State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
School of Materials Science and Engineering, South China University of Technology, Guangzhou, China.
J Sep Sci. 2018 Jul;41(13):2731-2735. doi: 10.1002/jssc.201800073. Epub 2018 May 7.
The purpose of this work is to introduce a new method for quantitatively analyzing water absorption capacity in wheat flour by a headspace gas chromatographic technique. This headspace gas chromatographic technique was based on measuring the water vapor released from a series of wheat flour samples with different contents of water addition. According to the different trends between the vapor and wheat flour phase before and after the water absorption capacity in wheat flour, a turning point (corresponding to water absorption capacity in wheat flour) can be obtained by fitting the data of the water gas chromatography peak area from different wheat flour samples. The data showed that the phase equilibrium in the vial can be achieved in 25 min at desired temperature (35°C). The relative standard deviation of the reaction headspace gas chromatographic technique in water absorption capacity determination was within 3.48%, the relative differences has been determined by comparing the water absorption capacity obtained from this new analytical technique with the data from the reference technique (i.e., the filtration method), which are less than 8.92%. The new headspace gas chromatographic method is automated, accurate and be a reliable tool for quantifying water absorption capacity in wheat flour in both laboratory research and mill applications.
本工作旨在介绍一种通过顶空气相色谱技术定量分析面粉吸水率的新方法。该顶空气相色谱技术基于测量一系列添加不同水分含量的面粉样品释放出的水蒸气。根据面粉样品水气相色谱峰面积数据的不同趋势，在面粉吸水率前后的水蒸气和面粉相之间可以得到一个转折点（对应于面粉吸水率）。数据表明，在所需温度（35°C）下，小瓶中的相平衡可以在 25 分钟内达到。通过比较新分析技术与参考技术（即过滤法）获得的吸水率数据，反应顶空气相色谱技术在吸水率测定中的相对标准偏差在 3.48%以内，相对差异小于 8.92%。新的顶空气相色谱法自动化程度高，准确可靠，是实验室研究和工厂应用中定量测定面粉吸水率的可靠工具。
