1-Oxa-8-azaspiro[4.5]decane-8-

Quantitation of Cocaine, Benzoylecgonine, Ecgonine Methyl Ester, and Cocaethylene in Urine and Blood Using Gas Chromatography-Mass Spectrometry (GC-MS

, benzoylecgonine-d3, ecgonine methyl ester-d3, and cocaethylene-d3 and buffered with phosphate buffer. The drugs in the sample are extracted by cation-exchange solid phase extraction. The drugs from the solid phase cartridge are eluted and the eluent is dried

Determination of Sulfur Amino Acids, Glutathione, and Related Aminothiols in Biological Samples by Gas Chromatography with Flame Photometric Detection

-4-sulfonate (15 ,16 ), methyl 4-(6-methoxynaphthalene-2-yl)-4-oxo-2-butenoate (17 ), N-(1-pyrenyl)maleimide (18 ), monobromobimane (19 –23 ), o -phthaldialdehyde (24 ,25 ), 9-fluorenylmethyloxycarbonyl chloride (26 ), and 2-chloro-1-methylpyridinium

Enzymes Acting on d-Amino Acid Containing Peptides

aminopeptidase and endopeptidase activities. The enzyme was active toward (d -Phe) n , Boc-(d -Phe) n , (d -Phe) n methyl ester, d -Phe-NH2 , Boc-(d -Phe) n methyl ester, and Boc-(d -Phe) n tert -butyl ester, but not toward (d -Ala) n (n = 2–4), (d