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The effects of 1-methylnaphthalene after inhalation exposure on the serum corticosterone levels in rats

100%

Świercz R. , Stępnik M.

International Journal of Occupational Medicine and Environmental Health

2020

tom 33

nr 5

691-699

ObjectivesThis paper reports on the trend of the stressogenic stimulus caused by a repeated exposure to 1-methylnaphthalene (1-MN) vapors at the nominal concentrations of 0 mg/m3 (the control restrainer), 50 mg/m3 or 200 mg/m3 in the nose-only inhalation system, by analyzing the serum corticosterone (CORT) levels in rats.Material and MethodsThree groups of rats were exposed in restrainers to 1-MN vapors at the nominal concentrations of 0 mg/m3, 50 mg/m3 or 200 mg/m3 for 5 days. One control group of animals spent all the time during the experiment in an individually ventilated plastic cage. The serum CORT concentrations were determined in all 4 groups of the rats. The blood samples drawn from the tail vein were collected every day after termination of the 6-h exposure. On the fifth day, blood samples were collected 15 min, 30 min, 45 min, 1 h, and 3 h after termination of the 6-h exposure.ResultsOn the fifth day of the study, no statistically significant changes in body weights between all groups of animals were found. After 5 days of the observation, increased food intake in the control groups was noted. Significantly higher CORT concentrations in the rats exposed to 1-MN at 200 mg/m3 and in the animals from the control restrainer were found, comparing to the animals exposed to 1-MN at 50 mg/m3 and the animals from the control cage.ConclusionsThe application of 6-h restraining induced high concentrations of the stress hormone, CORT, in the blood of rats. The short-term exposure of rats to 1-MN non-linearly reduced the restraint stress measured with CORT concentration.

1-Metylonaftalen : metoda oznaczania

100%

Wesołowski W.

Podstawy i Metody Oceny Środowiska Pracy

1999

tom Nr 22

127--131

The method is based on the adsorption of vapours of 1-methylnaphthalene on resine XAD-2, desorption with carbon disulfide and determination in the obtained solution by gas chromatography (GC-FID). The detremination limit of the method is - 2 mg/m3. The determination limit of the method is - 60 mg/m3.