Authors:M. Dogaru, Mihaela Calin, and C. Stan-Sion
The Accelerator mass spectrometry (AMS) analysing method is described with applications for the detection of tritium leaks,
detection of pollution and for research in the fusion experiments. The special requirements for an experiment of AMS with
tritium are also presented. This paper concludes by showing the possibilities for each AMS facility to perform applications
for detecting and preventing the environment pollution with tritium.
Authors:M. Croitoru, I. Fülöp, M. Ajtay, C. Balogh, and M. Dogaru
Artificial sweeteners were introduced in therapy as sugar substitutes for diabetic patients. Nowadays these substances are widely used for sugar substitution in low calorie drinks and sweets. Most commonly used products to date are saccharine, cyclamate, aspartame, and acesulfam; maximum accepted daily intakes are stated for each one.A simple reverse phase (RP18) HPLC-UV method with direct detection (196 nm) was developed by us in order to measure the concentrations of the three sweeteners. No sample preparation is required, other than dilution. Limits of detection are 12 mg l−1, 0.5 mg l−1 and lower than 0.25 mg l−1 for cyclamate, aspartame and saccharine, respectively. Concentrations ranged between 113.14–280.07 mg l−1 in the case of cyclamate, 17.96–50.94 mg l-1 for saccharine, and 9.94–296.82 mg l−1 for aspartame.
Authors:M. Croitoru, I. Fülöp, M. Ajtay, G. Dudutz, O. Crăciun, and M. Dogaru
To date, monosodium glutamate is the most used flavour enhancing food additive. Because high levels of glutamate are toxic to brain concerns appeared regarding the safe use of glutamate and there is a 10 g kg
concentration limit in foodstuff. A simple HPLC-UV method, based on a derivatization procedure with
-phthaldialdehyde, was developed for determination of glutamate in meat products, soup bases and vegetable concentrates. Even if our method is less sensitive than the HPLC-fluorescence ones widely available, it is able to measure amounts at least 200 times smaller than the maximum allowed one, has good reproducibility (CV under 2% for intraday and under 3% for interday determinations), linearity and accuracy. Less expensive HPLC systems are required and the formed derivative is very stable (at least 1 week), good separation is obtained with the less expensive 5 μm particle C
columns and methanol as organic phase. Concentration of free glutamate ranged between 0.14 g kg
in sausage without added glutamate to as high as 2.16 g kg
in a pork sausage. Concentration in vegetable mixes and soup bases were between 80–120 g kg