Vitamin C DCPIP Quiz

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Vitamin C DCPIP test facts

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'AATHIRAH MASSARAH AHMAD SAHIMI

Malaysia

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Vitamin C DCPIP Quiz


Vitamin C DCPIP QuizVersion en ligne Vitamin C DCPIP test facts par 'AATHIRAH MASSARAH AHMAD SAHIMI 1 What color is DCPIP solution before reduction by vitamin C? a Colorless b Blue c Yellow d Green 2 What happens to DCPIP when vitamin C is present in the sample? a It is oxidized and turns red b It is reduced and becomes colorless c It turns green from blue d It remains blue 3 Which instrument is commonly used to quantify the vitamin C content in DCPIP assays? a pH meter b Balance c Thermometer d Spectrophotometer 4 What is the purpose of using a blank in the DCPIP assay? a Add vitamin C to start the reaction b Calibrate zero absorbance c Measure pH d Set the color to blue 5 Which factor can falsely lower the apparent vitamin C content in a sample? a Vitamin C stability b Other reducing agents present c Water content only d Temperature alone 6 What indicates the reaction is complete in a DCPIP assay? a Color change from blue to colorless b DCPIP disappears entirely c DCPIP turns red d No change in color 7 What unit is commonly used to report vitamin C content in foods? a g per serving b mg per L c IU d mg per 100 g 8 How can sample preparation affect assay accuracy? a Using whole fruit without juice b Using hot water only c Not homogenizing d Proper dilution to fit the standard curve 9 Why is the DCPIP test considered a colorimetric method? a It relies on a color change to indicate concentration b It requires fluorescence data c It measures pH only d It uses radioactive labels 10 Which form of vitamin C is being measured by the DCPIP assay? a Ascorbic acid (ascorbate) b Beta-carotene c Vitamin K d Vitamin E Feedback 1 Blue DCPIP is reduced by vitamin C, causing a color change. 2 Vitamin C reduces DCPIP, changing it from blue to colorless. 3 A spectrophotometer measures absorbance changes during the reaction. 4 The blank sets a baseline so absorbance is measured correctly. 5 Other reducing substances can also reduce DCPIP, skewing results. 6 Completion is shown by the blue dye turning colorless as it’s reduced. 7 Most nutritional data express vitamin C as milligrams per 100 grams. 8 Samples must produce readings within the standard curve range for accuracy. 9 Concentration is inferred from the observed color change of DCPIP. 10 The assay targets ascorbic acid as the reducing agent.

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Vitamin C DCPIP Quiz

Test

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Vitamin C DCPIP QuizVersion en ligne

par 'AATHIRAH MASSARAH AHMAD SAHIMI

What color is DCPIP solution before reduction by vitamin C?

What happens to DCPIP when vitamin C is present in the sample?

Which instrument is commonly used to quantify the vitamin C content in DCPIP assays?

What is the purpose of using a blank in the DCPIP assay?

Which factor can falsely lower the apparent vitamin C content in a sample?

What indicates the reaction is complete in a DCPIP assay?

What unit is commonly used to report vitamin C content in foods?

How can sample preparation affect assay accuracy?

Why is the DCPIP test considered a colorimetric method?

Which form of vitamin C is being measured by the DCPIP assay?

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