Sigma Reference Standards. A reference standard i e primary standard may be obtained from the usp nf or other official sources e g cber 21 cfr 610 0. Nmr reference standard 0 05 in benzene d 6 99 6 atom d nmr tube size 5 mm 8 in nmr tube wall thickness 0 24 mm ultra thin wall.
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Usp reference standards impacted by general chapter 11 reference standards and general notices 5 80 revisions official november 1 2020 usp currently offers more than 3 500 reference standards highly characterized specimens of drug substances excipients food ingredients impurities degradation products dietary supplements compendial.
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