High-purity κ-carrageenan from Kappaphycus alvarezii algae for aerogel production by supercritical CO2 drying

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2024-11-12 DOI:10.1016/j.supflu.2024.106454

Adenilson Renato Rudke , Cristiano José de Andrade , Sandra Regina Salvador Ferreira

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引用次数: 0

Abstract

Carrageenan, a polysaccharide mostly extracted from Kappaphycus alvarezii (KA), is valuable for cosmetic and food uses due to large quantities of κ-carrageenan. High-pressure sequential extractions can recover high-purity carrageenan from KA, adequate for aerogel production. The biopolymer properties such as size, shape, and sulphate groups affect the gel form and aerogel characteristics. In this work, aerogels were obtained by supercritical CO₂ drying, and cryogels by freeze-drying, using high-purity carrageenan, recovered by sequential high-pressure extractions (HP), and commercial carrageenan (CC). The results indicated that HP samples showed higher volumetric shrinkage (96 %), firmness (254 N), and envelope density (0.008 g.cm⁻³) compared to CC samples. Aerogels presented characteristics of pore volume, surface area, and density suggesting supercritical drying as feasible method to produce porous materials. Besides, the aerogels present valuable properties compared to cryogel, including high firmness, useful for applications in packages, scaffolds, or delivery systems, a tendency that must be increasingly explored.

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利用超临界二氧化碳干燥法生产气凝胶的高纯度κ-卡拉胶藻藻胶

卡拉胶是一种多糖，主要从 Kappaphycus alvarezii（KA）中提取，由于含有大量的 κ-卡拉胶，因此在化妆品和食品方面具有重要价值。高压连续萃取法可以从 KA 中回收高纯度卡拉胶，足以用于气凝胶的生产。生物聚合物的特性（如大小、形状和硫酸基团）会影响凝胶形态和气凝胶特性。在这项工作中，使用连续高压提取（HP）回收的高纯度卡拉胶和商用卡拉胶（CC），通过超临界二氧化碳干燥获得了气凝胶，通过冷冻干燥获得了低温凝胶。结果表明，与 CC 样品相比，HP 样品的体积收缩率（96%）、硬度（254 N）和包膜密度（0.008 g.cm-3）更高。气凝胶呈现出孔隙体积、表面积和密度等特征，表明超临界干燥是生产多孔材料的可行方法。此外，与低温凝胶相比，气凝胶还具有一些宝贵的特性，包括高硬度，可用于包装、支架或输送系统，这一趋势必须得到越来越多的探索。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.