Scholarlink

<p>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 (<i>M</i><sub>n</sub>) and polydispersity (<i>Ð</i>=<i>M</i><sub>w</sub>/<i>M</i><sub>n</sub>), as demonstrated by size-exclusion chromatography (SEC). The unprocessed ACM had a weight-average molecular weight (<i>M</i><sub>w</sub>) of 1783&#xa0;kDa, whereas after 16&#xa0;min of US processing, it reached 92.16&#xa0;kDa, and the initial <i>Ð</i> 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.</p> Graphic Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

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

  • 期刊论文

  • 发表日期：

    2025年7月29日

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

摘要

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 (Mn) and polydispersity (Ð=Mw/Mn), as demonstrated by size-exclusion chromatography (SEC). The unprocessed ACM had a weight-average molecular weight (Mw) 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