Page 155 - 《精细化工》2020年第9期

第 9 期 崔 莹，等: 一步法快速提取浅色甘蔗渣木质素的工艺优化 ·1869·

图 4 BL1 和 BL2 的 2D-HSQCNMR 谱图
Fig. 4 2D-HSQCNMR spectra of BL1 and BL2

可知，BL1 中 G、S、H 的摩尔分数分别为 57.7%、 antioxidant and cytotoxic effects of lignins from different sources[J].
Bioresource Technology, 2008, 99(14): 6683-6687.
17.1%、25.2%，而 BL2 中 G、S、H 的摩尔分数分
[6] TORTORA M, CAVALIERI F, MOSESSO P, et al. Ultrasound driven
别为 72.5%、16.9%、10.6%。比较分析可知，两者 assembly of lignin into microcapsules for storage and delivery of
紫丁香基含量相近，BL1 样品中含有较少的愈创木 hydrophobic molecules[J]. Biomacromolecules, 2014, 15(5): 1634-1643.
[7] BARAPATRE A, MEENA A S, MEKALA S, et al. In vitro
基和较多的对羟基苯基。由于紫丁香基含有两个甲 evaluation of antioxidant and cytotoxic activities of lignin fractions
氧基，愈创木基含有一个甲氧基，而对羟基苯基中 extracted from acacia nilotica[J]. International Journal of Biological
Macromolecules, 2016, 86: 443-453.
不含甲氧基，因此，BL2 结构中甲氧基含量多于 [8] QIAN Y, QIU X Q, ZHU S P. Lignin: A nature-inspired sun blocker
BL1。由文献[17]可知，甲氧基是一种助色基团，其 for broad-spectrum sunscreens[J]. Green Chemistry, 2015, 17(1):
320-324.
含量多会使木质素颜色加深。另外，P-CA 结构中的 [9] QIAN Y, QIU X Q, ZHU S P. Sunscreen performance of lignin from
羰基同样会与芳香环形成共轭结构，从而加深木质 different technical resources and their general synergistic effect with
素颜色，而 BL2 中 P-CA 结构信号也显著强于 BL1。 synthetic sunscreens[J]. ACS Sustainable Chemistry & Engineering,
2016, 4(7): 4029-4035.
综上所述，在实验优化条件下提取的样品 BL1 结构 [10] QIAN Y, ZHONG X W, LI Y, et al. Fabrication of uniform lignin
中较少的羰基和甲氧基含量使得木质素白度增大。 colloidal spheres for developing natural broad-spectrum sunscreens
with high sun protection factor[J]. Industrial Crops and Products,
2017, 101: 54-60.
3 结论 [11] WU Y, QIAN Y, LOU H M, et al. Enhancing the broad-spectrum
adsorption of lignin through methoxyl activation, grafting modification,
利用 p-TsOH 一步快速分离提取 BL，条件温和、 and reverse self-assembly[J]. ACS Sustainable Chemistry & Engineering,
2019, 7(19): 15966-15973.
反应时间短、操作简单且无污染。在单因素实验基
[12] WANG J Y, DENG Y H, QIAN Y, et al. Reduction of lignin color via
础上，利用响应曲面设计法对提取工艺进行优化， one-step UV irradiation[J]. Green Chemistry, 2015, 18(3): 695-699.
在提取时间 15 min、提取温度 80 ℃、p-TsOH 质量 [13] ZHANG H, BAI Y C, ZHOU W P, et al. Color reduction of
sulfonated eucalyptus kraftlignin[J]. International Journal of Biological
分数 40%的优化条件下分离得到的 BL 白度高达 Macromolecules, 2017, 97: 201-208.
36.11%，这与木质素结构中含有较少量的羰基和甲 [14] ZHANG H, BAI Y C, YU B M, et al. A practicable process for lignin
氧基有关。拥有较高白度值的木质素可进一步用于 color reduction: Fractionation of lignin using methanol/water as
solvent[J]. Green Chemistry, 2017, 19(21): 5152-5162.
化妆品等对颜色有要求的木质素基材料的制备，研 [15] ZHANG H, CHEN F G, LIU X X, et al. Micromorphology influence
究结果为 BL 的高效提取及高值化利用奠定了基础。 on the color performanceof lignin and its application in guiding the
preparation of light-colored lignin sunscreen[J]. ACS Sustainable
参考文献： Chemistry & Engineering, 2018, 6(9): 12532-12540.
[16] ZHANG H, LIU X X, FU S Y, et al. High-value utilization of kraft
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