Journal
FOOD CHEMISTRY
Volume 287, Issue -, Pages 346-353Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2019.02.100
Keywords
Morin; Banana; Polysaccharide; Softening; Structure
Funding
- National Key Research and Development Program of China [2017YFD0401301]
- National Natural Science Foundation of China [31671906, 31871851]
- Frontier Science Key Program of Chinese Academy of Sciences [QYZDB-SSW-SMC018]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2011252]
- Science and Technology Plan of Guangdong Province [2018A050506062]
- Natural Science Foundation of Guangdong Province [2015A030313604]
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The degradation of cell wall polysaccharides is highly associated with the softening process of banana. In this work, banana was treated by morin to delay softening during storage. Water-soluble polysaccharides were extracted from banana pulp at four storage stages. Their levels increased when the banana was green, but decreased when turned to yellow. Three types of polysaccharides were identified by nuclear magnetic resonance spectroscopy, including starches, homogalacturonans and arabinogalactan proteins. (1 -> 4)-alpha-D-galacturonan constructed the backbone of homogalacturonans, which was the leading water-soluble polysaccharide in the last stage. Starch was the dominant polysaccharide at all stages in morin-treated banana. Deassembly of insoluble starch granules and degradation of soluble starches were responsible for its high level in banana. Arabinogalactan proteins were only detected in late stages, and could be a marker for banana deterioration. The inhibited degradation of cell wall polysaccharides contributed to the preservative effect of morin.
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