whereas FaDOAc increased by 27.9% compared to fresh control
(unblanched blast frozen carrot) (Table 1). In case of blanched slow
frozen carrot disks the levels of FaOH and FaDOH decreased by
9.58% and 15.74% respectively this corroborates with previously
reported study where it was observed that the higher temperature
blanching treatments lead to higher losses (20–25%) on the levels
of polyacetylenes in parsnips (Rawson et al., 2010b). However FaDOAc
was found to increase by 36.3%, indicating that the inclusion of
a blanching step affected the final content of polyacetylenes significantly
(p < 0.05). This is despite the fact that in the present study
lower temperature for blanching, as described by Hansen et al.
(2003) was chosen. Similar results were reported by Hansen
et al. (2003), however Kidmose et al. (2004) reported that blanching
followed by freezing of the shredded carrots increased the levels
of FaOH and decreased the levels of FaDOH and FaDOAc.
Moreover thermal processing such as blanching can induce partial
oxidation of FaDOH which may lead to production of FaDOAc as
synthesised by Lund (1992), which may explain the increase in level
of FaDOAc after blanching in addition the higher content of
FaDOAc in the blanched samples might also be due to an enhanced
extractability during analysis. During blanching the cells will be
soften and compounds are easily extracted compared to raw material.
Hence if the degradation of FaDOAc is smaller than the increased
extractability the content of FaDOAc will be higher after
blanching.