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不同压榨方式澳洲坚果油品质及抗氧化活性比较
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摘要
采用螺旋热榨、螺旋冷榨与液压压榨等方式制备了澳洲坚果油,运用气相色谱-质谱(GC-MS)联用技术对其脂肪酸组成进行了分析,并以核桃油为对照,对其色差值、质量指标与总酚含量进行了测定,同时,以核桃油与芦丁标准品为对照,研究了其对羟基自由基、超氧阴离子自由基、ABTS自由基的清除能力及还原力。结果表明:不同压榨方式澳洲坚果油中,液压压榨澳洲坚果油品质最佳,其评估色泽的L、a、b值分别为:99.78、-1.44、2.99;质量指标酸值、过氧化值分别为:0.6486 mg/g、0.4668 mmol/kg;含有5种不饱和脂肪酸,总含量为83.89%,其中油酸62.66%,棕榈油酸16.75%,亚油酸1.47%;总酚含量为679.11μg/m L。不同压榨方式澳洲坚果油的抗氧化活性与其浓度呈正相关,对羟基自由基与超氧阴离子自由基有较强的清除作用,具有一定的清除ABTS自由基的能力与还原力。其中液压压榨澳洲坚果油对羟基自由基(IC50 0.82 mg/m L)的清除能力与还原力(IC50 14.78 mg/m L)优于热榨、冷榨澳洲坚果油,低于芦丁标准品;对超氧阴离子自由基(IC50 0.029 mg/m L)的清除能力较强,相同浓度下优于冷榨澳洲坚果油与芦丁标准品,低于热榨澳洲坚果油与核桃油;对ABTS自由基(IC50 12.88 mg/m L)的清除能力热榨澳洲坚果油优于与核桃油,低于冷榨澳洲坚果油与芦丁标准品。相关性分析得出不同压榨方式澳洲坚果油与核桃油中的总酚含量与其清除羟基自由基(R=0.9519,P<0.01)、ABTS自由基(R=0.9107,P<0.01)的能力及还原力(R=0.9394,P<0.01)之间具有较好的相关性。
Macadamia(Macadamia ternifolia F. Muell.) oils were obtained by spiral hot press, spiral cold press and hydraulic press methods, the fatty acid composition were analyzed by GC and GC-MS. Values of chromatism, quality indexes and total phenolic contents of those were determined by comparing with walnut oil as a control. The scavenging abilities of hydroxyl free radical, superoxide anion free radical and ABTS free radical as well as reducing power of the different press-process method macadamia oils were investigated by comparing with walnut oil and rutin as the control. The results indicated the quality of hydraulic press macadamia oil was the best in the different press methods, L, a, b value of evaluating color were 99.78,-1.44, 2.99, respectively, acid value 0.6486 mg/g, peroxide number 0.4668 mmol/kg. Hydraulic press macadamia oil contained five unsaturated fatty acids, total content was 83.89%, in which with 62.66% linoleic acid, 16.75% palmitoleic acid and 1.47% octadecenoic acid and total phenolic content 679.11 μg/mL. The antioxidant activities of different press-process method macadamia oils had positive correlations with their concentrations. Different press-process method macadamia oils presented strong scavenging effects on the hydroxyl free radical and superoxide anion free radical, relative significant scavenging effect on the ABTS free radical and reducing power. The hydroxyl free radical(IC_(50) 0.82 mg/mL) scavenging ability and the reducing power(IC_(50) 14.78 mg/mL) of hydraulic press macadamia oil were stronger than those of spiral hot press macadamia oils and spiral cold press macadamia oils, and weaker than those of rutin. The result also proved that hydraulic press macadamia oil presented strong scavenging ability on the superoxide anion free radical(IC_(50) 0.029 mg/mL), and was stronger than that of spiral cold press macadamia oil and rutin, weaker than that of spiral hot press macadamia oil and walnut oil at the same concentration. In addition, the ABTS free radical(IC_(50) 12.88 mg/mL) scavenging ability ofhydraulic press macadamia oil was stronger than that of spiral hot press macadamia oil and walnut oil, weaker than that of spiral cold press macadamia oil and rutin. The correlation analysis showed that total phenolic contents in the different press-process method macadamia oils and walnut oil have better correlations with their hydroxyl and ABTS free radicals scavenging ability and reducing power with R value of 0.9519, 0.9107, 0.9394, respectively.
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