Evaluation of the Nanostructure of Pectin, Hemicellulose and Cellulose in the Cell Walls of Pears of Different Texture and Firmness View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2014-12

AUTHORS

A. Zdunek, A. Kozioł, P. M. Pieczywek, J. Cybulska

ABSTRACT

The nanostructure of polysaccharides is supposed to determine properties such as stiffness or diffusivity of cell walls and their functionality for various tailored properties of food. However, at present, a relation of these nano-properties with sensory texture and firmness remains to some degree unknown. In this work, water (WSP), calcium chelator (CSP) and sodium carbonate (DASP) soluble pectins, hemicellulose and cellulose, extracted from cell walls of two pear cultivars ‘Xenia’ and ‘Conference’ at their harvest times, were studied. An atomic force microscope and image analysis were used to evaluate diameter and branching of the molecules. Sensory texture of ‘Xenia’ was considered as better and its firmness (87 N) was higher than ‘Conference’ (76 N). WSP molecules were present as short molecules with a height of about 0.5 nm for both cultivars. A chain-like and branched CSP fraction had diameter of about 0.3–0.4 nm for both cultivars with a pronounced contribution of molecules with diameter of about 1 nm for ‘Xenia’, which had also higher branching index. DASP revealed similar regular structures for both cultivars however the network was much denser for ‘Xenia’. A rod-like hemicellulose molecules had length of about 20–400 nm and diameter of 1 nm for ‘Xenia’ and 1–4 nm for ‘Conference’. Cellulose diameter for both cultivars was about 23 nm. This study showed that less degraded, thicker and more branched pectin molecules were associated with higher firmness and more favourable texture. Hemicellulose provided a positive contribution to texture when they were thinner and more flexible. More... »

PAGES

3525-3535

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11947-014-1365-z

DOI

http://dx.doi.org/10.1007/s11947-014-1365-z

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1041553749


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