PQS MT2 Flashcards
What is produced during homofermentation?
Lactic acid
From which one do you not take 500 gram sample?
Fresh fruit
Which substances belongs to category A?
Chloramphenicol, anabolic agents
What is true for the spoilage flora?
Aerotolerant anaerob
Which heat treatment is not used to produce consumer milk?
Thermization
What is not produced during heterofermentation?
Malic acid
For which heat treatment are the phosphatase and peroxidase tests both positive?
Thermization
From which one do you take 500 gram sample?
Meat
On which pH is a certain acid most/less active?
Lowest/highest number
Which if these cannot be contaminated during the first phase of food production?
Milk poducts/sausage
What is the principle of testing for Peroxidase test (Storch test)?
Control of heat treatment, peroxidase decomposes at 80oC (e.g. flash pasteurization)
What is the Z-value?
Change in temperature, which results in a tenfold change in the Decimal reduction time (D)
What is the D?
The time for the (surviving) population to be reduced by 1 magnitude at a specified, constant temperature. Decimal reduction time (e.g. 107 – 106 = 1D)
Which milk product is made using thermofilic and mesophilic bacterias?
Yoghurt (acidified milk products fermented by thermophilic bacteria, origin from the Balkans)
Which test is suitable to examine the quality/originity of the milk?
Fourier transformation infrared spectroscopy, Milko-Scan. Eliminate need for traditional slow tests
For which heat treatment is phosphatase test negative and peroxidase test positive?
Pasteurization below 80oC
Which is made with mesophilic bacteria?
Curd, Kefir, Koumiss, Yoghurt
Which is made of mesophilic bacteria and yeasts?
Kefir, Koumiss
What do we detect with alcohol test?
When the milk is sour (increased SH), the colloidal system changes ➡ proteins precipitate by the effect of 68% alcohol
How do we detect milk falsification?
If foreign water is meant ➡ by determination of freezing point
Which test is based on microbiological inhibition?
Delvo test, Four-cup-plate, KIS test, Brilliant Black Reduction test
Which test is based on receptor reactions?
ROSA test, Snap test
In case of which food do they create the number of samples, based upon last years results?
Eggs
Which of the following is not measured in the mode of production?
Urine