Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 70, Issue -, Pages 498-505Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2014.07.024
Keywords
Okra pectin; Optimal extraction; Response surface methodology; Rheological behavior
Funding
- National Natural Science Foundation of China [31171787]
- Funds for Creative Research Groups of Hefei University of Technology [2009-05]
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Response surface methodology (RSM) was applied to optimize the parameters of pectin extraction from okra pods. The extracted okra pectin was then investigated by steady-shear and oscillatory rheological measurements. Statistical analysis showed that the linear term of the liquid-solid ratio, the quadratic term of the pH, and the linear term of the extraction time showed highly significant effects on pectin yield. The optimal extraction conditions that maximized the pectin yield within the experimental range of the variables researched were a pH of 3.9, an extraction time of 64 min, an extraction temperature of 60 degrees C, and a liquid-solid ratio of 42:1. Under these conditions, the pectin yield was predicted to be 2.71%. At a liquid-solid ratio less than 2.5% w/w in aqueous solution, the pectin extracted from okra presented non-Newtonian shear-thinning behavior and could be well described by the Cross model. The okra pectin showed predominantly viscous responses (G' < G) over a wide range of frequencies (10(-1)-10 Hz) at 20% strain. (C) 2014 Elsevier B.V. All rights reserved.
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