Effects of ultraviolet light on biogenic amines and other quality indicators of chicken meat during refrigerated storage.

Radiation from UV-C has been demonstrated as a potential surface decontamination method in addition to several advantages over regular sanitation methods. However, UV-C radiation possibly affects the physicochemical properties of meat products. To determine the optimum exposure time for bacterial reduction, 39 chicken breasts, inoculated with a pool of Salmonella spp., were submitted to 3 levels of UV-C intensities (0.62, 1.13, and 1.95 mW/cm²) for up to 120 s. After the optimum exposure time of 90 s was determined, changes in the biogenic amines, total aerobic mesophilic bacteria, Enterobacteriaceae, lipid oxidation, pH, and instrumental color were evaluated in 84 chicken breasts that were irradiated (0.62, 1.13, and 1.95 mW/cm²) and stored at 4°C for 9 d. The groups treated with UV-C radiation exhibited an increase in tyramine, cadaverine, and putrescine contents (P < 0.05). The highest UV-C intensity (1.95 mW/cm²) promoted a decrease in the initial bacterial load, and extended the lag phase and the shelf life. The groups irradiated with 1.13 and 1.95 mW/cm² exhibited a more stable b* value than the other groups; similar trends for L*, a*, pH, and TBA reactive substance values were observed among all groups. The UV-C light was demonstrated to be an efficient alternative technology to improve the bacteriological quality of chicken meat without negatively affecting the physical and chemical parameters of chicken breast meat. Nonetheless, the increases on the biogenic amines content should be considered as an effect of the UV processing and not as an indicator of bacterial growth.

Evaluation of the nocturnal levels of urinary biogenic amines in men exposed overnight to 50-Hz magnetic field.

The aim of this study was to determine whether exposure to magnetic fields might affect human health and to look for possible effects of acute exposure (9 hours) to 50-Hz magnetic fields (10 microT) on the urinary concentration of biogenic amines. Thirty-two young men (20-30 years old) were divided into two groups (sham-exposed and exposed group) of 12 to 16 subjects each. All subjects participated in two 24-hour experiments to evaluate the effects of both continuous and intermittent exposure to magnetic fields. The subjects were exposed to the magnetic field from 2300 to 0800, while lying down. Total urine (from 2300 to 0800) was collected at 0800. The results (expressed as a ratio of biogenic amine excretion to creatinine excretion (nmol/mmol)) did not differ significantly between sham-exposed and exposed men for any of the parameters measured: adrenaline, noradrenaline, dopamine, dihydroxyphenylalanine, 3,4-dihydroxyphenylacetic acid, homovanillic acid and 5-hydroxyindoleacetic acid. These results suggest that nocturnal exposure to either continuous or intermittent 50-Hz magnetic fields of 10 microT does not affect, at least under our experimental conditions, the nocturnal excretion of biogenic amines in healthy young men.

[The change of biogenic amine blood level under the influence of the low intensity laser infrared radiation]. / Izmeneniia soderzhaniia biogennykh aminov v krovi pri vozdeistvii nizkointensivnogo lazernogo izlucheniia infrakrasnogo diapazona.

The dynamics of the biogenic amines level in the blood of patients after performance of hemorrhoidectomy was dependent on severity of an organism stress-reaction predicting the wound healing outcome. When the wound irradiation using the low-energy laser of infrared diapason is performed in patients with the lowered reactivity of organism the histamine and serotonin contents dynamics is the same as in the patients with normal reactivity.

Influence of gestational age to low-level gamma irradiation on postnatal behavior in mice.

The present investigation was carried out to study the effects of in utero exposure to low-level gamma radiation (0.25, 0.35, or 0.50 Gy) on the postnatal neurophysiology and neurochemistry of the mouse. Pregnant Swiss albino mice were irradiated on days 11.5, 12.5, 14.5, or 17.5 post coitus (PC) and allowed to deliver. Locomotor and exploratory activities, learning and memory functions, and emotional activities were tested at 3 months of age using behavior tests. A representative group of animals was killed and hippocampal biogenic amines, noradrenaline, dopamine, serotonin (5-HT), and 5-HT's metabolite 5-hydroxy indoleactetic acid (5-HIAA), were measured. Exposure to 0.25 Gy at any of the gestation days did not produce any significant impairment in brain functions. However, an increase in gamma irradiation to 0.50 Gy on all the gestation days produced significant impairment in locomotor (open-field test) and anxiolytic (light and dark area test) activities, learning (hole board test), memory functions (active avoidance test), and emotional activity (rearings). The late fetal period is relatively resistant to radiation-induced impairment of brain functions. Both of the organogenesis gestation days showed a higher sensitivity than the fetal gestation days studied. Even a lower dose of 0.35 Gy when exposed on the late organogenesis days 11.5 and 12.5 PC, produced significant reduction in locomotor and exploratory activities. Day 11.5 PC showed a higher sensitivity than the other PC days studied. Biogenic amines did not show significant change after any of the exposures on any of the gestation days. The results suggest a threshold between 0.25 to 0.35 Gy for postnatal neurobehavior changes.

