Shanghai Hengyuan Biological Technology Co., Ltd. is a professional agent of the four major brands of American Spectrum, Amresco, Sigma, Pharmacia, high-quality chemical reagents, a full range of products, the main categories are: amino acids, enzymes, proteins, antibiotics, carbohydrates, pigments Class, vitamins, surfactants, buffers, plant hormone nucleic acids and other biochemical reagents.
1. Classification of chemical reagents
According to the purity of chemical reagents, according to the content of impurities, we divide chemical reagents into four levels:
The first-level reagent (superior grade pure reagent) is usually expressed by GR.
Secondary reagents (analytical reagents) are usually expressed as AR.
Tertiary reagents (chemically pure) are usually expressed as CP.
Level 4 reagents (experimental or industrial reagents) are usually denoted by LR.
In addition, according to special work purposes, there are some special purity standards. Such as spectral purity, fluorescent purity, semiconductor purity, etc. Reagents with different specifications should be selected according to different experimental requirements. For example, in general inorganic experiments, three or four grade reagents can be used, and analytical experiments require the use of higher purity second or even first grade reagents.
Second, the packaging of chemical reagents
Solid reagents are generally packed in wide-mouth bottles with bakelite stoppers, and liquid reagents are contained in fine-mouth bottles (or drip bottles). Reagents that are easily decomposed by light (such as silver nitrate) should be packed in brown bottles. All reagents are labeled to indicate the name, concentration and purity of the reagents. (When the laboratory is dispensed, the solid only indicates the name of the reagent, and the liquid must also indicate the concentration). Shanghai Hengyuan biochemical reagents are mainly packaged in 5g / 25g / 100g / 500g / 1kg and so on.
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