从柑桔皮中分离果胶：一种基于柠檬酸/柠檬酸钠溶液绿色萃取剂的新方法,ACS Sustainable Chemistry & Engineering

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从柑桔皮中分离果胶：一种基于柠檬酸/柠檬酸钠溶液绿色萃取剂的新方法
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-01-03 , DOI: 10.1021/acssuschemeng.0c07422
Caian He ₁ , Imca Sampers ₁ , Katleen Raes ₁

Affiliation

提出了一种在不同pH值下以柠檬酸/柠檬酸钠溶液（CSS）作为绿色提取剂从柑桔果皮中提取果胶的新方法。在这项研究中，提取温度（65–85°C），CSS pH（2–8）和提取时间（1-3h）对提取率，糖醛酸含量和甲基酯化程度（DE）的影响）的柑桔果胶果胶（CMP）通过响应面方法（RSM）进行了系统评估。与传统方法相比，通过这种新方法提取的CMP具有更高的果胶收率（19.90–34.94％）和糖醛酸含量（44.96–65.11％），以及宽的DE值（11.05–84.71％）。CMP的这些功能特性主要由CSS pH和萃取温度决定。与商业柑橘果胶（CP）相比，提取的CMP蛋白质含量较低，分子量较大。对单糖组成的分析表明，高和低甲基酯化的CMP分别由同型半乳糖醛酸和鼠李糖半乳糖醛酸I主导。高甲基化和低甲基化的CMP之间的结构差异通过FTIR光谱确定。特别是，在低甲基酯化的CMP溶液中发现了极好的凝胶形成能力，因为它们的流变行为对低pH和Ca的存在高度敏感。²⁺。

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Isolation of Pectin from Clementine Peel: A New Approach Based on Green Extracting Agents of Citric Acid/Sodium Citrate Solutions

A new approach to extract pectin from clementine peel using citric acid/sodium citrate solutions (CSS) at different pHs as green extracting agents was proposed. In this study, the effects of extraction temperature (65–85 °C), CSS pH (2–8), and extraction time (1–3 h) on the extraction yield, uronic acid content, and degree of methyl esterification (DE) of the clementine peel pectin (CMP) were systematically evaluated by response surface methodology (RSM). Compared with traditional methods, the CMP extracted by this new approach was of higher pectin yield (19.90–34.94%) and uronic acid content (44.96–65.11%), as well as a wide DE value (11.05–84.71%). These functional properties of CMP were mainly determined by the CSS pH and extraction temperature. In comparison with commercial citrus pectin (CP), the extracted CMPs showed lower protein contents and larger molecular weights. The analysis of monosaccharide compositions showed that the high- and low-methyl-esterified CMPs were dominated by homogalacturonans and rhamnogalacturonan-I, respectively. The structural differences between high- and low-methyl-esterified CMPs were identified by their FTIR spectra. Especially, an excellent gel-forming capacity was found in low-methyl-esterified CMP solutions since their rheological behaviors were highly sensitive to low pH and the presence of Ca²⁺.

更新日期：2021-01-18

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