Since a satisfactory procedure of preparing pure protoporphyrin IX dimethyl ester from hemoglobin (1) has been worked out, it is interesting to investigate direct reduction of protoporphyrin IX dimethyl ester into mesoporphyrin IX dimethyl ester. Although these compounds, the melting points of which are too close to be of use for their differentiation, can be distinguished by HCl number (2) or ...

UNLABELLED Strawberry samples with enzyme activity and without enzyme activity (stannous chloride added) were measured for real-time formation of lipoxygenase (LOX) derived aroma compounds after 5 min pureeing using selected ion flow tube-mass spectrometry (SIFT-MS). The concentration of (Z)-3-hexenal and (E)-2-hexenal increased immediately after blending and gradually decreased over time, whil...

An on-line flow injection mercury analyser (FIMA) for inorganic (Hg) analysis in environmental waters is presented. The FIMA a portable dual-channel and purge-and-trap system combining aqueous reduction with stannous chloride (SnCl2), two-stage gold (Au) amalgamation, thermal desorption of Hg0 final detection cold vapour atomic fluorescence spectrometry (CVAFS). Simultaneous operations sample l...

This investigation compared the effects of a fluoride dentifrice and toothpastes formulated with antimicrobial ingredients (stannous fluoride and triclosan/copolymer) on oral micro-organisms, including those found in samples taken from the human oral cavity. Microbiological techniques determined the minimum inhibitory concentrations (MICs) of each dentifrice necessary to inhibit the growth of b...