Extraction, structural analysis of walnut dietary fibers and effects of particles on its physiochemical properties

GENG Shu-wen; ZHANG You-lin; ZHANG Run-guang; RUAN Xiao-hui; HE Xin; JIN Zi-chun

doi:10.13386/j.issn1002-0306.2017.18.010

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Science and Technology of Food Industry > 2017 > (18): 50-55. > DOI: 10.13386/j.issn1002-0306.2017.18.010

GENG Shu-wen, ZHANG You-lin, ZHANG Run-guang, RUAN Xiao-hui, HE Xin, JIN Zi-chun. Extraction, structural analysis of walnut dietary fibers and effects of particles on its physiochemical properties[J]. Science and Technology of Food Industry, 2017, (18): 50-55. DOI: 10.13386/j.issn1002-0306.2017.18.010

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Extraction, structural analysis of walnut dietary fibers and effects of particles on its physiochemical properties

College of Food Engineering and Nutritional Science, Shaanxi Normal University

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Received Date: February 28, 2017

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Abstract

To provide basis and reference for the utilization of walnut dietary fibers, walnut dietary fibers were extracted using chemical extraction methods and the physiochemical properties of five fibers with different particles sizes, including below 40 mesh, 40⁶0 mesh, 60⁸0 mesh, 80¹20 mesh, 120¹60 mesh and beyond 160 mesh, were also investigated.Results suggested that the yield of walnut dietary fibers, composing mainly of 76.34% of dietary fibers and 5.41% of protein, was 12.47%.Infrared spectroscopy scanning pictures indicated that walnut dietary fibers had remark absorbance at 3420 cm^-1, suggesting fiber structure had not been destructed.The significant differences of water-keeping capability, swelling capability and viscosity were observed during determining physiochemical properties of five dietary fibers with varying particle sizes.The best water-keeping capability, 7.76 g·g^-1, was observed in walnut dietary fibers with 120 ~ 160 mesh, and the best swelling capability and viscosity, 5.28 m L·g^-1, 21.25 m Pa·s, respectively, both were observed in dietary fibers with 80¹20 mesh.However, walnut dietary fibers size over 160 mesh had the best oil-keeping capability, with 1.92 g·g^-1. In addition, absorption capability of glucose was optimum at the particles 120 to 160 mesh, cation absorptin capability peaked at the particle range of 80 to 120 mesh.Overall, walnut dietary fibers with the particle size of 80¹60 mesh had the optimum physiochemical properties.
- deoiled walnut,
- dietary fibers,
- particle sizes,
- physiochemical properties,
- absorption capability of glucose,
- absorption capability of cation

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