Another issue to be considered is storage. Antioxidants and vitamin
E, in particular, can be easily destroyed by light, water and
heat (Wang, Xue, Newman, & Newman, 1993). Newly harvested
barley will often be in storage for between 4 and 18 months before
processing (Idaho Barley Commission, 2011). Even though barley is
usually stored in silos with cooling aeration systems at less than
15 C and ideally to 10 C (Viljoen, 2001); storage may have an
effect on vitamin E content and antioxidant capacity. Indeed, storage
at 25, 27 or 35 C led to a significant loss of vitamin E content
(Liu & Moreau, 2008; Wang et al., 1993). However, research has not
been published on the influence of storage on both antioxidant
capacity and vitamin E content in barley at the usual temperatures
used by industry.
This study focused not only on the antioxidant capacity of barley
genotypes but also on the content of vitamin E, which is often
claimed to be an important antioxidant compound. The objectives
of this study were to evaluate these components in a range of barley
genotypes and the impact on them of storage under conditions
similar to those used in industry. Barley genotypes were chosen
based on their grain colour, whether hulless or not, and their use
in food, malt or animal feed.
Another issue to be considered is storage. Antioxidants and vitaminE, in particular, can be easily destroyed by light, water andheat (Wang, Xue, Newman, & Newman, 1993). Newly harvestedbarley will often be in storage for between 4 and 18 months beforeprocessing (Idaho Barley Commission, 2011). Even though barley isusually stored in silos with cooling aeration systems at less than15 C and ideally to 10 C (Viljoen, 2001); storage may have aneffect on vitamin E content and antioxidant capacity. Indeed, storageat 25, 27 or 35 C led to a significant loss of vitamin E content(Liu & Moreau, 2008; Wang et al., 1993). However, research has notbeen published on the influence of storage on both antioxidantcapacity and vitamin E content in barley at the usual temperaturesused by industry.This study focused not only on the antioxidant capacity of barleygenotypes but also on the content of vitamin E, which is oftenclaimed to be an important antioxidant compound. The objectivesof this study were to evaluate these components in a range of barleygenotypes and the impact on them of storage under conditionssimilar to those used in industry. Barley genotypes were chosenbased on their grain colour, whether hulless or not, and their usein food, malt or animal feed.
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