Three simple, accurate and economical spectrophotometric methods in ultraviolet and visible region were developed for the determination of cefprozil in bulk and dosage forms have been described. The method A is based on the reduction of ferric ion into ferrous ion by the mentioned drug in the presence of 1,10-phenanthroline to form a highly stable orange red colored ferrion complex measured at ...

While attempting to determine the presence of lactase in mammary tissue, it became evident that no satisfactory method for the determination of the hydrolytic products of lactose in the presence of the substrate was available. We, therefore, sought to modify the Barfoed test in order to make it practical for quantitative, as well as qualitative, procedures. Since the publication of Barfoed’s te...

Uric acid has long been considered to be a metabolically inert endproduct of purine metabolism in the human (1, 2). This view has been challenged by Folin, Berglund, and Derick (3), who, in an extensive review of the subject, reported that only about 50 per cent of intravenously administered uric acid in man could be recovered. More recently, with the use of Nls-labeled uric acid, Benedict, For...

Bueding, E. & Goldfarb, W. (1941). J. biol. Chem. 141, 539. Folin, 0. & Wu, H. (1920). J. biol. Chem. 41, 367. Friedemann, T. E., Cotonio, M. & Shaffer, P. A. (1927). J. biol. Chem. 73, 335. Friedemann, T. E., Haugen, G. E. & Kmieciak, T. C. (1945). J. biol. Chem. 157, 673. Gordon, J. J. & Quastel, J. H. (1939). Biochem. J. 33, 1332. Lehnartz, E. (1928). Hoppe-Seyl. Z. 179, 1. Long, C. (1944). ...

Methanolic extracts of 13 commercially available citrus spp., peels and tissues growing in Iran were investigated for their antioxidant activity by DPPH method. IC50 for antioxidant activity ranged from 0.6-3.8 mg ml(-1). Total phenolic content of the citrus spp. samples (based on folin Ciocalteu method) varied from 66.5 to 396.8 mg gallic acid equivalent/g of extract and flavonoids content (ba...

Antibacterial activity, total phenolic content and flavonoid concentrations of extracts from the leaves of Arctostaphylos uva-ursi L. were performed. Tested bacterial strains are 20 clinical isolates, including different strains of Escherichia coli and Enterococcus faecalis. The total phenolic content was determined using Folin-Ciocalteu reagent. The concentration of flavonoids in extracts were...

In the rubber extraction process, guayule leaves represent an important biomass waste by-product, up to 32%, whose exploitation might contribute valorization of whole plant. The any its bioactive compounds or use as antioxidant seems be most feasible alternative. This study relates morphology individual content 35 (of 50 tentatively identified), determination overall phenolic and activity. morp...

Antioxidant capacities of 56 selected Chinese medicinal plants were evaluated using the Trolox equivalent antioxidant capacity (TEAC) and ferric reducing antioxidant power (FRAP) assays, and their total phenolic content was measured by the Folin-Ciocalteu method. The strong correlation between TEAC value and FRAP value suggested that the antioxidants in these plants possess free radical scaveng...

The antioxidant capacities and the total phenolic content in cocoa liquor directly manufactured chocolate from an artisan manufacturer were measured using different in vitro methods (BR, TEAC, and Folin– Ciocalteu Reagent). These parameters were then compared with those of a chocolate made by a leading manufacturing company producing chocolate and cocoa-containing products. A statistical analys...