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Heated Canned Foods

Heated Canned Foods
High acid foods with a pH above 5.3 are especially subjected to

both (a) and (b)
flat sour spoilage
TA spoilage
putrefaction

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Heated Canned Foods
Acid foods with a pH between 4.5 and 3.7 usually are spoiled by

Saccharolytic anaerobe
B. coagulans
none of these
both (a) and (b)

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Heated Canned Foods
Canned meat and fish exhibit spoilage by

both (a) and (b)
Bacillus species
Clostridium species
Saccharomyces

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Heated Canned Foods
The putrifactive anaerobes grow best in the

any of these
low acid canned foods
medium acid canned foods
high acid canned foods

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Heated Canned Foods
The canned acid foods such as pineapple, tomatoes and pears have been found spoiled by C. pasteurianum. Such spoilage is more likely when the pH of the food is

<5.3
>4.5
<4.5
>5.3

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Heated Canned Foods
The most important kind of chemical spoilage of canned foods is the hydrogen swell which is favored by

imperfection in the tinning and lacquering
all of these
increasing acidities of foods
increasing temperature of storage

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