Orthophthalaldehyde | Article about orthophthalaldehyde by The Free Dictionary
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OPA: see Office of Price AdministrationOffice of Price Administration
(OPA), U.S. federal agency in World War II, established to prevent wartime inflation. The OPA issued (Apr., 1942) a general maximum-price regulation that made prices charged in Mar., 1942, the ceiling prices for most commodities.
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In a classical temple, a cavity which receives a roof beam.
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References in periodicals archive
 stated that precolumn derivatization such as orthophthalaldehyde
(OPA), naphthalene-2,3-dicarboxaldehyde, or 4-dimethylaminoazobenzene-4'-sulfonyl chloride (dabsyl chloride) was able to provide accurate and stable chromatography baseline, but the reactions were unstable and affected by the sample matrix .
Liver (50 mg) and plasma (50 [micro]L) levels of reduced glutathione (GSH) and oxidized glutathione (GSSG) were assayed separately according to the fluorometric orthophthalaldehyde
(OPT) method reported by Hissin and Hilf .
External standard materials used as derivative reagents included an amino acid standard, 0.25 mM/[micro]L (Agilent Technologies), and glutatmine (Signa Aldrich, USA), OPA (orthophthalaldehyde
) and FMOC