Staphylococcus xylosus a2 can convert metmyoglobin to produce new uses of nitrosomyoglobin

Abstract

The invention provides novel application of staphylococcus xylosus A2 in conversion of metmyoglobin into nitrosomyoglobin, which belongs to the technical field of food science / meat science and relates to application of the staphylococcus xylosus A2. Substitution of addition of nitrite into a meat product with microbial fermentation belongs to a brand new research field; the invention provides a staphylococcus xylosus A2 stain capable of converting metmyoglobin into nitrosomyoglobin, the strain can convert metmyoglobin into nitrosomyoglobin, i.e., a red pigment for salted meat, in an MSA medium, so a feasible approach is provided for substitution of addition of nitrite into the meat product with microbial fermentation. The staphylococcus xylosus A2 is capable of converting metmyoglobin into nitrosomyoglobin, i.e., the red pigment for salted meat. Thus, fermentation by the staphylococcus xylosus A2 is used to replace addition of nitrite into the meat product for color generation, the usage amount of nitrite is decreased, and potential oncogenicity of the meat product is reduced.

Description

technical field [0001] The invention belongs to the field of food science / meat science and technology, and relates to the use of Staphylococcus xylosus A2, in particular to the new use of Staphylococcus xylosus A2 which can convert metmyoglobin to generate nitrosomyoglobin. Background technique [0002] Color is one of the important criteria to measure the quality of meat and meat products. The color of meat is mainly determined by the amount of myoglobin in it and its state. Ground state myoglobin (Myoglobin, Mb) (Fe in the porphyrin ring 2+ ) does not bind any subunits, but binds to water molecules. In the presence of oxygen, myoglobin can combine with one molecule of oxygen to form oxymyoglobin (MbO 2 ), which turns bright red. At this time, iron is still in the form of divalent iron ions (Fe 2+ )exist. But oxygen and other oxidizing agents will degrade the two. Valence iron is oxidized to ferric iron, and finally forms metmyoglobin (Metmyoglobin, Met-Mb), which is...

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Problems solved by technology

However, its application is limited due to its own toxicity and potential carcinogenicity

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