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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.","# AQA Biology GCSE\n\nRP4 - Food tests  \nFlashcards  \nDescribe how you would prepare asample of food tobe tested  \nDescribe how you would prepare a sample offood tobe tested  \nGrind up food samples using pestle and mortarMix with water  \nFilter with funnel and filter paper  \nDescribe how you would test forthepresence of starch in a sample  \nDescribe how you would test forthe presenceof starch in a sample  \nAdd iodine solution to sample  \nIf starch is present, solution turns from brown toblue-black  \nDescribe how you would test forthe  \npresence of a reducing sugar in a sample  \nDescribe how you would test forthe presence ofa reducing sugar in a sample  \n## Add Benedict’s reagent to sample\n\nBoil test tube in a hot water bath  \nIf reducing sugar is present, a brick redprecipitate forms. If not, the solution remains blue  \nDescribe how you would test forthepresence of protein in a sample  \nDescribe how you would test forthe presence ofprotein in a sample  \nAdd Biuret reagent (potassium hydroxide and copper(II) sulphate)  \n## Shake mixture\n\nIf protein is present, solution turns from blue topurple  \nDescribe how you would test forthepresence of lipids in a sample","cbCaiqh6xsYYv01V","https://ap.wps.com/l/cbCaiqh6xsYYv01V","pdf",169208,1,11,"English","en",105,"# RP4 - Food tests\n## Preparing a food sample\n## Testing for starch\n## Testing for reducing sugars\n## Testing for protein\n## Testing for lipids","[{\"question\":\"How should a food sample be prepared for testing?\",\"answer\":\"Grind the food sample using a pestle and mortar, mix with water, and then filter using a funnel and filter paper.\"},{\"question\":\"What colour change indicates starch is present?\",\"answer\":\"Add iodine solution; if starch is present, the solution turns from brown to blue-black.\"},{\"question\":\"What result indicates reducing sugar is present using Benedict’s reagent?\",\"answer\":\"Boil the test tube in a hot water bath; if reducing sugar is present, a brick-red precipitate forms, otherwise the solution remains blue.\"}]","RP4 - Food tests - AQA Biology GCSE | PDF",1788602385,28,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":86,"head_meta":88,"extra_data":90,"updated_unix":28},"rp4-food-tests-aqa-biology-gcse","",{"@graph":36,"@context":85},[37,53,68],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/exam/",3,{"item":52,"name":13,"@type":43,"position":11},"https://docshare.wps.com/document/rp4-food-tests-aqa-biology-gcse/208085/",{"url":52,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":23,"description":14,"dateModified":61,"datePublished":62,"encodingFormat":60,"isAccessibleForFree":63,"interactionStatistic":64},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":41,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-07","2026-09-05",true,{"@type":65,"interactionType":66,"userInteractionCount":20},"InteractionCounter",{"@type":67},"ViewAction",{"@type":69,"mainEntity":70},"FAQPage",[71,77,81],{"name":72,"@type":73,"acceptedAnswer":74},"How should a food sample be prepared for testing?","Question",{"text":75,"@type":76},"Grind the food sample using a pestle and mortar, mix with water, and then filter using a funnel and filter paper.","Answer",{"name":78,"@type":73,"acceptedAnswer":79},"What colour change indicates starch is present?",{"text":80,"@type":76},"Add iodine solution; 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