RP4 - Food tests - AQA Biology GCSE

Sep 5, 2026

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Flashcards for AQA Biology GCSE RP4: Food tests, focusing on practical preparation and identification of key nutrients. The material outlines how to prepare a food sample by grinding, mixing with water, and filtering, then applies chemical tests to detect starch, reducing sugars, and proteins. It specifies iodine testing with a brown-to-blue-black colour change for starch, Benedict’s reagent boiling for reducing sugars producing a brick-red precipitate, and Biuret reagent for proteins turning the solution from blue to purple. Lipid testing is referenced as the next nutrient topic.

LanguageEnglish

CategoryExam

FormatPDF

Pages11

Reading Time28 min

AccessFree to download

RP4 - Food tests

Preparing a food sample

Testing for starch

Testing for reducing sugars

Testing for protein

Testing for lipids

FAQs

How should a food sample be prepared for testing?

Grind the food sample using a pestle and mortar, mix with water, and then filter using a funnel and filter paper.

What colour change indicates starch is present?

Add iodine solution; if starch is present, the solution turns from brown to blue-black.

What result indicates reducing sugar is present using Benedict’s reagent?

Boil the test tube in a hot water bath; if reducing sugar is present, a brick-red precipitate forms, otherwise the solution remains blue.

Sep 5, 2026

Upload by Mason