The sorption of 16 ionizable organic compounds (IOCs) to an estuarine sediment was measured in synthetic estuarine water as a function of IOC concentration (1–100 μM) at fixed ionic strength (0.4 M), pH (7.6), and sediment concentration (0.018 g sediment kg− 1 suspension). Of the 16 IOCs, 11 w...
A simple, rapid and sensitive spectrophotometric method is described for determining carbaryl, propoxur, fenitrothion and methyl parathion, based on reaction of their hydrolysis or reduction products (as appropriate) with 3-methyl-2-benzothiazolinone hydrazone hydrochloride in the presence of an...
The iron catalyzed oxidation reaction of 3-methyl-2-benzothiazolinone hydrazone (MBTH) with hydrogen peroxide was studied kinetically by an initial-rate method. The reaction was followed by measuring the absorbance at 345 nm of the product. According to the kinetic study, a mechanism is proposed...
The reaction between o-, m-, and p-methoxyphenols and 3-methyl-2-benzothiazolinone hydrazone (MBTH) is studied in the presence of horseradish peroxidase (HRP) and H2O2 as oxidative agent. The findings indicate that enzyme (H2O2 oxidoreductase; EC 1.11.1.7) catalyzes an oxidative coupling reactio...
We here describe a new spectrophotometric method for measuring total bilirubin in serum. The method is based on the cleavage of bilirubin giving formaldehyde which further reacts with diazotized 3-methyl-2-benzothiazolinone hydrazone hydrochloride giving blue colored solution with maximum absorb...
A new kinetic-catalytic method by the initial rate procedure for the determination of nanogram level of iron(III) is developed, which is based on its catalytic effect on the oxidative coupling of 3-methyl-2-benzothiazolinone hydrazone (MBTH) with N,N-dimethylaniline (DMA) to form an indamine dye...
A spectrophotometric procedure is described for determination of nortriptyline hydrochloride in pure and dosage form as well as in the presence of its degradate. 3-Methyl-2-benzothiazolinone hydrazone (MBTH) has been used as the chromogenic reagent, where aqueous solutions of the drug and reagen...
Laccase from Coriolus hirsutus catalyzes the oxidative condensation reaction between 3-methyl-2-benzothiazolinone hydrazone and 3-dimethylaminobenzoic acid to form a blue indamine dye. Optimum enzyme activity in this reaction occurs at pH 5. The rate of formation of the dye is linear with time u...
Two selective and sensitive spectrophotometric methods are proposed for the determination of isoxsuprine hydrochloride (ISX) in spiked human urine and in pharmaceuticals. The methods are based on the oxidative-coupling reaction between 3-methyl-2-benzothiazolinone hydrazone hydrochloride (MBTH) ...
The reaction between o-, m-, and p-methoxyphenols and 3-methyl-2-benzothiazolinone hydrazone was studied in the presence of laccase from Pyricularia oryzae. The findings show that laccase (benzenediol:oxygen oxidoreductase, EC 1.10.3.2) catalyzes the oxidative coupling reaction between MBTH and ...
2-Aminophenazine-1-carboxylic acid has been obtained from the ester which resulted from the oxidative cyclization in boiling nitrobenzene of the methyl esters of both 2,4-diaminodiphenylamine-3- and 2′,3-diaminodiphenylamine-2-carboxylic acids. The acid was also prepared via the very unreactive...
In acidic aqueous solutions, a glassy carbon electrode coated with an anodically-formed polymer of 1-aminophenazine (1-AP) mediates the reduction of dissolved 1-AP, Ce(IV), Fe(III) and O2. The effective surface area of the electrode appears to be reduced by several percent by the coating. Oxidat...
The oxidative cyclization in boiling nitrobenzene of 4,6-diaminodiphenylamine-2-carboxylic acid gave 3-aminophenazine-1-carboxylic acid. 4,6-Diaminodiphenylamine-3-carboxylic acid underwent decarboxylation, but the methyl ester gave methyl 3-aminophenazine-2-carboxylate from which the acid was o...
Ferric chloride oxidation of 2,4′-diamino-4- and -5-cyanodiphenylamines led to 2-amino-8- and -7-cyanophenazines respectively which could be hydrolysed to the corresponding 7- and 8-aminophenazine-2-carboxylic acids. 8-Aminophenazine-2-carboxylic acid was also made by the oxidative cyclization ...
We found a brand-new method for the generation of aryne from methyl 2-bromobenzoates via the Pd-mediated concomitant δ-carbon elimination and decarboxylation. The generated arynes underwent Pd-mediated [2+2+2] cycloaddition to give triphenylenes.
This paper reported the synthesis of a novel type of octyltetramethyldisiloxane-containing olefinic macromonomer (1-oct(7-en)yl-3-octyl-1,1,3,3-tetramethyldisiloxane or OO7), the copolymerization of OO7 with ethylene by vanadium catalyst, the evaluation of poly(ethylene-co-OO7) as additive on th...
Actein (1), a tetracyclic triterpenoid from the rhizome of Cimicifuga racemosa (black cohosh), and 82 related triterpenoid and steroidal saponins isolated from higher plants were evaluated for anti-HIV activity as a continuing study to discover potential anti-AIDS agents from natural products. A...
The Na+-K+-ATPase is a known target of cardiac glycosides such as digitoxin and ouabain. We determined that the enzyme also is a target of the structurally-related triterpene glycoside actein, present in the herb black cohosh. Actein’s inhibition of Na+-K+-ATPase activity was less potent than t...
Actein is a prominent triterpene glycoside occurring in Actaea racemosa. The triterpene glycosides are believed to be responsible for the estrogenic activity of an extract prepared from this herb. We determined in the crystal structure of actein by X-ray crystallography to be monoclinic P2(1) ch...
BackgroundThe triterpene glycoside actein from the herb black cohosh preferentially inhibits the growth of breast cancer cells and activates the ER stress response. The ER IP3 receptor and Na,K-ATPase form a signaling microdomain. Since actein is lipophilic, its action may be limited by bioavail...
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