During the past several years, remarkable progress has been made in elucidating biological fatty acid oxidation, and it is now clearly established that the oxidation of acyl CoA’ derivatives proceeds in the mitochondria (1) in a stepwise manner (2, 3) by a series of reactions closely resembling the hypothetical route proposed by Knoop. However, the biosynthesis of fatty acids has been less well...

Several investigators have shown that certain carcinogenic chemicals and polycydic hydrocar bons inhibit the autoxidation of benzaldehyde and lipoidal materials (5—7).This effect on benzalde hyde was confirmed. Further experiments carried out with carotene in solvents containing carbon tetrachioride or benzoyl peroxide showed that, un der the influence of light, many carcinogens and some othe...

The title compound, C(12)H(10)O(4)S, is a phenolic color developer used for leuco colorants. The two benzene rings with substituent hydr-oxy groups are nearly perpendicular to each other [dihedral angle = 91.5 (1)°]. There are inter-molecular O-H⋯O hydrogen bonds between an OH group of one mol-ecule and a sulfonyl O atom of a neighboring mol-ecule. One mol-ecule is hydrogen bonded to four symme...

The photoelectrochemical determination of ascorbic acid (AA) was studied based on the photochemical reduction of methylene blue (MB) in 0.1 M phosphate buffer (pH 7.0). MB was used as a redox mediator for the modification of a carbon paste electrode (CPE) due to its facile reducible-oxidizible behaviour. Muscovite, which has a layered structure, was found to be a good and stable supporting mate...

UNLABELLED BACKGROUND Previously described methods to separate dissolved U(IV) from dissolved U(VI) under acidic anoxic conditions prior to laboratory analysis were ineffective with materials currently available commercially. Three strong anion exchange resins were examined for their efficiency in separating, recovering, and preserving both redox states during separation. RESULTS Under oxi...

This paper describes a reserved-phase high-performance liquid chromatographic (HPLC) method for detecting malachite green (MG) and leuco-malachite green (LMG) using an isocratic toxic organic solvent/reagent-free mobile phase. Chromatographic separations were performed an Inertsil WP300 C4 with 0.02 mol/L octane sulfonic acid–ethanol mobile phase and a photodiode-array detector. The total run t...

The fine structure of plastids and carotenoid content of the pepper fruit (Capsicum annuum) were studied during the various stages of ripening. Red ripe fruits contained spindle-shaped chromoplasts which originated from leuco-chloroplasts. The bleaching herbicides amitrole and SAN 9789 inhibited the biosynthesis of total carotenoids and the development of typical spindle-shaped chromoplasts. Bo...

Polarization modulation-Fourier transform infrared (PM-FTir) spectra were. obtained in situ for polymer films of neutral red and thionine, and for a lilm of leucomethylene blue generated on a gold electrode as a function of potential. The spectra of the polymer films revealed that the aromatic rings lie mostly parallel to the electrode surface in both the reduced and oxidized forms. In contrast...