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Food Dye Analysis by Visual Colour Comparison通过觉比色食品染料分析.doc

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Food Dye Analysis by Visual Colour Comparison通过觉比色食品染料分析

Food Dye Analysis by Visual Colour Comparison David Cash PhD david.cash@mohawkcollege.ca Mohawk College (retired) Article Content Introduction: Describes the analysis for the food dye red no. 40 by a visual colour comparison. Required Equipment and Supplies: The?only “chemicals” needed are Kool Aid and cough drops. You will not need distilled water. Instructions: The exercise can be completed in 30 to 40 minutes. Sample Calculations: Includes equations and worked examples. Additional Questions: Questions which may be used with students, depending on the grade level. Background: Theory and practical information about the exercise. Theory and Practice of the Method of Light Absorbance Allura Red (Red No. 40) and Cherry Kool Aid The Visual Colour Comparison Method Chemical Analysis in the Food Industry References: Links to web pages with support information. Summary This article presents a chemical analysis experiment - suitable for grades 7 and above - which is safe, simple, short, and inexpensive. Use it as a demonstration, a partially hands-on exercise, or as a fully independent activity for the students, depending on the grade level, the time available, and the desired outcomes. Introduction The quantity of a synthetic food dye in a cough drop may be determined using the human eye as an instrument - a procedure called visual colour comparison. The?exercise is safe, simple, short, and inexpensive, requiring no chemical reagents or complex equipment. It is an example of chemical technology, the application of chemical knowledge for a practical purpose. There are eight synthetic chemical food dyes allowed for use in Canada; the regulation of their use is contained in the Food and Drugs Act (1). One of the allowed food dyes is allura red (2,?3), also known as FDC Red?No.?40. Red no.40 is used in foods, medicines, and candies to achieve a cherry, raspberry, or strawberry-red colour. This dye is the major colour component in Cherry Kool Aid (4) and in Halls (5), Vicks (