Effects of different extraction methods on polysaccharide content and antioxidant activity of northern Ban-Lan-Gen
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摘要: 考察不同提取方式对北板蓝根多糖含量及抗氧化活性的影响. 采用常规回流提取法和超声波辅助回流法提取北板蓝根多糖,通过苯酚−硫酸分光光度法测定总多糖含量,采用二苯代苦味酰基自由基(2,2−diphenyl−1−picryhydrazyl, DPPH·)和2,2−联氮−二(3−乙基−苯并噻唑−6−磺酸)二铵盐自由基 (ABTS+·)清除实验评价体外抗氧化作用. 结果表明,超声波辅助回流法提取的多糖得率为40.07%,显著高于常规回流提取法 (13.42%). 苯酚−硫酸法的精密度高,重复性、稳定性和加样回收率良好,可用于不同提取方法制备的北板蓝根总多糖含量研究. 超声波辅助回流法提取的多糖含量比常规回流提取法提高22.3%,对DPPH 自由基和ABTS+自由基的清除作用显著优于常规回流提取法. 研究结果可为超声波技术在北板蓝根多糖提取中的应用提供参考.Abstract: The effects of different extraction methods on polysaccharide content and antioxidant activity of northern Ban-Lan-Gen were investigated. The polysaccharide of northern Ban-Lan-Gen was extracted by conventional reflux extraction method and ultrasonic assisted reflux extraction method. The total polysaccharide content was determined by phenol-sulfuric acid spectrophotometry. DPPH free radical and ABTS+ free radical scavenging assays were used to evaluate their antioxidant activity in vitro. The results show that the yield of polysaccharide extracted by ultrasonic assisted reflux extraction method was 40.07%, which was significantly higher than that by conventional reflux extraction method (13.42%). The phenol-sulfuric acid method has high precision, repeatability, stability and good recovery, which can be used to study the polysaccharide content of northern Ban-Lan-Gen prepared by different extraction methods. The polysaccharide content of ultrasonic assisted reflux extraction method was 22.3% higher than that of conventional reflux extraction method, and the scavenging effects of DPPH· and ABTS+· was significantly better than that of conventional reflux extraction method. The results provide a reference for the application of ultrasonic technology in the extraction of polysaccharide of northern Ban-Lan-Gen.
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表 1 加样回收率实验结果
Table 1. Results of recovery rate
样品中多糖
质量/μg加入对照
品质量/μg加样回
收率/%平均加样
回收率/%RSD/% 18.67 15 100.607 18.59 20 99.318 99.81 0.701 18.30 25 99.492 表 2 北板蓝根多糖含量测定
Table 2. Determination of polysaccharide content obtained from northern Ban-Lan-Gen
提取方式 序号 浓度/(μg•mL−1) 多糖含量/% (平均值 ± 标准差)/% 常规回流法 1 18.50 4.63 4.63 ± 0.32 2 18.59 4.65 3 18.48 4.62 超声波辅助
回流法1 24.07 6.02 5.96 ± 1.11 2 23.56 5.89 3 23.91 5.98 -
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