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Analysis of trihalomethanes by direct aqueous injection (THM-DAI)

✍ Scribed by Temmerman, Ingrid F. M. M. ;Quaghebeur, Dirk J. M.

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
251 KB
Volume
13
Category
Article
ISSN
0935-6304

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✦ Synopsis

peak represents either sinigrin itself or an other impurity from the sample overlapping with sinigrin. So it is evident, that glucotropaeolin is a better internal standard than sinigrin for the determination of glucosinolate content of oilseed rape by HPLC. HPLC methods will only detect intact glucosinolates. Glucosinolates degraded either enzymatically by myrosinase or thermally will not be determined by this method. In both cases the HPLC method detects a lower glucosinolate content. Figures 2 A and 2 B show the HPLC-chromatograms of a rapeseed sample untreated (A) and after heating to 110Β°C for 60 min (B). It is evident that the glucosinolate content in chromatogram B is lower. Especially the indolyl-glucosinolate 4-OH-glucobrassicin (peak 9) is very sensitive to heat and 50 % has already been destroyed. The alkenyl-glucosinolates are more stable and only 10 % of these have been lost.

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