建立了同时测定特丁基对苯二酚(TBHQ)、丁基羟基茴香醚(BHA)和二丁基羟基对甲酚(BHT)的高效液相色谱法。考察了流动相组成、柱温等因素对分析效率的影响。样品经甲醇提取后,以E-clipse plus C18(250mm×4.6mm,5μm)色谱柱为分析柱,0...建立了同时测定特丁基对苯二酚(TBHQ)、丁基羟基茴香醚(BHA)和二丁基羟基对甲酚(BHT)的高效液相色谱法。考察了流动相组成、柱温等因素对分析效率的影响。样品经甲醇提取后,以E-clipse plus C18(250mm×4.6mm,5μm)色谱柱为分析柱,0.02mmol/L乙酸铵水溶液-甲醇为流动相,线性梯度淋洗,紫外二极管阵列检测器检测,波长280nm。结果表明:TBHQ、BHA与BHT在0.5～20mg/L范围内有良好的线性关系,方法的检出限(S/N=3)分别为0.03,0.03和0.05mg/kg,加标回收率为83.45%～108.42%,相对标准偏差不大于12.79%。展开更多
To determine the significance of germination on phytochemical constituents and non-enzymatic antioxidant activ- ities of Ceiba pentandra seed extracts. Phytochemicals and antioxidant activities of raw and germinating ...To determine the significance of germination on phytochemical constituents and non-enzymatic antioxidant activ- ities of Ceiba pentandra seed extracts. Phytochemicals and antioxidant activities of raw and germinating seeds of Ceiba pentandra were estimated by different methods. The levels of phytochemical constituents were influenced by germination and increased except alkaloids and tannins, which were decreased significantly during germination. Among non-enzymatic antioxidants like DPPH, FRAP, reducing assay and hydroxyl radical scavenging activity all showed improved activity compared with non-germinating seeds. This may be due to various reactive oxygen species （ROS） that were generated as by-products of metabolism during germination. This group of ROS included superoxide radicals （O2）, hydrogen peroxide radicals （HzOz） and hydroxyl radicals （OH）. The formation of these oxygen radicals resulted in the accumulation of lipid hydroperoxides by radical chain oxidation via phospholipids peroxy radicals within membranes. Therefore, it was hypothesized that this could be related to the increase of anti- oxidant activity in large unilamellar vesicles observed in germinated seeds. The implication of this study is that the Ceiba pentandra seeds as natural antioxidant agents and put forward the possibility of employing for therapeutic potential.展开更多
文摘建立了同时测定特丁基对苯二酚(TBHQ)、丁基羟基茴香醚(BHA)和二丁基羟基对甲酚(BHT)的高效液相色谱法。考察了流动相组成、柱温等因素对分析效率的影响。样品经甲醇提取后,以E-clipse plus C18(250mm×4.6mm,5μm)色谱柱为分析柱,0.02mmol/L乙酸铵水溶液-甲醇为流动相,线性梯度淋洗,紫外二极管阵列检测器检测,波长280nm。结果表明:TBHQ、BHA与BHT在0.5～20mg/L范围内有良好的线性关系,方法的检出限(S/N=3)分别为0.03,0.03和0.05mg/kg,加标回收率为83.45%～108.42%,相对标准偏差不大于12.79%。
文摘To determine the significance of germination on phytochemical constituents and non-enzymatic antioxidant activ- ities of Ceiba pentandra seed extracts. Phytochemicals and antioxidant activities of raw and germinating seeds of Ceiba pentandra were estimated by different methods. The levels of phytochemical constituents were influenced by germination and increased except alkaloids and tannins, which were decreased significantly during germination. Among non-enzymatic antioxidants like DPPH, FRAP, reducing assay and hydroxyl radical scavenging activity all showed improved activity compared with non-germinating seeds. This may be due to various reactive oxygen species （ROS） that were generated as by-products of metabolism during germination. This group of ROS included superoxide radicals （O2）, hydrogen peroxide radicals （HzOz） and hydroxyl radicals （OH）. The formation of these oxygen radicals resulted in the accumulation of lipid hydroperoxides by radical chain oxidation via phospholipids peroxy radicals within membranes. Therefore, it was hypothesized that this could be related to the increase of anti- oxidant activity in large unilamellar vesicles observed in germinated seeds. The implication of this study is that the Ceiba pentandra seeds as natural antioxidant agents and put forward the possibility of employing for therapeutic potential.
