CERTIFICATION OF FAT-SOLUBLE VITAMINS, CAROTENOIDS, AND CHOLESTEROL IN HUMAN SERUM - STANDARD REFERENCE MATERIAL 968B

In Standard Reference Material 968b, fat-soluble vitamins and choleste rol in human serum, certified values are provided for cholesterol, ret inol, retinyl palmitate, alpha-tocopherol, trans-beta-carotene, total beta-carotene (trans plus cis isomers), total alpha-carotene, and lute in. Non-certified values are also reported for gamma-tocopherol (inclu des beta-tocopherol), delta-tocopherol, zeaxanthin, beta-cryptoxanthin , trans-lycopene, trans-lycopene, trans-alpha-carotene, total lycopene , 9-cis-beta-carotene, 13-plus 15-cis-beta-carotene, and 15-cis-beta-c arotene. Both certified and non-certified values are based on the agre ement among results from three different liquid chromatographic analyt ical procedures developed at NIST and from an interlaboratory comparis on exercise among institutions that participate in a NIST-managed Micr onutrients Measurement Quality Assurance Program. Cholesterol is certi fied in this material using the NIST isotope dilution/mass spectrometr ic definitive method.