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Biomedical subjects

J Rotgans

Publications and source records attributed to J Rotgans.

At least 19 recordsLinked to original sources
PubMed1991

[The effect of a chemotherapeutical amine containing toothpaste on plaque formation, gingivitis and caries in clinical and animal experiment].

"C31G" means and amine mixture, which shall be, a new "sure" substance of small toxicity and is used as an effective plaque and caries reducing chemotherapeutical substance in a tooth paste. In this study we report on: the caries reducing effect in the teeth cleaning experiment in Osborn-Mendel-rats (96 animals, 6 Groups) with C-31G-containing tooth pastes in different concentrations and also in combinations with and without fluoride. the effect of an 1% C31G-containing tooth paste on plaque formation (SLI + QHI) and gingivitis (SBI) in a clinical double blind cross over-study (section % patients, 2 groups, 2 pre-experimental OH-Plases, teeth cleaning once per day). The study results don't show the expected plaque and caries reducind effect. The results of the in vivo and in vitro experiments call for a critical examination of the substances with attention of further parameters.

Analysis of Variance↗
PubMed1990

Aluminium in tooth pastes and Alzheimer's disease.

Epidemiological studies from Norway and England suggest a relation between the frequency of Alzheimer's disease and the concentration of aluminium in the drinking water. Estimates, made in this study, show that the role of aluminium from tooth pastes may be even more important than that from the drinking water. For that reason we determined in samples of tooth pastes taken from the BENELUX market which brands contained aluminium. This appeared to be the case for about 22% of the brands which according to the manufacturers cover about 60% of the market.

Aluminum↗
PubMed1990

[The use of aluminum-containing toothpaste and its potential risk].

Epidemiological studies from Norway and England suggest that there is a relation between the frequency of Alzheimer's disease and the concentration of aluminum in the drinking water. A recent Dutch study suggests further that the role of aluminum from tooth pastes may be even more important than that from drinking water. For this reason we determined in samples from the Belgian market which tooth pastes contained aluminium oxyhydroxide as abrasive. This happened to be the case in 5 out of 27 brands. It is not know to us which part of the market these tooth pastes represent.

Aluminum Hydroxide↗
PubMed1983

The determination of amino-acid enantiomers in human saliva with Chirasil-Val.

The use of polysiloxanes as stationary phase in glass-capillary gas-chromatography carrying chiral groups enables the separation and quantitation of most amino-acid enantiomers and a variety of other compounds in a much shorter time than previously. This phase exhibits low volatility and high thermal stability and may be used in routine analysis with open tubular columns at temperatures of at least 175 degrees C. Most protein amino acids are separated in a temperature programme between 90 and 175 degrees C, thus obviating the need for multiple injections. Resolution factors are lower than those of other diamide phases containing the L-valine-t. butyl-amide group, but are sufficient for resolution of almost all protein amino-acid enantiomers. Incomplete recovery from the sample, incomplete derivatization, hydrolysis and thermal decomposition of the derivative and shifting response factors can be compensated for by adding the unnatural enantiomer. The accuracy of amino-acid analysis by enantiomer labelling is equal or superior to that of known methods and permits complete analysis of peptides with respect to both amino-acid composition and the optical purity of each amino acid. The application of this method to human saliva provided information concerning enzymic and bacterial process in the mouth.

Adult↗