<title>Laser instrumentation for express diagnostics of impurities and toxins in liquid food</title>

Abstract

We present a new device called <<MIG>> for monitoring milk parameters and discuss some possibilities of its modification for express-diagnostics of man-caused contamination. At present, the developed laser device <<MTG>> is capable of precisely measuring the concentration of fats, proteins, and water in milk. The operation of the device is based on comparing the intensities of elastic scauering radiation from three semiconductor lasers with different wavelengths in the near-infrared range. It takes only about 30 seconds to complete a single measurement. Now we are developing a method for express-diagnostics of man-caused toxins (antibiotics, metal salts, etc.) in milk by studying non-elastic scattering and luminescence induced by visible-range laser radiation. The non-elastic scattering radiation in milk contaminated with a salt of lead is studied. It is observed that the radiation intensity decreases with an increase in the impurity concentration. We suppose that this is due to luminescence quenching caused by the impurity presence We have found out that the scattered light intensity exponentially changes with the concentration of the metal. The sensitivity in changing light intensity especially high at low concentrations of impurities.We suppose that these results can be used for express-diagnostics of toxins in milk by the proposed laser device <<MTG>>.Key words : diagnostic milk composition and salt of metal in milk, scattering light in milk, fat, albumin

Control of bulk products’ humidity and grinding size by the photoluminescent method photoluminescent quality control

“…For express diagnostics of toxins (such as antibiotics, salts, metals, etc.) contained in milk, a laser device was suggested, which operates through the comparison of the intensities of elastic scattering radiation of three semiconductor lasers with different wavelengths in the near-infrared range (Moguilnaia, Saguitova, Prokhorov, Grebenuk, & Grebenuk, 2001).…”

Control of powdery contents and mass rates of the extract in the dry substance of barley malt by photoluminescent method

“…For a rapid diagnosis of toxins in milk (antibiotics, salts, metals, etc. ), a laser device was suggested, based on comparing the intensities of elastic scattering radiation of three semiconductor lasers with different wavelengths in the NIR range (Moguilnaia et al ., 2001). A laser device was also developed in order to determine protein and fat content in milk (Saguitova et al ., 2004).…”