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Polyacrylates (sheets), propylene glycol (film), silica gel (sachet) acts as _______ scavenging system.

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Polyacrylates (sheets), propylene glycol (film), silica gel (sachet) acts as _______ scavenging system.

(a) oxygen

(b) carbon dioxide

(c) ethylene

(d) moisture

The question was posed to me in an international level competition.

This key question is from Active Packaging in Food in chapter Modern Packaging Techniques of Food Packaging Technology

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The correct answer is (d) moisture

To elaborate: Polyacrylates (sheets), propylene glycol (film), silica gel (sachet) acts as moisture scavenging system. Lower the water activity of the product, lower is the microbial growth. This system consists of a super absorbent polymer located between two layers of a micro-porous or non-woven polymer. This results in enhanced product appearance and freshness.

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