食品工业科技2025，Vol.46Issue(13)：233-242,10.DOI:10.13386/j.issn1002-0306.2024070413
ι-卡拉胶低浓度碱均相提取工艺优化及其性质分析
Process Optimization and Properties Analysis of ι-Carrageenan via Homogeneous Extraction at Low Alkaline Concentration
摘要
Abstract
Traditional heterogeneous extraction of ι-carrageenan(NaOH extraction of ι-carrageenan,NaOH-IC)has the problems of high alkali consumption and complicated process.In this study,an alternative homogeneous system was used to extract ι-carrageenan.The colloid was boiled out from Eucheuma spinosum and desulphurized under low-concentration KOH condition.After neutralized with CO2,ι-carrageenan was obtained by alcohol precipitation(KOH extraction of ι-carrageenan,KOH-IC).The gel strength was used as the main evaluation index to optimize the extraction conditions of ι-carrageenan.As the optimized process conditions were KOH concentration 0.1 mol/L,alkali treatment time 5 h,reaction temperature 70 ℃,and material-liquid ratio 1∶30(w/v,g/mL),the ι-carrageenan gel strength reached 250.8 g/cm2.Compared with the traditional process,KOH-IC exhibited lower sulfate content and viscosity.The solidification temperature and melting temperature of KOH-IC were 58.2 ℃ and 60.5 ℃,which were lower than those of NaOH-IC.The thermal decomposition temperature of KOH-IC was 275 ℃,which was significantly higher than that of NaOH-IC.The overall textural properties of KOH-IC were better than NaOH-IC,and their hardness,chewiness and adhesion results had significant differences(P＜0.05).FT-IR analysis showed that compared with NaOH-IC,KOH-IC did not cause the generation of new absorption peaks.It indicated that different extraction processes do not lead to changes in the structure ofι-carrageenan.In sum,compared with the traditional heterogeneous extraction process,the ι-carrageenan product obtained from low concentration alkaline homogeneous extraction process has excellent overall textural properties.Furthermore,this new process has the advantages of easy operation and green extraction,and so on.关键词
ι-卡拉胶/低浓度碱/均相提取/理化性质/结构表征Key words
ι-carrageenan/low concentration of alkali/homogeneous extraction/physicochemical properties/structural characterization分类
轻工业引用本文复制引用
龙小菊,王欣怡,肖琼,陈福泉,翁惠芬,陈俊,杨秋明,肖安风..ι-卡拉胶低浓度碱均相提取工艺优化及其性质分析[J].食品工业科技,2025,46(13):233-242,10.基金项目
国家自然科学基金资助项目(22278173,32201941) （22278173,32201941）
福建省自然科学基金资助项目(2021J01834,2021J01836,2022J01805). （2021J01834,2021J01836,2022J01805）
