Organic modification of nano-SiO2 particles was performed with supercritical CO2 as solvent and a titanate coupling reagent NDZ-201 as the modification reagent. The surface of the nano-SiO2 particles was changed after modification by the titanate coupling reagent from hydrophilic to hydrophobic. IR and thermo-gravimetric analyses indicate that the interaction between the titanate coupling reage...

Objective: The study aimed to develop a simple, efficient, inexpensive, rapid, and reproducible spectrophotometric analytical technique for aminoglycosides analysis by condensing with ninhydrin reagent. Methods: At pH of 8.0, different aminoglycosides, including amikacin, gentamycin, neomycin, streptomycin, were deaminated the working standard solution each component was accurately placed into ...

CLINICAL CHEMISTRY, Vol. 33, No. 1, 1987 189 tubes containing 200 ML of 0.6 mol/L HC1O4; thus deproteinization was instantaneous. The tubes were centrifuged within 1 h and the clear protein-free supernate was stored at 4 #{176}C until assayed. Such deproteinized samples were stable for at least two months at 4 #{176}C and were analyzed without prior neutralization. Lactate was measured with an ...

A one-pot three-component route for the synthesis of S-trifluoromethyl dithiocarbamates by the reaction of secondary amines, carbon disulfide and Togni's reagent is described. The reactions proceed in moderate to good yields. A similar reaction using a primary aliphatic amine afforded the corresponding isothiocyanate in high yield. A variable temperature NMR study revealed a rotational barrier ...

background: during the last twenty years, the extraction of specific egg yolk (igy) antibodies from the immunized chickens has been accepted as a useful alternative to the immunization of mammals. the aim of the present study was immunizing the chickens with human umbilical cord serum (hucs) and the extraction of specific anti-human globulins (igg, c3b, and c3d) antibodies from egg yolk in orde...