Summary Expressed in lactic acid Still use this as one of the criteria for inclusion. If the raw milk in a certain area has a relatively consistent natural acidity level, it is considered acceptable. About Keywords Bovine lactate, Determination, Lactose measurement 1. Master the method of determining the lactate degree of cattle by electrochemical method 2. Understand the relationship between the freshness of milk and acidity Fresh milk has a certain acidity, which is mainly composed of acidic substances such as protein, citrate, phosphate, and carbon dioxide in milk. This acidity is not related to the acid produced by microbial activity during storage and is called natural acidity. There are two ways to express cow lactic acid: one is expressed as a percentage of lactic acid. The acidity range of fresh milk is usually around 0.15% to 0.20%. If the acidity exceeds this range, it may indicate that the milk is no longer fresh. True acidity refers to the acidity caused by the fermentation of lactose under the action of lactic acid bacteria. When the total acidity of the milk is higher than the normal range, it suggests that there is lactic acid present, which gives the milk a sour taste. This type of acidity is known as natural acidity. When milk is contaminated with bacteria, especially lactic acid bacteria, the lactose in the milk is broken down into lactic acid, increasing the acidity. This is referred to as fermentation acidity. The sum of natural acidity and fermentation acidity is called total acidity. When measuring acidity using titration, it's important to dilute the sample with distilled water first. This process is safe and widely applicable. However, using toxic reagents in titration can be dangerous and requires careful handling. Additionally, the process takes time, knowledge, and experience. Sugar acidity meters are easier to use, require only a few seconds, and can be operated by anyone. After titration, it’s also necessary to properly dispose of the used sample liquid and titration reagent. Acidity meters can measure the acidity twice, ensuring accuracy. Simply dilute the sample solution to the instrument prism and press the button. The acidity will be displayed on the screen instantly. Dell Certified Refurbished,Refurbished Dell Computers,Used Dell Computers,Used Dell Laptops For Sale Guangzhou Panda Electronic Technology Co., LTD , https://www.panda-3c.com