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Scope This standard specifies the liquid chromatography method for the determination of lutein in food This standard is applicable to the liquid chromatography determination of lutein in infant formula milk powder, dairy products, frozen beverages, rice flour products, baked goods, jam, jelly, and beverages Principle Foods with high fat content (fat content not less than 3% on a dry basis) are saponified with potassium hydroxide solution at room temperature to free lutein. Then, they are extracted with ether n-hexane cyclohexane (40+40+20, volume ratio), separated by liquid chromatography, detected by UV detector or diode array detector, and quantified by external standard method Other foods directly extract lutein from the sample with ether n-hexane cyclohexane (40+40+20, volume ratio). The extraction solution is purified by a neutral alumina solid-phase extraction column, separated by liquid phase chromatography, detected by UV detector or diode array detector, and quantified by external standard method Function of testing report:1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report 2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 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 problems100% inspection and 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 requiredTesting and testing characteristics:1. The testing industry is fully covered, meeting different testing needs 2. Fully cover the laboratory and allocate localized testing nearby3. 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
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