[The action of sublethal doses of ionizing radiation on the endogenous radioresistance background]. / Issledovanie deistviia subletal'nykh doz ioniziruiushchego izlucheniia na éndogennyi fon radiorezistentnosti.

Sublethal doses of X radiation (0.5 Gy and 1 Gy) caused the alterations in levels of main components of endogenous radioresistance background in rat tissues. There were demonstrated the decrease of serotonin content in stomach mucosa and spleen, adrenalin, noradrenalin and corticosteroid contents in adrenal glands, nonprotein thiols content in spleen, and the increase of lipid peroxide level in serum on the 3-14 days after irradiation. The recovery of the investigated parameters was occurred to the 21 day after exposure.

[The combined action of ionizing radiation and a heat load on the content of biogenic amines in the blood of guinea pigs with anaphylactic shock]. / Kombinirovannoe deistvie ioniziruiushchego izlucheniia i teplovoi nagruzki na soderzhanie biogennykh aminov v krovi morskikh svinok pri anafilaticheskom shoke.

The anaphylactic shock and alterations in the epinephrine and norepinephrine content of the blood were inhibited in guinea pigs which were repeatedly kept at high temperature (50 degrees C). Preirradiation with a dose of 1 Gy prevented this effect.

[Biogenic amines and cyclic nucleotides in the laser therapy of long-term nonhealing stomach ulcers]. / Biogennye aminy i tsiklicheskie nukleotidy pri lazeroterapii dlitel'no ne zazhivaiushchikh iazv zheludka.

A study is presented of the effect of copper vapors laser therapy on the content of biogenic amines--serotonin and histamine and the state of adenylcyclase (AC) system (content of cAMP, cGMP and AC activity) at the edge of the gastric ulcer. Direct effect of laser radiation (single dose 10--15 J.) produced a significant increase of serotonin, histamine, cAMP, AC activity and an insignificant increase of cGMP. Healing of the ulcerative defect after 5--6 laser therapy sessions was followed by a reduction of the content of serotonin, increase of histamine, cAMP and AC activity. The authors discuss the biostimulating effect of laser radiation by influencing the inflammatory-proliferative processes in the epitheliocytes in prolonged nonhealing gastric ulcers.

[The effect on an impulse electromagnetic field on the bioamine allowance of the spinal ganglion in rats under whole-body exposure]. / Vliianie impul'snogo élektromagnitnogo polia na sostoianie bioaminnoi obespechennosti spinnomozgovogo gangliia krys v usloviiakh total'nogo vozdeistviia.

In experiments with albino male rats subjected to whole-body pulse electromagnetic irradiation of 100 mTl magnetic induction, the luminescent histochemical methods and the subsequent microspectrofluorometry were used to determine the content of biogenic amines (catecholamines, serotonin, and histamine) in spinal ganglia neurons. Significant changes were revealed not only in the content of all studied bioamines but in the histamine/serotonin ratio as well.

Factors affecting the stability and separation of biogenic amines and their metabolites. Simultaneous measurement by HPLC with electrochemical detection.

We describe a simple and sensitive method for the rapid and simultaneous quantification of dopamine, 3-methoxytyramine, 3,4-dihydroxyphenylacetic acid, homovanillic acid, serotonin, 5-hydroxyindoleacetic acid, and 5-hydroxytryptophan in the picogram range in small samples of brain tissue. After minimal sample preparation the amines were analyzed utilizing isocratic separation and reversed-phase high-performance liquid chromatography with amperometric detection. The effects of pH and methanol concentration in the solvent on the retention times of the amines on two different C-18 columns were investigated. Stabilities of the amines in solution were determined under various conditions. Light and air were found to be detrimental to the stability of indoles. In the absence of light, their stability was dependent on temperature and the presence of air; however, in the absence of air, light and/or temperature had little effect. The catechols were stable under most of these conditions. The assay has been applied to study the postmortem stability of dopamine, serotonin, and their metabolites in the striatum of rat brain. In the striatum 4 hr after death, the content of dopamine and 3,4-dihydroxyphenylacetic acid decreased by less than 20%, and 3-methoxytyramine increased by 158%, with no changes in serotonin, 5-hydroxyindoleacetic acid, and homovanillic acid.