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Biomedical subjects

H Pyysalo

Publications and source records attributed to H Pyysalo.

28 records · Page 2Linked to original sources
PubMed1977

The effect of iron, tin, aluminium, and chromium on fading, discoloration, and precipitation in berry and red beet juices.

The effect of iron(II), tin(II), aluminium(III), and chromium(III) on the properties of red whortleberry, blackcurrant, and red beet juices was followed during storage for 10 months at 5 degrees C. The colour and pH changes were studied, and the precipitates formed were weighed and their metal contents assayed. Of the metals tested, only tin caused bluish discoloration in the berry juices. In the case of iron, aluminium, and chromium the low pH prevented this type of discoloration. In berry juices, some increases in colour intensity took place with the lowering of pH value, whereas in red beet juice the opposite change occurred. The colour changes due to storage appear to take place irrespective of the metals. Precipitation is enhanced in red whortleberry juice only by tin, and in blackcurrant juice by tin and iron. In red beet juice, precipitation is increased by the lowering of pH resulting from metal salt addition. In general, increase in the amount of metal added increased the metal content of the precipitate. Iron showed the greatest tendency to become bound in the precipitate, particularly in blackcurrant and red beet juice. The suitabilities of the metals for canning purposes are considered. Chromium, in particular, has interesting possibilities in view of the low degree of colour change associated with it.

Aluminum↗
PubMed1976

Tests for gyromitrin, a poisonous compound in false morel gyromitra esculenta.

The amount of hydrazine compounds, calculated as gyromitrin (N-methyl-N-formyl hydrazone of acetaldehyde) remaining in false morels during drying and cooking processes was followed. Boiling of false morels in a large amount of water for 10 minutes, the usual household procedure, destroys an average of 99.5% of the hydrazines. The amount of hydrazines in dried false samples was not constant: the 99-100% of the original amount was lost during the drying process. The mass, infra-red, 1H NMR and 13C NMR spectra of synthetic gyromitrin were recorded. The NMR spectra were analyzed with double resonance methods.

Ascomycota↗
PubMedDate not supplied

Cigarettes as a source of some trace and heavy metals and pesticides in man.

Trace and heavy metal and pesticide contents of different tobacco brands sold in Finland during 1920 to 1984 were determined by atomic absorption spectroscopy and gas chromatography-mass spectrometry with the purpose of investigating the variation in contents over time. In addition, the following were studied: the effect of commercial filters in cigarettes in preventing the inhalation of metals, the transfer of metals and pesticides to the mainstream smoke; and the correlation between the cadmium content of adipose tissue of smokers and their smoking habits. No differences were found in trace and heavy metal contents of different brands and packs from different decades. The pesticide residues in tobacco have followed the pattern of their use in the tobacco plantation. The dichlorodiphenyltrichloroethane (DDT) content of tobacco has decreased during the past 20 yr to about 1/200 of the peak value, i.e., from 34.5 to 0.17 micrograms/g. Cigarette filters significantly prevent the inhalation of cadmium, lead, magnesium, and iron. The mean content of cadmium in fat tissue of male smokers was four times that of non-smokers. The difference was statistically significant.

Adipose Tissue↗
PubMedDate not supplied

Heptachlor, heptachlor epoxide, and other chlordane compounds in Finnish plywood workers.

Residue levels of heptachlor, heptachlor epoxide, and other chlordane compounds were determined in sera from 74 Finnish plywood workers and 52 controls. Concentrations of heptachlor epoxide in plywood workers varied from below the detection limit of 0.1 ng/g to 19.2 ng/g serum (conversion factor for SI units = 975 [1 ng/g = 0.98 microgram/l]); the mean and standard deviation were 3.2 and 3.9 ng/g, respectively. Heptachlor expoxide values in controls varied from below the detection limit to 1.2 ng/g serum. The exposure time, i.e., number of years spent working with sizings that contained heptachlor, correlated with the residue levels of heptachlor epoxide that were measured in serum samples taken from employees at two companies (p = .03). The most common chlordane compound (contaminant of heptachlor) found in the sera of plywood workers was trans-nonachlor; also found were high concentrations of heptachlor epoxide. Headache, dizziness, and eye irritation were not related to serum levels of heptachlor or chlordane compounds.

Adolescent↗