5 '- Guanylate Disodium/Food Additive Detection

The water used in this experiment, unless otherwise specified, refers to water that meets the GB/T 6682 Analytical Laboratory Water Specification and Test Method Level 1. The reagents used in this test method, when not specified in specifications, refer to analytical reagent (AR). If there are special requirements, they must be clearly specified. When specifying the solvent to be used for preparation, the solution of the wooden laboratory refers to an aqueous solution. 5.1 Sensory indicators should be taken from the most suitable sample and placed in a clean and dry white porcelain plate. Observe its color under natural light. Smell its scent. 5.2 Containing 5.2.1 Instrument UV spectrophotometer. 5.2.2 Reagent and solution Hydrochloric acid solution (0.01mol/L): prepared according to GB/T603. 5.23 Analysis Step 5.2.3.1 Preparation of Sample Solution) Weigh 0.5g of the sample (accurate to 0.1mg), dissolve the Chuan Hydrochloric Acid Bath Solution (5.2.2) and bring it to 1000ml, shake well. b) Absorb 10mL of the solution (a). Release with salt solution (5.2.2) and bring to a constant volume of 250mL Mix well and use as a backup sample solution. 5.2.3.2 Determination. Inject the sample solution (5.23.1 b) into a 10mm quartz colorimetric cup. Using hydrochloric acid solution (5.22) as a blank, measure the absorbance at 260nm on the UV spectrophotometer. 5.2.4 Calculation of 5 '- guanosine acid: Sodium content is calculated according to formula (1):

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