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Z Machoy

Publications and source records attributed to Z Machoy.

24 records · Page 2Linked to original sources
PubMedDate not supplied

Chemiluminescence in the coupled oxidation of lecithin and ascorbate.

Chemiluminescence (CL) that appears during oxidation of lecithin and ascorbate has been studied. A simple system consisting only of purified lecithin, which has one double bond, and ascorbate as a physiological reductant with a low redox potential, was used. The CL spectrum of lecithin contain a strong band lying in the near infrared, and three bands at 20 900 cm-1, 17 700 cm-1 and 15 800 cm-1, being characteristic of singlet molecular oxygen (1O2). The effect of 1O2 quenchers on both autooxidation processes has also been investigated. The obtained results indicate that the main emitter is the 1O2. An addition of ascorbate to the system lecithin plus buffer causes a decrease of CL intensity. That is a result of stronger quenching properties of ascorbate and not due to efficiency of the generation of 1O2.

Ascorbic Acid↗
PubMedDate not supplied

[Different mechanisms of fluoride binding by bones and teeth].

Dental and skeletal hydroxyapatite have a high affinity to fluorine. For demonstration of possible difference in fluorine binding by teeth and bones fluorides were determined in teeth buds, milk teeth and femur of human fetuses. A relatively stable content of fluorides was demonstrated in teeth buds and in milk teeth of children In the fetal bone the level of fluoride was lowest, but according to literature data, it rises with age. The observed differences in fluoride levels may be due to different physicochemical properties of dental hydroxyapatite and bone hydroxyapatite, or to different regulation of fluoride binding.

Bone and Bones↗