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- W2019343708 abstract "ABSTRACT Cereal β‐glucan can function as a thickener, but endogenous β‐glucanase enzymes of the grain cleave β‐glucan, reducing its viscosity. Although different extraction techniques have been developed, the viscosity stability of β‐glucan gum has not been reported. The objective of this study was to investigate the effect of extraction treatments on the yield, purity, and viscosity stability of barley β‐glucan (BBG) gum. A regular barley cultivar, Condor, and a waxy cultivar blend were extracted at pH 7–10 and 55°C for 0.5 hr. Four extraction conditions were evaluated: 1) extraction at high pH with no additional heat treatment; 2) boiling of extract; 3) prior refluxing of flour with 70% ethanol; and 4) treatment of extract with thermostable α‐amylase for purification. Viscosity of extracts was monitored for ≥24 hr at 25°C. The highest β‐glucan purities were achieved with a boiled Condor extract at pH 7 (81.3% db, 4.1% yield) and with refluxed waxy barley extracted at pH 8 and treated with α‐amylase and (79.3% db, 5.1% yield). Gums extracted without subsequent heat treatment or prior refluxing of flour had high protein (>17%) and starch (>24%) impurities, respectively. The viscosity of gums obtained without heating was unstable. Prior refluxing treatment was not sufficient to stabilize final extracts. Boiling extracts resulted in stable but low viscosity. Reflux followed by purification treatment produced the highest stable viscosity for 0.5% solutions of both Condor (64 mPa sec ‐1 , pH 7) and waxy (48.8 mPa sec ‐1 , pH 8) extracts. Stable BBG gum with high viscosity can be obtained using thermal treatments in combination with high pH. The potential use of such gums as thickeners in food systems needs to be assessed." @default.
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- W2019343708 date "1998-11-01" @default.
- W2019343708 modified "2023-09-27" @default.
- W2019343708 title "Effect of Extraction Conditions on Yield, Composition, and Viscosity Stability of Barley β‐Glucan Gum" @default.
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- W2019343708 doi "https://doi.org/10.1094/cchem.1998.75.6.805" @default.
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