International Joint Research Laboratory for Textile and Fiber Bioprocesses, Jiangnan University, Wuxi, China.
Institute for Environmental Biotechnology, Department for Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences, Vienna (BOKU), Tulln an der Donau, Austria.
PLoS One. 2018 Jun 1;13(6):e0197537. doi: 10.1371/journal.pone.0197537. eCollection 2018.
Ultrasound-assisted extraction of hemicellulose and phenolic compounds from bamboo bast fibre powder was investigated. The effect of ultrasonic probe depth and power input parameters on the type and amount of products extracted was assessed. The results of input energy and radical formation correlated with the calculated values for the anti-nodal point (λ/4; 16.85 mm, maximum amplitude) of the ultrasonic wave in aqueous medium. Ultrasonic treatment at optimum probe depth of 15 mm improve 2.6-fold the extraction efficiencies of hemicellulose and phenolic lignin compounds from bamboo bast fibre powder. LC-Ms-Tof (liquid chromatography-mass spectrometry-time of flight) analysis indicated that ultrasound led to the extraction of coniferyl alcohol, sinapyl alcohol, vanillic acid, cellobiose, in contrast to boiling water extraction only. At optimized conditions, ultrasound caused the formation of radicals confirmed by the presence of (+)-pinoresinol which resulted from the radical coupling of coniferyl alcohol. Ultrasounds revealed to be an efficient methodology for the extraction of hemicellulosic and phenolic compounds from woody bamboo without the addition of harmful solvents.
超声辅助提取竹黄麻纤维粉末中的半纤维素和酚类化合物。评估了超声探头深度和功率输入参数对提取产物类型和数量的影响。输入能量和自由基形成的结果与在水介质中超声波的节点反相点（λ/4；16.85mm，最大振幅）的计算值相关。在最佳探头深度 15mm 下进行超声处理，可将竹黄麻纤维粉末中半纤维素和酚类木质素化合物的提取效率提高 2.6 倍。LC-MS-Tof（液相色谱-质谱-飞行时间）分析表明，与仅沸水提取相比，超声提取出了松柏醇、丁香醇、香草酸、纤维二糖。在优化条件下，超声处理会形成自由基，这可以通过（+）-松脂醇的存在来证实，（+）-松脂醇是由松柏醇的自由基偶联形成的。超声处理是一种从木质竹材中提取半纤维素和酚类化合物的有效方法，无需添加有害溶剂。
