Polymerization and product characteristics of polyphenols of Pinus sylvestris var. mongolica barks and protein.

ZHAO Yu-hong; ZHAI Ya-nan; XU Yao-peng; ZHANG Li-gang; WANG Zhen-yu

doi:10.13332/j.1000-1522.20150323

Journal of Beijing Forestry University > 2016 > 38(9): 102-107. > DOI: 10.13332/j.1000-1522.20150323

ZHAO Yu-hong, ZHAI Ya-nan, XU Yao-peng, ZHANG Li-gang, WANG Zhen-yu. Polymerization and product characteristics of polyphenols of Pinus sylvestris var. mongolica barks and protein.[J]. Journal of Beijing Forestry University, 2016, 38(9): 102-107. DOI: 10.13332/j.1000-1522.20150323

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Polymerization and product characteristics of polyphenols of Pinus sylvestris var. mongolica barks and protein.

1.
1 College of Forestry, Northeast Forestry University, Harbin,Heilongjiang, 150040, P. R. China;
2.
2 Food Science College, Northeast Agricultural University, Harbin,Heilongjiang, 150030, P. R. China;
3.
3 Chemical Engineering Institute, Harbin Institute of Technology, Harbin, Heilongjiang, 150090, P. R. China.

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Received Date: September 06, 2015
Published Date: September 29, 2016

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Abstract

Abstract

Polymerization of polyphenols and protein is affected by multiple factors. This study was designed to clarify the optimal polymerization conditions of gelatin and polyphenols from Pinus sylvestris var. mongolica, with soy protein isolate (SPI) as protein substrate. The characteristics of product were analyzed with infrared spectrophotometry and differential scanning calorimetry (DSC), and our goal was to improve the polymerization rate. The results showed that: for polyphenols-gelatin polymerization, the optimal conditions were the mass ratio of polyphenols to gelatin 2∶1, reaction temperature 40 ℃, 30-min duration and pH 7.0. Under these conditions, 70.35% of polyphenols were polymerized. For polyphenols-SPI polymerization, the optimal conditions were the mass ratio of SPI to polyphenols 4∶1, reaction temperature 30 ℃, reaction time 20 min and pH 5.0; in this case, 47.21% of polyphenols were polymerized. The polymerization rate of polyphenols-gelatin was significantly higher than that of polyphenols-SPI (P0.05). IR spectroscopic results showed that polyphenols and proteins were cross-linked, resulting in the OH stretching vibration and intensive absorptions were detected at the 3 600-3 200 cm-1. OH, CH, NH, SH and other groups had obvious changes after polymerization. The results of DSC showed that heat denaturation temperatures were raised after polymerization.
- Pinus sylvestris var. mongolica,
- polyphenols,
- protein,
- polymerization,
- characteristics

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