海藻油高效复合抗氧化剂的筛选及稳定性研究
Study on screening of efficient multiple antioxidants and stability of algal oil
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摘要: 为筛选适宜的海藻油高效复合抗氧化剂,以过氧化值（POV）和酸价（AV）为指标,通过L9（34）正交实验,从鼠尾草酸、天然维生素E、L-抗坏血酸棕榈酸酯中优选海藻油复合抗氧化剂;采用加速氧化实验比较优化组和对照组海藻油的氧化稳定性。结果表明,抗氧化剂鼠尾草酸、天然维生素E、L-抗坏血酸棕榈酸酯能明显增强海藻油的氧化稳定性,影响顺序为:L-抗坏血酸棕榈酸酯>鼠尾草酸>天然维生素E,最佳抗氧化剂组合为0.7‰鼠尾草酸+0.3‰天然维生素E+0.2‰L-抗坏血酸棕榈酸酯;稳定性实验结果显示,优化抗氧化剂组合处理的海藻油样品的稳定度明显比对照组高,达到21～22d,相当于常温下21～22个月的保质期,而对照组在常温下的保质期仅为10～11个月;利用外推法计算常温（20℃）下海藻油的氧化诱导时间,优化组样品为49980h,而对照组样品仅为9850h。Abstract: With the POV and AV as measure indicators, three parameters including Carnosic acid, nature Vitamin E, L-ascorbyl palmitate were optimized using L9 (34) arthogonal test for achieving maximum antioxidative effect for algal oil.And then the oxidative stability of algal oil with or without antioxidants were compared by accelerated oxidation test.A combination of 0.7‰ Carnosic acid, 0.3‰ nature Vitamin E, 0.2‰ L-ascorbyl palmitate showed most effective for antioxidation in L9 (34) arthogonal test, the effective order of antioxidants was L-ascorbyl palmitate>Carnosic acid>nature Vitamin E.Rancimat test could determine the oxidative stability and then forecast shelf life of algal oil effectively.Stability test estabilished that the self-life of algal oil treated with multiple antioxidants could reach 21～22 mos while the contrasted one only 10～11 mos.The oxidative induction time of algal oils with or without multiple antioxidants were 49980 and 9850h respectively which calculated through extrapolated method.
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