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14 Questions

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Short Chain Organic Acids in Food

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Questions and Answers

How do short chain organic acids inhibit microorganism growth?

By facilitating the transport of metabolites into the cell

By promoting the regeneration of ATP by uncoupling the electron transport system

By increasing the production of ATP

By altering the structure of the cell membrane (correct)

At what pH is acetic acid effective against various bread molds?

pH 9.0

pH 5.0

pH 7.0

pH 3.5 (correct)

Which of the following microorganisms is acetic acid an effective inhibitor of in baked goods?

Streptococcus pyogenes

Bacillus subtilis (correct)

Escherichia coli

Aspergillus niger

What is the primary reason for acetic acid's antimicrobial activity variation?

Food product Signup and view all the answers

What is the main use of lactic acid as a food additive?

To inhibit the growth of Bacillus coagulans in tomato juice Signup and view all the answers

What is the main function of fumaric acid esters in tomato juice?

Inhibiting mold growth Signup and view all the answers

Why are propionates used as an antimicrobial agent?

To inhibit mold growth on bread Signup and view all the answers

What is the primary antimicrobial activity of citric acid?

Chelating metal to inhibit microbial growth Signup and view all the answers

Which acid is most effective in inhibiting the growth of Bacillus coagulans in tomato juice?

Lactic Acid Signup and view all the answers

What is the primary use of fumaric acid in fermented products?

Preventing malolactic fermentation in wine Signup and view all the answers

Why are propionic acid and its salts used as antimicrobial agents?

To inhibit spore forming organism Bacillus subtilis Signup and view all the answers

What is the effect of citric acid on Salmonella?

It inhibits Salmonella growth more effectively than lactic and hydrochloric acids Signup and view all the answers

What makes propionates more active against molds than sodium benzoate?

Accumulates in the cell and inhibits the enzymes involved in metabolism Signup and view all the answers

What makes lactic acid four times as effective as other acids in inhibiting the growth of Bacillus coagulans in tomato juice?

Competes with alanine and other amino acids necessary for the multiplication of microorganisms Signup and view all the answers