• The possibility of acid is important for the type and quantity of the m.o of spoilage. • Fruit and vegetable pH <• Damage from yeast and fruit are often moldy.• Vegetable waste from bacteria more chance -Fish spoilage than beef, because the pH Of meat after the rigor have pH ~ 5.6. Lower (6.2-6.5). • Meat slaughter animals, while the fatigue will have a shelf life shorter than the rest of the meat of animals due to the decrease in pH is less than normal. • Animal health There is a 1% glycogen after the animals died. Lactic acid glycogen changed to pH 7.4 neg. is 5.6.Rigor mortis occurs: • after -Beef pH 5.1-6.2 -Lamb pH 5.4-6.7 -Pork meat pH 5.3-6.9pH and Microbial Growth• PH affect the microorganisms in the -The function of enzymes -The transport of nutrients into the cell. Cell membrane is quite unwilling to H + and OH-out so the concentration in cytoplasm is constant even though the pH around cells.• pH in a food is reduced below the lower limit for growth of a microbial species, the cell not only stop growing but also lose viability. • Weak acids that have higher dissociation constant (pKa), such as acetic acid (pKa 4.8) vs. lactic acid (pKa 3.8) cause a reduction in internal pH. • 4.Oxidation-Reduction Potential (O/R, Eh)• Principle -Oxidation Reduction or Redox is a substance (substance), or electronic khotron. -The reaction is called oxidation, ē. -The reaction with ē called the reduction
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