In an attempt to improve the bacteriological quality of raw pork Longissimus dorsi mince meat, without adversely affecting the
odour, colour and texture, the meat surface was treated with individual solutions of propionic acid and ascorbic acid, and a
combination of the two acids, at concentrations that had a preservative effect. A water-treated sample was used as the control.
Bacterial colonization was determined over a 13 d refrigerated (4 °C) storage period. Propionic acid at 0.133 mol/L reduced the
pseudomonad count by 3 log10 cfu/g over this period, whereas 0.41 mol/L propionic acid reduced pseudomonad counts by 8
log10cfu/g. Combinations of ascorbic and propionic acid solutions were effective in reducing the microbial load of the minced
pork.
Headspace volatiles from untreated and treated minced pork were trapped on Tenax and analysed by GC-MS. Greater amounts
of lipid oxidation were found in all acid-treated meats (apart from ascorbic) relative to the water-treated control sample.
Meat colour was best preserved when ascorbic acid was present. Minced pork treated with solutions of propionic acid showed
surface bleaching and an increase in lipid oxidation volatiles when compared with the control. All acid treatments decreased the
water-holding capacity of the meat.
In an attempt to improve the bacteriological quality of raw pork Longissimus dorsi mince meat, without adversely affecting theodour, colour and texture, the meat surface was treated with individual solutions of propionic acid and ascorbic acid, and acombination of the two acids, at concentrations that had a preservative effect. A water-treated sample was used as the control.Bacterial colonization was determined over a 13 d refrigerated (4 °C) storage period. Propionic acid at 0.133 mol/L reduced thepseudomonad count by 3 log10 cfu/g over this period, whereas 0.41 mol/L propionic acid reduced pseudomonad counts by 8log10cfu/g. Combinations of ascorbic and propionic acid solutions were effective in reducing the microbial load of the mincedpork.Headspace volatiles from untreated and treated minced pork were trapped on Tenax and analysed by GC-MS. Greater amountsof lipid oxidation were found in all acid-treated meats (apart from ascorbic) relative to the water-treated control sample.Meat colour was best preserved when ascorbic acid was present. Minced pork treated with solutions of propionic acid showedsurface bleaching and an increase in lipid oxidation volatiles when compared with the control. All acid treatments decreased thewater-holding capacity of the meat.
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