摘要:

AbstractA kinetic method for the accurate and sensitive determination of famotidine has been described. The method is based on the alkaline oxidation of famotidine with potassium permanganate at a fixed time of 10 min. The formed manganate ion is measured at 610 nm. The concentration of famotidine is calculated using the calibration equation for the fixed time method. Beer's law was obeyed in the range of 1–10 μg/mL and the R.S.D. (n = 10) was 0.47%. The method has been applied successfully to commercial tablet dosage fo

ISSN:0009-4536    

DOI:10.1002/jccs.200500011

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractA new simple extractive spectrophotometric method has been developed for the determination of levofloxacin (I), norfloxacin (II), and ciprofloxacin (III) in pure form and tablets. The method is based on the formation of blue‐colored ion‐pair associates between the drugs and the inorganic complex, cobalt (II) thiocyanate, at pH 2.5. Those ion‐pair associates are readily extracted into an n‐butanol‐dichloromethane solvent mixture (3.5:6.5) and determined spectrophotometrically at 623 nm. The concentration range is 20–240 μg mL−1for the three studied drugs. The proposed method was successfully applied to determine these drugs in their tablet formulations, and the results are in good agreement with those obtained by the ref

ISSN:0009-4536    

DOI:10.1002/jccs.200500012

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractA commercialized cellulase fromTrichoderma reeseihas been successfully immobilized by using calcium alginate gel in our laboratory. The waste paper cellulose was hydrolyzed with a special design of the reactor to form a vertically hanging immobilized cellulase under the optimum conditions of pH 4.0 and 45 °C. Glucose, cellobiose and xylose are the major hydrolysis products. The glucose production from the hydrolysis with the vertically hanging immobilized cellulase was about 1.73‐fold better than the freely suspended immobilized cellulase. The average diameter of the immobilized cellulase pellets was 4.190 ± 0.291 mm. UV light irradiation deactivates the activity of the immobilized cellulase. The advantage of the vertically hanging immobilized cellulase reactor is an easy recycle and reuse of the immobilized cellulase. Washing and soaking the recycled immobilized cellulase with distilled water for one day can restore its activity to a small extent. Overall, the application of the hanging immobilized cellulase reactor for waste paper cellulose hydrolysis is success

ISSN:0009-4536    

DOI:10.1002/jccs.200500013

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractThe applicability and synthetic potency of the novel reagent diethyl 2‐aryl‐3‐phenylsulfonylpropen‐1,1‐dicarboxylate3is reported. Compound3proved to be a key precursor in heterocyclic sulfones syntheses. Chemical and spectroscopic evidence for the structure of the newly synthesized compounds are

ISSN:0009-4536    

DOI:10.1002/jccs.200500014

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractThe cyclization of 1‐amino‐2‐mercapto‐5‐[1‐(4‐ethoxyphenyl)‐5‐methyl‐1,2,3‐triazol‐4‐yl]‐1,3,4‐triazole which was synthesized fromp‐ethoxyaniline with various triazole acid in absolute phosphorus oxychloride yields 3,6‐bis(1,2,3‐triazolyl)‐s‐triazolo[3,4‐b]‐1,3,4‐thiadiazole derivatives9a˜j, and their structures are esta

ISSN:0009-4536    

DOI:10.1002/jccs.200500015

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

Abstract(Pyridine)(tetrahydroborato)zinc complex, (Py)Zn(BH4)2, as a stable modification of zinc borohydride can easily reduce a variety of aromatic and aliphatic aldoximes or ketoximes to their corresponding amines in high to excellent yields in refluxing THF.

ISSN:0009-4536    

DOI:10.1002/jccs.200500016

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractGrubbs' catalyst was used to prepare a series of carbosilane dendrimers with silacyclopentene peripheral groups, suitable for further elaboration to functional dendrimers. The efficiency of the ring closing metathesis reaction was found to be strongly dependent on the reaction temperature and the amount of catalyst used, as shown by1H NMR monitoring.

ISSN:0009-4536    

DOI:10.1002/jccs.200500017

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractPyrazolone, Isoxazolone, Pyrimidinone, Pyrimidinothione, thiazolidinone and β‐lactam incorporating 2‐oximino benzpyrid‐4‐one derivatives have been synthesized by cyclocondensation addition reaction and cycloaddition of hydrazine hydrate, phenyl hydrazine, hydroxylamine, urea, thiourea, mercapto acetic acid, and chloroacetylchloride, resp

ISSN:0009-4536    

DOI:10.1002/jccs.200500018

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractGeneral and practical method for the synthesis of silyl ethers in the presence of zinc powder under mild conditions has been described.

ISSN:0009-4536    

DOI:10.1002/jccs.200500019

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY

摘要:

AbstractA new series of anionic surfactants having double function as antimicrobial and surface active agents have been synthesized by reaction of 4(H)‐3,1‐benzoxazinone3and quinazolinethione10with nitrogen nucleophiles and activated olefinic compounds. The compounds were evaluated for their surface activity as well as the antimicrobial and biodegradability propert

ISSN:0009-4536    

DOI:10.1002/jccs.200500020

出版商:WILEY‐VCH Verlag    

年代:2005

数据来源: WILEY