Vinegar/sensory testing

Vinegar also accounts for a significant proportion in the inspection of seasonings in China. Food inspection involves many inspections, including sensory inspection, product sampling, and quality sampling. The training for daily seasoning food inspection workers in enterprises involves students' familiarity with product inspection methods such as observing color and smelling, as well as mastering some skills to meet the requirements of rapid inspection. Sensory Detection of Vinegar and Free Mineral Acid Detection 1. Sensory Detection of Vinegar: Take 0.8mL of vinegar into a 10mL colorimetric tube, add water to the mark, and shake without turbidity or sedimentation. Take 30mL of sample and observe it in a transparent container. There should be no suspended solids or mold floating film, and no "vinegar eel" or "vinegar louse". Taste without any odor. 2、 Detection of free mineral acids in vinegar: 1. Detection significance: There have been incidents of vinegar being contaminated with free mineral acids (hydrochloric acid, sulfuric acid, oxalic acid, etc.) in the past. Principle of Method 2: Free mineral acid shows purple spots on thymol blue test paper, which can turn methyl violet test paper blue or green. 3 test materials: thymol blue test paper and methyl violet test paper. 4. Operation method and result judgment: 1. Take a small sample of a thin glass rod or capillary tube and apply it to a thymol blue test paper. Within 10 minutes, if there are purple spots or rings (light purple inside the ring) at the sampling point, it will be a positive result, and yellow or white inside the ring will be a negative result. 2. Take a methyl violet test paper and directly dip it into the sample. If the test paper turns blue or green, it indicates a positive result. When both test strips are positive, it can be determined that the sample contains free mineral acid. The determination of total acid in vinegar indicates that this method is suitable for on-site rapid detection of total acid in vinegar. The principle is that the main component in vinegar is acetic acid, which contains a small amount of other organic acids. Titrate with sodium hydroxide standard solution and display the endpoint with an indicator to determine the total acid content in the sample. You can quickly test the total acid of the product and determine the results. 1、 Method of determining vinegar acid: Take 1.0mL of sample into a 10mL colorimetric tube, add water to the 10.0mL mark, cover, and mix well. Take 1.0mL from it and place it into another colorimetric tube or test tube, add 4 drops of indicator, and titrate with sodium hydroxide standard solution. Shake each drop of solution several times until the solution turns purple red (dark vinegar turns brownish red). Stop titration. Simultaneously perform a reagent blank test (i.e. take 1.0mL of water and titrate with sodium hydroxide standard solution). Result calculation: With the same sampling amount, each drop of sodium hydroxide standard solution is equivalent to 0.36% grams of total acid. The total acid content can be calculated based on the number of drops of sodium oxide standard solution used. 2、 Attention: When the results measured by this method differ by only 1 drop from the national standard value or the sample label value, the presence of on-site operational errors should be considered. For samples that do not meet the standard, they should be sent to the laboratory for precise quantification. 2. Pay attention to the upright position of the dropper bottle during titration to reduce errors

Function of testing report:

1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report

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3. Used as a sales report: issuing legally effective testing reports to make consumers more confident

4. Papers and research: Provide professional personalized testing needs

5. Judicial services: providing scientific, fair, and accurate testing data

6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

BAIJIAN testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Our Competitive Edge:

1. The testing industry is fully covered, meeting different testing needs

2. Fully cover the laboratory and allocate localized testing nearby

3. Engineers provide one-on-one services to make testing more accurate

4. Free initial testing, with no testing fees charged

5. Self service order delivery for free on-site sampling

6. Short cycle, low cost, and attentive service

7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China