L-ascorbic acid detection

This standard specifies the general principles and specific analytical methods for general analysis of beverages. This standard is applicable to the analysis of specific components in beverages. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. All dated references, subsequent amendments (excluding corrected content), or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. The latest version of any referenced document that does not indicate the 8th issue is applicable to this standard. GB/T601 Preparation of Standard Titration Solutions for Chemical Reagents GB/T 6682 Specification and Test Methods for Analytical Laboratory Water (GB/T 6682-2008, ISO 3696: 1987. M0D) GB 10789 General Principles for Beverages 3 General 3.1 The terminology and measurement units used in this standard should comply with the relevant national standards. 3.2 The "instrument" in this standard is a necessary instrument for analysis, and commonly used laboratory instruments and equipment are not listed item by item. 3.3 The water used in this standard should comply with the specifications for Grade III or above water in GB/T 6682 unless other requirements are specified. The reagents used refer to analytical reagents unless other specifications are specified. 3.4 "Solution" in this standard refers to aqueous solution unless otherwise specified. 4 Method for determining soluble solids in beverages (refractometer method) 4.1 Scope of Application: This method is applicable to transparent liquids, semi viscous beverages, and beverage products containing suspended solids. 4.2 Method principle: Measure the refractive index of the sample solution to be tested using a refractometer at 20C, and use Table A.1 to obtain or directly read the soluble solid content from the refractometer. 4.3 Commonly used instruments in the laboratory and the following instruments: 4.3.1 Abbe refractometer or other refractometer: measurement range 0%~80%, accuracy ± 0.1%, and 4.3.2 tissue crusher. 4.4 Preparation of test solution 4.4.1 Transparent liquid products. Mix the sample thoroughly and directly measure it. 4.4.2 Semi viscous products (such as fruit pulp and vegetable pulp). Mix the sample thoroughly and use four layers of gauze to squeeze out the filtrate. Discard the first few drops. Collect the filtrate for testing. 4.4.3 Products containing suspended solids (fruit juice drinks) Place the sample to be tested in a tissue crusher and crush it. Use four layers of gauze to squeeze out the filtrate. Discard the first few drops and collect the filtrate for testing. 4.5 Analysis Step 4.5.1 Before measurement, calibrate the refractometer according to the instructions. Take Abbe refractometer as an example, and operate other refractometers according to the instructions

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