Optimization of Flavonoid Extraction from Ganoderma lucidum by Response Surface Methodology and Antioxidant Activities of Extracts
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摘要: 利用响应面法优化酶辅助提取灵芝黄酮工艺。在酶解温度、酶解时间和酶用量3个单因素的基础上,利用Box-Benhnken实验设计原理对复合酶的最佳配比进行优化。同时对灵芝提取液的抗氧化活性进行研究。结果表明:在80 min、50℃、pH值为5.0的酶解条件下,最佳酶比例为纤维素酶:果胶酶:中性蛋白酶=2.07:0.86:2.11。在该条件下,灵芝黄酮实际提取率可达0.75 mg·g-1;并且灵芝提取液对DPPH自由基和羟自由基有一定的清除能力,同时具有较强的还原力。Abstract: Enzyme addition in the hot water extraction of flavonoids from Ganoderma lucidum was investigated for improvements on the extraction efficiency and/or enhancement on the antioxidant activity of the extract. The single factor test and the response surface methodology were used to optimize the processing conditions. It was found that a maximized yield of flavonoids of 0.75 mg/g could be obtained with the use of a combination of cellulase, pectinase and neutral proteinase in the ratio of 2.07:0.86:2.11 for the extraction at pH 5.0 and 50oC for 80 min. The resulting extract exhibited a high reducing power as well as free radical scavenging activities on DPPH and hydroxyl free radicals.
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Key words:
- Ganoderma lucidum /
- enzyme combinations /
- response surface /
- flavonoids
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表 1 响应面试验设计
Table 1. Response surface experimental design
因素 水平 -1 0 1 X1纤维素酶/% 1.5 2 2.5 X2果胶酶/% 0.4 0.8 1.2 X3中性蛋白酶/% 1.5 2 2.5 表 2 响应面试验结果
Table 2. Response surface experimental results
试验
号X1
纤维素酶/%X2
果胶酶/%X3
中性蛋白酶/%黄酮得率
/(mg·g-1)1 1.50 0.80 2.50 0.4 2 2.00 0.80 2.00 0.63 3 1.50 1.20 2.00 0.36 4 2.00 0.80 2.00 0.72 5 2.50 1.20 2.00 0.4 6 2.00 1.20 1.50 0.46 7 2.00 0.80 2.00 0.67 8 2.00 0.80 2.00 0.7 9 2.50 0.40 2.00 0.31 10 2.50 0.80 1.50 0.45 11 1.50 0.80 1.50 0.3 12 1.50 0.40 2.00 0.24 13 2.00 1.20 2.50 0.5 14 2.00 0.40 2.50 0.41 15 2.00 0.40 1.50 0.32 16 2.50 0.80 2.50 0.53 17 2.00 0.80 2.00 0.69 表 3 黄酮得率回归系数及显著性检验
Table 3. Regression coefficient and significance test on flavone yield
变异来源 平方和 自由度 均方差 F值 P值 模型 0.3643 9 0.0405 26.01 0.0001** X1 0.0190 1 0.0190 12.22 0.0101* X2 0.0242 1 0.0242 15.55 0.0056** X3 0.0120 1 0.0120 7.72 0.0274* X1X2 0.0002 1 0.0002 0.14 0.7151 X1X3 0.0001 1 0.0001 0.06 0.8072 X2X3 0.0006 1 0.0006 0.40 0.5464 X12 0.1282 1 0.1282 82.38 <0.0001** X22 0.1246 1 0.1246 80.03 <0.0001** X32 0.0266 1 0.0266 17.10 0.0044** 残差 0.0109 7 0.0016 失拟项 0.0040 3 0.0013 0.77 0.5697 纯误差 0.0069 4 0.0017 总差 0.3752 16 R2=0.9710,RAdj2=0.9336,CV=8.33%,*P < 0.05,差异显著;**P < 0.01,差异极显著。 -
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