Journal
CARBOHYDRATE POLYMERS
Volume 172, Issue -, Pages 102-112Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.05.030
Keywords
Carica papaya; Soluble dietary fiber; Ultrasound-assisted alkaline extraction; Optimization; Comparison
Categories
Funding
- National Natural Science Foundation of China [31660495]
- Natural Science Foundation of Hainan Province of China [317002]
- Hainan University Startup Scientific Research Projects of China [kyqd1630]
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Soluble dietary fiber (SDF) from the peel of papaya (Carica papaya Linn.) was recovered through alkaline extraction (alkaline-extracted SDF, a-SDF) and ultrasound-assisted alkaline extraction (ultrasound treated SDF, u-SDF) processes, and the composition, structure and properties of the extracts were compared. The optimal parameters for obtaining the maximum extraction yield of u-SDF were evaluated through response surface methodology. Under optimal conditions, the maximum yield of u-SDF was 36.99%, and u-SDF had a lower total amino acid content but a higher essential amino acid (16.18%) than a-SDF. A monosaccharide analysis indicated that the primary sugars in a-SDF and u-SDF were neutral sugars and pectic saccharides, respectively. An X-ray diffraction analysis confirmed that u-SDF was less crystalline than a-SDF. Moreover, a thermal analysis indicated that u-SDF exhibited higher thermal stability. In addition, u-SDF exhibited higher water-holding, oil-holding and swelling capacities than a-SDF. These results indicate that papaya peel is a potential inexpensive source of natural dietary fiber and a potential functional food ingredient. (C) 2017 Elsevier Ltd. All rights reserved.
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