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Which chemical is commonly used as a preservative in food?
Sodium benzoate
Sodium chloride
Acetic acid
Citric acid
Sodium benzoate
Sodium benzoate is widely used as a chemical food preservative, particularly in acidic foods, to inhibit the growth of microorganisms such as fungi and bacteria. It works most effectively in environments with a low pH.
Sodium benzoate is widely used as a chemical food preservative, particularly in acidic foods, to inhibit the growth of microorganisms such as fungi and bacteria. It works most effectively in environments with a low pH.
Think of sodium benzoate as an invisible chemical shield added to packaged foods, creating an acidic environment that stops microscopic molds and bacteria from multiplying.
C7тАЛH5тАЛNaO2тАЛ тАФ Chemical formula for sodium benzoate
C6тАЛH5тАЛCOOH тАФ Active antimicrobial form (benzoic acid)
When sodium benzoate dissolves in an acidic medium, it forms benzoic acid (C6тАЛH5тАЛCOOH). Undissociated benzoic acid can passively diffuse across the cell membrane of microbes. Once inside the neutral interior of the microbial cell, it dissociates, lowering the internal pH and disrupting vital metabolic processes, thereby halting microbial growth.
Sodium benzoate is the sodium salt of benzoic acid.
It is most effective as an antimicrobial agent in acidic products like fruit juices, soft drinks, and pickles.
It primarily prevents spoilage caused by mold, yeast, and certain bacteria.
Significantly extends the shelf life of processed and packaged foods.
Inexpensive and highly effective against fungi in acidic conditions.
Can react with ascorbic acid (vitamin C) in beverages to form trace amounts of benzene, a known carcinogen, under specific conditions.
Carbonated beverages and soft drinks
Fruit juices and salad dressings
Jams, jellies, and condiments
Sodium chloride is a traditional curing agent, acetic acid is found in vinegar, and citric acid primarily acts as an acidulant and flavor enhancer.
Option A is the standard chemical food preservative tested in standard Indian competitive examination questions.
A is correct тАФ Sodium benzoate is a primary chemical food preservative used to prevent microbial spoilage in acidic foods.
In competitive exams, remember that chemical preservatives like sodium benzoate are most active in acidic media because the undissociated form easily penetrates microbial cell walls.
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