混合卡拉基南与卡帕-约塔-卡拉基南混合物:对水凝弹性特性进行比较研究
Maria Alice Freitas Monteiro1, Bruno Faria1, Izabel Cristina Freitas Moraes2
1Institute for Polymers and Composites, University of Minho, 5800-048 Guimarães, Portugal.
Gels (Basel, Switzerland)
|March 26, 2025
概括
混合卡拉基南 (KIs) 与卡帕和约塔-卡拉基南 (K+Is) 混合物相比,提供更窄的凝范围. 它们的凝潜力是盐特异性的,在KCl环境中显示出希望,但不是NaCl环境.
科学领域:
- 食品科学与技术 食品科学与技术
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
背景情况:
- 胡卜素是广泛使用的合物,具有多种凝性质.
- 了解卡拉基安的结构-性质关系对于优化食品和材料应用至关重要.
- 在控制凝特性方面,区分卡拉基南混合物和混合结构是关键.
研究的目的:
- 为了比较kappa-和iota-carrageenan (K+Is) 的凝性质,它与混合型卡拉基南 (KIs) 混合.
- 确定在哪些条件下,KIs是可行的替代品,以K+Is混合物为凝应用.
- 在卡拉基南系统中识别相隔结构和同聚合螺旋.
主要方法:
- 在化和化溶液中的凝的比较分析.
- 对不同离子强度和多糖度的相位状态的研究.
- 测量卡拉基南凝的剪切弹性模块和非线性弹性特性.
主要成果:
- 混合焦糖 (KIs) 的离子强度和多糖度呈现较窄的凝范围.
- 基因分析表明盐的特异性,在KCl中凝但不是NaCl,表明Na+凝潜力有限.
- 在两种系统中在特定条件下 (低离子强度,高IOTA-CARRAGEANAN含量) 观察到两步凝机制.
- KI凝通常比混合物具有较低的剪切弹性模块,除非KCl的离子强度较低或含有较高IOTA-CARRAGEAN的含量.
- 非线性弹性特性独立于混合与混合结构;较高的IOTA-卡拉基安含量允许更大的应变耐受性,但增加了应变软化,而较高的卡帕-卡拉基安含量导致应变硬化.
结论:
- 混合卡拉基南与卡拉基南混合物相比,具有更受限制的凝能力.
- 盐的环境显著影响混合色素的凝行为.
- 卡拉基安的凝特性,包括应变耐受性和软化/硬化,主要取决于卡帕-约塔-卡拉基安的比率,而不是混合与混合结构.
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