In the 1989 field samples, total QAC levels in the betaine fraction were initially determined on half the sample by a spectrophotometric periodide assay (Ladyman et al.
The majority of the samples taken during the 1990 growing season were analyzed for QAC by the periodide assay (Ladyman et al.
Total QAC levels of the betaine fractions of these greenhouse-grown plants were determined by the periodide assay.
Total QAC levels of the betaine fractions of these plants were determined by the periodide assay.
Six high-QAC and five low-QAC sorghum genotypes identified in the initial screen were further analyzed by performing a duplicate periodide assay and by using a more specific assay for GB on the same sample, employing stable isotope dilution DCI-MS with [sup.
The periodide assay was used to determine total QACs.