Fourier Transform Infrared Spectroscopy (FTIR) was used to quantify total monosaccharide content in the bacterium Enterobacter cloacae and several of its biofilm mutants. Bacterial biofilm samples were grown on trypti...Fourier Transform Infrared Spectroscopy (FTIR) was used to quantify total monosaccharide content in the bacterium Enterobacter cloacae and several of its biofilm mutants. Bacterial biofilm samples were grown on trypticase soy agar, and 30 μL aliquots of aqueous sample bacterial plus biofilm were deposited into the center of barium fluoride crystals and dried at 50°C for 1-hour before being scanned by FTIR. The total amounts of monosaccharides were estimated using the absorbance of the mono-saccharide peak, 1192 - 958 cm–1, and normalized using the amide II peak, 1585 - 1483 cm–1. This method provided a linear correlation between the absorbance of the monosaccharide peak and concentration of monosaccharide in standard monosaccharides, fructose, glucose, mannose, and rhamnose, over a concentration range of 0.5 - 2.0 mg/mL.展开更多
以153个单植物源和混合植物源蜂蜜样品为研究对象,使用3种近红外光谱仪(FT型、CCD型、PDA型)采集蜂蜜的透反射和透射光谱,并应用近红外定量分析技术进行蜂蜜中主要成分(水分含量、果糖含量、葡萄糖含量)的检测研究。用偏最小二乘回归(pa...以153个单植物源和混合植物源蜂蜜样品为研究对象,使用3种近红外光谱仪(FT型、CCD型、PDA型)采集蜂蜜的透反射和透射光谱,并应用近红外定量分析技术进行蜂蜜中主要成分(水分含量、果糖含量、葡萄糖含量)的检测研究。用偏最小二乘回归(partial least square repression,PLSR)方法分别建立了蜂蜜水分含量、果糖含量、葡萄糖含量的近红外定量分析模型。结果表明,水分含量、果糖含量、葡萄糖含量的相关系数(r)分别达到0.9785,0.9311和0.8907,预测误差均方根(RMSEP)分别为0.4108(%),1.9144(%)和2.5319(%)。研究表明基于近红外光谱的蜂蜜主要成分快速无损检测准确度高,具有很高的实用价值。展开更多
目的:建立蜂蜜中主要成分含量的快速测定方法。方法 :以不同生产基地的蜂蜜样品为研究对象,利用傅立叶近红外光谱仪采集蜂蜜的透反射光谱,并应用近红外定量分析技术进行了蜂蜜中主要成分(水分、果糖、葡萄糖和还原糖)的含量检测研究。...目的:建立蜂蜜中主要成分含量的快速测定方法。方法 :以不同生产基地的蜂蜜样品为研究对象,利用傅立叶近红外光谱仪采集蜂蜜的透反射光谱,并应用近红外定量分析技术进行了蜂蜜中主要成分(水分、果糖、葡萄糖和还原糖)的含量检测研究。用偏最小二乘法(Partial Least Squares,PLS)分别建立了蜂蜜水分、果糖、葡萄糖和还原糖的近红外定量分析模型。结果 :蜂蜜中水分、果糖、葡萄糖和还原糖定量模型的相关系数(r)分别达到0.997 25,0.973 90,0.927 94和0.952 68,预测误差均方根(Root Mean Square Error of Prediction,RMSEP)分别为0.165%,0.564%,1.300%和1.270%。结论:应用近红外光谱技术对蜂蜜的主要成分进行快速无损测定具有较高精确度,该方法可用于蜂蜜主要成分的定量检测。展开更多
文摘Fourier Transform Infrared Spectroscopy (FTIR) was used to quantify total monosaccharide content in the bacterium Enterobacter cloacae and several of its biofilm mutants. Bacterial biofilm samples were grown on trypticase soy agar, and 30 μL aliquots of aqueous sample bacterial plus biofilm were deposited into the center of barium fluoride crystals and dried at 50°C for 1-hour before being scanned by FTIR. The total amounts of monosaccharides were estimated using the absorbance of the mono-saccharide peak, 1192 - 958 cm–1, and normalized using the amide II peak, 1585 - 1483 cm–1. This method provided a linear correlation between the absorbance of the monosaccharide peak and concentration of monosaccharide in standard monosaccharides, fructose, glucose, mannose, and rhamnose, over a concentration range of 0.5 - 2.0 mg/mL.
文摘以153个单植物源和混合植物源蜂蜜样品为研究对象,使用3种近红外光谱仪(FT型、CCD型、PDA型)采集蜂蜜的透反射和透射光谱,并应用近红外定量分析技术进行蜂蜜中主要成分(水分含量、果糖含量、葡萄糖含量)的检测研究。用偏最小二乘回归(partial least square repression,PLSR)方法分别建立了蜂蜜水分含量、果糖含量、葡萄糖含量的近红外定量分析模型。结果表明,水分含量、果糖含量、葡萄糖含量的相关系数(r)分别达到0.9785,0.9311和0.8907,预测误差均方根(RMSEP)分别为0.4108(%),1.9144(%)和2.5319(%)。研究表明基于近红外光谱的蜂蜜主要成分快速无损检测准确度高,具有很高的实用价值。
文摘目的:建立蜂蜜中主要成分含量的快速测定方法。方法 :以不同生产基地的蜂蜜样品为研究对象,利用傅立叶近红外光谱仪采集蜂蜜的透反射光谱,并应用近红外定量分析技术进行了蜂蜜中主要成分(水分、果糖、葡萄糖和还原糖)的含量检测研究。用偏最小二乘法(Partial Least Squares,PLS)分别建立了蜂蜜水分、果糖、葡萄糖和还原糖的近红外定量分析模型。结果 :蜂蜜中水分、果糖、葡萄糖和还原糖定量模型的相关系数(r)分别达到0.997 25,0.973 90,0.927 94和0.952 68,预测误差均方根(Root Mean Square Error of Prediction,RMSEP)分别为0.165%,0.564%,1.300%和1.270%。结论:应用近红外光谱技术对蜂蜜的主要成分进行快速无损测定具有较高精确度,该方法可用于蜂蜜主要成分的定量检测。