Process Optimization and Antioxidant Activity of Polyphenols Extracted from Leaves of Juglans mandshurica Maxim
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摘要: 采用核桃楸叶为原料,超声波辅助提取和紫外分光光度计对其多酚类物质进行含量测定。在单因素试验基础上,通过响应面法优化了核桃楸叶多酚类物质的提取工艺,得出核桃楸叶多酚类物质最佳提取条件为:乙醇体积分数70%,液料比15:1,超声时间30 min,超声温度60℃。核桃楸叶多酚类物质对羟基自由基、亚硝酸根离子、超氧阴离子、DPPH自由基有较强的清除能力,其对4种自由基的清除能力强弱顺序为DPPH自由基>超氧阴离子>羟基自由基>亚硝酸根离子,核桃楸叶多酚类物质对4种自由基的清除能力整体强于化学防腐剂苯甲酸,这表明核桃楸叶多酚类物质具有较强的抗氧化活性,是一种天然的抗氧化剂,为下一步研究多酚类物质的抗氧化性提供了依据。Abstract: Polyphenols were extracted from the leaves of Juglans mandshurica Maxim using an ultrasound-assisted process. Polyphenol content was determined by UV spectrophotometry. The extraction was optimized by a response surface experiment to arrive at the conditions including 70% by volume of ethanol as solvent, a solvent:solid ratio of 15:1, and an ultrasonic treatment of 30 min at 60℃. The polyphenol extract showed an excellent capacity in scavenging free radicals and ions in the order of DPPH radical > superoxide anion > hydroxyl radical > nitrite ion. It was more powerful than what the chemical preservative, such as benzoic acid, can provide. Thus, the polyphenols extracted from leaves of J. mandshurica by the current method could be a new natural antioxidant for potential applications.
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表 1 BBD试验设计因素与水平
Table 1. Levels and factors of Box-Behnken design
水平 酒精体积分数/% 液料比/(mL:g) 超声时间/min -1 60 10:1 20 0 70 15:1 30 1 80 20:1 40 表 2 BBD试验设计结果
Table 2. Results of data analysis on Box-Behnken experiment
序号 乙醇体积分数/% 液料比/(mL:g) 超声时间/min 多酚提取率/% 1 60 15:1 20 1.98 2 70 20:1 20 1.81 3 70 15:1 30 3.46 4 70 20:1 40 2.24 5 80 10:1 30 1.75 6 80 20:1 30 1.61 7 60 10:1 30 1.89 8 70 10:1 20 1.71 9 80 15:1 20 1.59 10 70 15:1 30 3.46 11 80 15:1 40 1.66 12 70 15:1 30 3.46 13 60 20:1 30 2.21 14 70 15:1 30 3.46 15 70 10:1 40 1.65 16 60 15:1 40 2.03 17 70 15:1 30 3.46 表 3 多酚提取物对羟基自由基、亚硝酸根离子、超氧阴离子和DPPH自由基的清除率
Table 3. Scavenging capacities of polyphenol extract on hydroxyl radicals, nitrite ions, super-oxide anions and DPPH free radicals
样品浓度/(μg·mL-1) 羟基自由基清除率/% 亚硝酸根离子清除率/% 超氧阴离子清除率/% DPPH自由基清除率/% 提取多酚 苯甲酸 抗坏血酸 提取多酚 苯甲酸 抗坏血酸 提取多酚 苯甲酸 抗坏血酸 提取多酚 苯甲酸 抗坏血酸 4 19.9 15.7 29.4 19.6 15.7 29.4 23.2 20.4 30.7 79.6 71.1 83.3 8 33.4 21.1 42.1 29.7 23.2 38.5 41.4 29.0 48.5 84.5 76.5 89.4 12 39.2 32.7 61.9 36.9 29.7 49.1 58.9 32.7 65.4 88.2 79.2 94.1 16 54.3 38.3 68.3 49.1 36.4 57.5 76.1 39.3 81.1 93.7 82.6 99.3 20 62.4 44.7 78.6 58.9 44.2 66.3 89.7 45.2 90.2 96.9 86.3 99.9 -
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