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Int. J. Mol. Sci. 2013, 14(12), 23356-23368; doi:10.3390/ijms141223356
Article

Modification of Pectin and Hemicellulose Polysaccharides in Relation to Aril Breakdown of Harvested Longan Fruit

1,†
, 1,†
, 1
, 1
, 2
 and 1,*
Received: 9 October 2013; in revised form: 19 November 2013 / Accepted: 21 November 2013 / Published: 27 November 2013
(This article belongs to the Section Bioactives and Nutraceuticals)
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Abstract: To investigate the modification of cell wall polysaccharides in relation to aril breakdown in harvested longan fruit, three pectin fractions (WSP, water soluble pectin; CSP, CDTA-soluble pectin; ASP, alkali soluble pectin) and one hemicellulose fraction (4 M KOH-SHC, 4 M KOH-soluble hemicellulose) were extracted, and their contents, monosaccharide compositions and molecular weights were evaluated. As aril breakdown intensified, CSP content increased while ASP and 4 M KOH-SHC contents decreased, suggesting the solubilization and conversion of cell wall components. Furthermore, the molar percentage of arabinose (Ara), as the main component of the side-chains, decreased largely in CSP and ASP while that of rhamnose (Rha), as branch point for the attachment of neutral sugar side chains, increased during aril breakdown. Analysis of (Ara + Gal)/Rha ratio showed that the depolymerization of CSP and ASP happened predominantly in side-chains formed of Ara residues. For 4 M KOH-SHC, more backbones were depolymerized during aril breakdown. Moreover, it was found that the molecular weights of CSP, ASP and 4 M KOH-SHC polysaccharides tended to decrease as aril breakdown intensified. These results suggest that both enhanced depolymerization and structural modifications of polysaccharides in the CSP, ASP and 4 M KOH-SHC fractions might be responsible for aril breakdown of harvested longan fruit.
Keywords: aril breakdown; cell wall degradation; pectin; matrix glycan; depolymerization aril breakdown; cell wall degradation; pectin; matrix glycan; depolymerization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Wang, D.; Zhang, H.; Wu, F.; Li, T.; Liang, Y.; Duan, X. Modification of Pectin and Hemicellulose Polysaccharides in Relation to Aril Breakdown of Harvested Longan Fruit. Int. J. Mol. Sci. 2013, 14, 23356-23368.

AMA Style

Wang D, Zhang H, Wu F, Li T, Liang Y, Duan X. Modification of Pectin and Hemicellulose Polysaccharides in Relation to Aril Breakdown of Harvested Longan Fruit. International Journal of Molecular Sciences. 2013; 14(12):23356-23368.

Chicago/Turabian Style

Wang, Duoduo; Zhang, Haiyan; Wu, Fuwang; Li, Taotao; Liang, Yuxiang; Duan, Xuewu. 2013. "Modification of Pectin and Hemicellulose Polysaccharides in Relation to Aril Breakdown of Harvested Longan Fruit." Int. J. Mol. Sci. 14, no. 12: 23356-23368.



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