A high-efficiency and eco-friendly degumming process for ramie fibers
A high-efficiency and eco-friendly degumming process for ramie fibers
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一种高效、环保的苎麻纤维脱胶工艺
DOI：
10.1016/j.jclepro.2020.124217
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发表时间：
2020-12-10
影响因子：
11.1
通讯作者：
Yu, Long-jiang
中科院分区：
文献类型：
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作者：
Shu, Tong;Bai, Yun;Yu, Long-jiang
脱胶是苎麻纤维制备的关键步骤。然而，传统的化学脱胶工艺在高温下使用大量的碱，对环境造成了严峻的挑战。本研究从苎麻纤维中分离到一株胡萝卜果胶杆菌HG-49，并将其应用于苎麻纤维的脱胶。脱胶16 h后，胶质去除率可达82.16%，比目前报道的大多数方法都要高。对脱胶过程中细菌种群和群落结构变化的分析表明，菌株HG-49在所有时间点均为优势菌，在12 h时达到最大浓度2.17 × 10（9）CFU/mL。果胶酶、甘露聚糖酶和木聚糖酶在10-12 h时的最大酶活分别为110.89、39.89和32.17 U/mL。脱胶后苎麻纤维残胶率降至1.85%，束断裂强度和白度分别达到5.03cN/dtex和52。这些值超过了中国纺织品标准的一级标准。扫描电子显微镜（SEM）和衰减全反射傅里叶变换红外光谱（ATR FT-IR）分析进一步证实了该方法的优异脱胶效果。对菌株HG-49进行了全基因组测序，发现了28个脱胶酶基因，说明该菌株具有高效脱胶能力。此外，由于该方法放弃了酸的使用，大大减少了碱的消耗，因此是生态友好的。该研究为苎麻纺织工业提供了一种有前途的清洁脱胶方法。(C)2020爱思唯尔有限公司保留所有权利。
Degumming is the most critical step in the preparation of ramie fibers for textile application. However, the traditional chemical degumming process, which uses large amounts of alkali at high temperature, has been a severe challenge to the environment. In this study, a bacterial strain Pectobacterium carotovorum HG-49, was isolated and successfully applied to the degumming of ramie fibers at an industrial scale. The gum removal ratio can reach 82.16% within 16 h of degumming, which is more efficient than most reported methods. Analyses of changes in bacterial populations and community structures over the degumming process showed that strain HG-49 is the dominant bacteria at all time points with a lmaximum concentration of 2.17 x 10(9) CFU/mL at 12 h. The maximum activities of pectinase, mannanase, and xylanase reached 110.89, 39.89, and 32.17 U/mL at 10-12 h, respectively. The residual gum content of refined ramie fibers decreased to 1.85% after degumming, and their bundle breaking tenacity and whiteness reached 5.03 cN/dtex and 52, respectively. These values exceed the first-class standards of China textile criteria. Scanning Electron Microscopy (SEM) and Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR FT-IR) analysis further confirmed the excellent degumming effects of the proposed method. The whole genome sequencing of strain HG-49 was completed, and 28 degumming enzyme genes were found, which explains its high-efficiency degumming abilities. Moreover, because the method abandons the use of acid and greatly reduces alkali consumption, it is eco-friendly. This study provides a promising cleaner degumming method for the ramie textile industry. (C) 2020 Elsevier Ltd. All rights reserved.