there was always a high antioxidant activity of MRPs in spite of different reaction conditions. With the same concentration, MRPs had got better antioxidant effect than that of Vc and TBHQ. Nevertheless, the antioxidant capacity of MRPs did not entitely depend on the browning degree of the products.

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2樓2011-08-17 23:18:23

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