Journal
PROCESSES
Volume 7, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/pr7070416
Keywords
pectin; natural deep eutectic solvent; Citrus grandis; definitive screening design; pomelo; extraction
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Funding
- Frontier Research Grant [FG030-17AFR]
- University Malaya Centre for Ionic Liquids (UMCiL)
- Ministry of Education [FRGS19-027-0635]
- RU Geran-Fakulti Program [GPF064B-2018]
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Background: Natural deep eutectic solvents (NADESs) can be used for extracting a wide range of biomaterials, such as pectin. This study introduces a new generation of natural solvents for pectin extraction which could replace the conventional solvents in the food industry. Methods: In this study, NADESs were used for pectin extraction from pomelo (Citrus grandis (L.) Osbeck) peels using a sonoreactor. Definitive screening design (DSD) was used to screen the influence of time, temperature, solid/liquid ratio, and NADES/water ratio on the pectin yield and degree of esterification (DE). Results: The primary screening revealed that the best choices for the extraction were choline chloride-malonic acid (ChCl-Mal) and choline chloride-glucose-water (ChCl:Glc:W). Both co-solvents yielded 94% pectin and 52% DE after optimization at 80 degrees C, with 60 min of sonication, pH < 3.0, and a NADES-to-water ratio of 1:4.5 (v/v). Morphological screening showed a smooth and compact surface of the pectin from ChCl-Mal where glucose-based pectin had a rough surface and lower DE. Conclusions: NADESs proved to be promising co-solvents for pectin extraction with a high degree of esterification (>55%).
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