Effects of Ultrasonic Processing on the Structural Properties and Chain Scission of the Acemannan Biopolymer

IF 5 3区工程技术 Q2 ENGINEERING, ENVIRONMENTAL

Journal of Polymers and the Environment Pub Date : 2025-07-29 DOI:10.1007/s10924-025-03649-7

Tonny Araujo Moreira, Carlos M. R. Abreu, Jorge F. J. Coelho, Cleocir José Dalmaschio

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Abstract

Biopolymers and mechanochemical processes are alternatives that have gained importance because of environmental concerns. In this study, the biopolymer acemannan (ACM) was extracted and processed via ultrasonication (US), which altered the ACM properties, including molecular weight and solubility. The short processing time of US promoted the scission of ACM chains, increasing their solubility and decreasing their viscosity. With increasing processing time, chain scission was observed, decreasing the number-average molecular weight (M_n) and polydispersity (Ð=M_w/M_n), as demonstrated by size-exclusion chromatography (SEC). The unprocessed ACM had a weight-average molecular weight (M_w) of 1783 kDa, whereas after 16 min of US processing, it reached 92.16 kDa, and the initial Ð changed from 2.84 to 2.24. The Ovenall model assumes a first-order kinetic behavior and is suitable for describing the chain scission mechanism. Viscosity measurements highlight the relationship between polymer‒solvent interactions and molecular weight. This work contributes to future studies on the mechanochemical processing of ACM with applications in health, food and the synthesis of functional biomaterials.

Graphic Abstract

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超声处理对葡甘露聚糖生物聚合物结构性质和链断裂的影响

生物聚合物和机械化学工艺是由于环境问题而变得重要的替代品。在本研究中，通过超声波（US）提取和处理生物聚合物乙酰甘露聚糖（ACM），改变了ACM的性质，包括分子量和溶解度。美国的短加工时间促进了ACM链的断裂，提高了其溶解度，降低了其粘度。粒径隔离色谱（SEC）表明，随着处理时间的延长，链断裂，数平均分子量（Mn）和多分散性（Ð=Mw/Mn）降低。未处理的ACM分子量（Mw）为1783 kDa，而经过16 min的US处理后，其分子量达到92.16 kDa，初始的Ð由2.84变为2.24。总体模型为一级动力学行为，适合于描述断链机理。粘度测量强调聚合物-溶剂相互作用和分子量之间的关系。这项工作有助于未来研究ACM的机械化学加工在保健、食品和功能性生物材料合成方面的应用。图形抽象

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来源期刊

Journal of Polymers and the Environment 工程技术-高分子科学

CiteScore

9.50

自引率

7.50%

发文量

297

审稿时长

9 months

期刊介绍： The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.