As a method of sterilizing milk, it can kill pathogens that are harmful to health and make milk quality change as little as possible. That is, according to the principle of the difference between the heat lethal curve of the tuberculosis which is extremely resistant to high temperature and the heat separation curve of the cream which is susceptible to heat in the milk, the heat treatment is performed at a low temperature for a long time or at a high temperature for a short time. method. Among them, the method of heating at 60 ° C or lower for 30 minutes has been widely used as a standard for low-temperature sterilization. The use of high temperature treatment, although somewhat affecting the milk quality, can enhance the sterilization effect. This method is called sterilization, that is, heating at 95 ° C or higher for 20 minutes. In addition to milk, the pasteurization method can also be applied to fermentation products, food sterilization after vacuum packaging, and the like.
Typically, bagged milk sold on the market is produced by pasteurization. Fresh milk is collected from the factory, first treated at low temperature and then sterilized by pasteurization. Bagged milk produced in this way can usually be stored for a longer period of time. Of course, the specific process and process are much more complicated, but the general principle is this.
It should be pointed out that drinking fresh milk (referred to as milk that has just been squeezed out) is not safe because it may contain bacteria that are harmful to our body. Another point is that pasteurization is not a panacea. The pasteurized milk is still stored at a lower temperature (generally <4 °C), otherwise there is still the possibility of deterioration. Therefore, many methods of selling bagged milk on the market are very irregular.
Pasteurized milk is the world's most consumed milk. The consumption of pasteurized milk in the United Kingdom, Australia, the United States, Canada and other countries accounts for more than 80% of liquid milk. The varieties are fully degreased, semi-skimmed or fully fat. In the US market, it is almost all pasteurized milk, and it is a large package (1 liter, 2 liters, 1 gallon). The public buys enough milk for one week at a supermarket. There are very few sterilized pure milk sold in the market, and some small towns cannot buy them at all.
Pasteurized pure milk better preserves the nutrition and natural flavor of milk, and is a good one among all milk varieties. In fact, as long as the pasteurized milk is stored at a temperature of about 4 ° C, the reproduction of the bacteria is very slow, and the nutrition and flavor of the milk can remain unchanged for several days.
Rhodium powder Rh≥99.95% Properties: silver-white metal, extremely hard, wear-resistant, also has considerable ductility Application: It can be used as raw material for electrical instrumentation, chemical industry and manufacture of precision alloys. Rhodium powder is based on the widespread use of ruthenium in the industrial industry. Since rhodium is a rare metal required by the industry, the industry price is slightly higher than that of general non-ferrous metals. Rhodium, one of the rare elements, has various uses. Rhodium can be used to make hydrogenation catalysts, thermocouples, platinum-rhodium alloys, etc. It is also often plated on searchlights and reflectors, and is also used as a polishing agent for gemstones. and electrical contact parts.
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