ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Protein content is one of the most important quality indicators of milk. The traditional methods used to measure protein content in milk have high precision, but the measurement procedures are tedious and timeconsuming, and the measurement equipments are expensive. In addition, these methods can not be used in field or insitu measurement. Therefore, developing a kind of portable milk protein content detector with simple operation and low cost, which could be used insitu measurement, would be appreciated by milk producers, processers and consumers. Since the hydrophobic grouping of Coomassie brilliant blue G-250 has strong affinity for protein in acids, a portable milk protein content detector was developed based on light transmission. The hardware of the detector consisted of the modules of single chip microcomputer, light source, light sensor, input/ouput and power. The software was developed by C51 language, and was made up of main function and several subfunctions to realize light collection, data preprocessing, protein content calculation and display. Raw fresh milk was used to study the relationship between intensity of transmitted light and protein content. It was found that the intensity of transmitted light was decreased with the increase of protein content, and they had strong linear relationship with the coefficient of determination of 0.872. The validation experiment on the developed detector showed that contrasted with Kjeldahl method, the absolute measurement error of the developed detector was within the range of ±0.08g/(100g), and its mean absolute error was 0.05g/(100g). In addition, the measurement result could be given in 2s.