UV light-induced photodegradation of condensed tannins: obtaining bayberry tannins with different mean polymerization degrees

IF 3.1 2区 农林科学 Q1 FORESTRY
Ying Zhou, Yan Zhang, Yuting Zhang, Wenjing Hu, Shuguang Han
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Abstract

Condensed tannins (CTs) characterized by a low degree of polymerization (DP) are recognized to have substantial value for applications across diverse industrial sectors, including food production, pharmaceuticals, and wood adhesive manufacturing. To acquire CTs with a low DP, the depolymerization of bayberry tannins (BTs) through a novel approach utilizing UV light-driven photocatalytic degradation, facilitated by the ultrasonic dispersion of TiO2 nanoparticles was investigated. Under the optimal degradation conditions (a tannin concentration of 6%, a TiO2 nanoparticles loading amount of 0.20%, and a degradation time of 4 h), the study delineated a discernible linear relationship correlating both the degradation time with the formaldehyde reactivity of the photocatalytic degradation products, and the formaldehyde reactivity with the mean degree of polymerization (mDP) of these photocatalytic degradation products. With the establishment of these correlative relationships, it is feasible to systematically control the degradation process of BTs. The photocatalytic degradation process adhered to the following mechanism: The degradation process of BTs is initiated by the cleavage of the C4-C8 bond which, at the incipient stage of degradation, results in the elimination of one gallocatechin gallate unit and one gallocatechin unit, or alternatively, the removal of a gallocatechin dimer. During the advanced stages of degradation, the opening of the C ring gives rise to different derivatives. Upon establishing optimal degradation parameters, it was observed that the primary constituents of the photocatalytic degradation products were dimers. The utilization of photocatalytic degradation exhibited an ability to break down condensed tannins in a manner that is both controllable and in an environmentally friendly way.

Abstract Image

紫外线诱导缩合单宁的光降解:获得不同平均聚合度的杨梅单宁
以低聚合度(DP)为特征的缩合单宁(CTs)被认为在食品生产、制药和木材粘合剂制造等多个工业领域具有重要的应用价值。为了获得低聚合度的月桂单宁,研究人员采用了一种新方法,即利用紫外线驱动光催化降解,并在 TiO2 纳米粒子超声波分散的促进下,对月桂单宁(BTs)进行解聚。在最佳降解条件下(单宁酸浓度为 6%,TiO2 纳米粒子的负载量为 0.20%,降解时间为 4 小时),研究发现降解时间与光催化降解产物的甲醛反应性以及甲醛反应性与这些光催化降解产物的平均聚合度(mDP)之间存在明显的线性关系。建立了这些相关关系,就可以系统地控制 BTs 的降解过程。光催化降解过程遵循以下机理:BTs 的降解过程由 C4-C8 键的裂解开始,在降解的初级阶段,一个没食子儿茶素没食子酸酯单元和一个没食子儿茶素单元被清除,或者一个没食子儿茶素二聚体被清除。在降解的高级阶段,C 环的打开会产生不同的衍生物。在确定最佳降解参数后,发现光催化降解产物的主要成分是二聚体。利用光催化降解技术能够以可控和环保的方式分解缩合单宁酸。
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来源期刊
Wood Science and Technology
Wood Science and Technology 工程技术-材料科学:纸与木材
CiteScore
5.90
自引率
5.90%
发文量
75
审稿时长
3 months
期刊介绍: Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.
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