ASPECTS OF THE DESTRUCTIVE CHANGES IN THE MAIN NUTRIENTS OF CANNED MEAT IN PIECES «STEWED BEEF OF THE TOP GRADE» UNDER THE NON-NORMATIVE TEMPERATURE AND HUMIDITY CONDITIONS OF STORAGE

The scientifically substantiated and established temperature and humidity conditions of storage of sterilized canned meat are a temperature in a range from 0 to + 20 °С and the air relative humidity not more than 75%. However, in the harsh and extreme climate
conditions of the Russian regions, it is extremely difficult or practically impossible to ensure the normative temperature and humidity conditions when transporting canned foods to a consumer, as well as at short-term storage. Therefore, obtaining new experimental data on an effect of the non-normative temperature and humidity
conditions of the sterilized canned foods on the indicators of product safety and quality are topical and important for understanding the character and depth of the destructive processes occurring in a product.
It was noted that an abrupt change in the climatic conditions did not have a stimulating effect on microflora development in the tested samples. All samples were commercially sterile. The histological investigations proved an increase in the degree of muscle tissue destruction in the unregulated storage conditions: microfractures and narrow cross fractions had a multiple character, an amount of fine-grained proteinous mass  increased. It was established that freezing and subsequent storage had a stronger negative effect on the degree of protein destruction and aroma of the broth and meat of the canned foods compared to the unregulated temperature and humidity storage conditions. For example, the mass fraction of protein nitrogen and essential amino acids decreased on average by 7.8%. The preservation of the fatty constituent of the canned foods in the stably freezing condition was considerably higher than in case of alternating freezing and defrosting. The degree of a decrease in the sum content of monounsaturated fatty acids in the canned foods in the unregulated conditions
was on average more than 20%, those of polyunsaturated fatty acids was more than 31%. It was shown than freezing of canned food at stably low temperatures led to the most pronounced negative impact on the aroma of broth and meat. On average, the degree of the effect of the stably low temperatures was higher by 5.4% compared to the canned food stored in the unregulated temperature and humidity conditions.
The content of vitamins and accumulation of products of protein hydrolysis by the phases «pepsin-trypsin» in canned meat did not change in the studied time period.

canned foods, storage, unregulated conditions, protein destruction, fat preservation

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