A combined sampling and delay unit for flow injection analysis. The automated determination of 2-thiobarbituric acid reactive substances in foods
✍ Scribed by Søren Storgaard Jørgensen; Gitte Sørensen
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 725 KB
- Volume
- 322
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A new combined sampling and delay unit is described which makes it feasible to utilize slow chemical reactions in flow injection analysis. The unit allows a number of individual samples to "queue up" for a specified time before being transported to the detector. The applicability has been demonstrated in an automated procedure for the determination of 2-thiobarbituric acid (TBA) reactive substances in foods. The procedure has been optimized on l-10 PM standards of 1,1,3,3-tetraethoxypropane with regard to the concentration of TBA and reaction time. It was found that analytical conditions of 40 n&I TBA, 20 rnin and 60°C in the automated procedure as compared to 20 tnM, 40 min and 100°C in the manual TBA procedure yielded lower absorbance and a comparable reproducibility. The use of the sampling/delay unit for other slow reactions is indicated.