Bacto-peptone
Generally, peptone is obtained by digesting animal tissues with pepsin or trypsin. Currently the most used bovine peptone.
Casein peptone
Also known as: casein, casein, milk casein, tryptone.
It is a peptone obtained by hydrolyzing casein with trypsin. It has relatively complete amino acids, especially a relatively high content of tryptophan. It is suitable for indigo matrix and sugar fermentation experiments, but it lacks sulfur-containing amino acids such as cystine and methionine, so it is not suitable for use. in the hydrogen sulfide test. Casein is a phosphorus-calcium-binding protein that is acid-sensitive and precipitates at lower pH. Casein is the major protein in mammalian milk, including bovine, ovine, and human.
Polyvalent peptone
Peptone is a mixture of equal amounts of casein peptone and bacto-peptone. Suitable for general bacterial culture and reproduction.
Beef peptone
Peptone obtained from trypsin digestion of fresh beef. Rich in amino acids, growth-promoting factors, etc., the nutritional content is higher than that of bacto-peptone.
Peptone
The product of low-level digestion of casein by trypsin can be partially precipitated by ammonium sulfate. Rich in a large number of low molecular weight peptides, free amino acids and growth-promoting factors, without para-aminobenzoic acid, it is suitable for the preparation of bacterial toxin-producing media.
Soy peptone
It is a hydrolyzate obtained by papain digestion of soybean flour, which is high in vitamins, especially thiamine (vitamin B1), and contains a lot of carbohydrates. It is an excellent peptone without animal origin, suitable for fungi and many nutritional requirements Bacteria with high concentration are not suitable for microbial sugar alcohol fermentation test. Generally, it works better when mixed with other types of peptones.
Acid Hydrolyzed Casein
It is a white or light yellow powder made of high-quality casein as raw material, deeply hydrolyzed with strong acid, decolorized, desalted, concentrated, and spray-dried. Most of the vitamins are hydrolyzed by strong hydrochloric acid, lacking cystine and tryptophan. It is suitable for the medium for drug susceptibility test and the medium for vitamin determination by microbiological method.
Gelatin peptone
It is a product of trypsin hydrolysis of gelatin. Low in cystine and tryptophan, no carbohydrates. Especially suitable for microbial sugar alcohol fermentation test.