Acetic acid, 2-(4-phenylcycloh

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

under the stream of nitrogen. The residue is incubated with pentafluoropropionic acid anhydride and pentafluoropropanol to form pentafluoropropionyl derivatives of ecgonine methyl ester and benzoylecgonine. Cocaine and cocaethylene are refractory to derivatization

Biotinylation of a Propargylated Cyclic (3′‐5′) Diguanylic Acid and of Its Mono‐6‐Thioated Analog Under “Click” Conditions

?cyanoethylthio group is effected by treatment with 2,4,6?triisopropybenzenesulfonyl chloride and triethylamine to give a 6?(2,4,6?triisopropylbenzenesulfonic acid) ester intermediate. Reaction of this key intermediate with 3?mercaptoproprionitrile

Preparation of Carboxypeptidase Y and Its Properties

through polyacrylamide gel electrophoresis. Carboxypeptidase Y possesses the activity of esterase and peptase that can be assayed using N-acetyl-L-tyrosine ethyl ester (ATEE) and benzyloxycarbonyl-L-phenylalanyl-L-leucine (CBZ-Phe-Leu) as substrates respectively