Abstract
AbstractThe aim of this research was to study the effect of micro- and industrial scale malting on the folate content of barley. Two malting barley varieties (one spring and one winter) were studied, applying the same technology. Furthermore, a roasting experiment was carried out at given temperatures for different time periods. The total folate content was determined by microbiological method. The folate content of the barleys was between 10.1 and 23.4 µg/100 g dry matter. For micro- and industrial scale, malting folate content increased 6.5–8-fold and 4–7-fold, respectively, during the malting process. An unexpected result was observed during industrial malting: the folate content increased during kilning by 18–35%, unlike micro scale malting, where a 15–20% decrease was observed. Results obtained during roasting showed that folic acid content did not decrease when roasted for 20 min at 100 °C, but it decreased linearly with increasing temperature. Folate is completely degraded in 20 min at 200 °C. It can be stated that barley malt can serve as a relatively good source of folate, but barley variety and malting technology have significant impact on it.
Highlights
It is assumed that on a population level, nutritional requirements for folate cannot be completely covered by a varied diet, as recommended by national health authorities
The aim of this research was to study the effect of micro- and industrial scale malting on the folate content of barley
Differences of the folate content of the same barley cultivars cropped in successive years were observed by Edelmann et al (2013), who reported that environmental factors might cause variations in folate content even regarding samples of the same cultivars
Summary
It is assumed that on a population level, nutritional requirements for folate cannot be completely covered by a varied diet, as recommended by national health authorities. Several vitamer forms can occur, which are the reduced derivatives of folic acid (pteroyl-L-glutamic acid, PGA) It has an important role in prevention of neural tube defects in foetus. Elevated concentration of total homocysteine in blood (hyperhomocysteinaemia) is the risk factor for occlusive vascular disease (Mayer et al, 2001). Another aspect of the increasing interest in folate in terms of health promotion is the discovery that it may play an important role as an antioxidant, both by preventing the adverse effect of reactive oxygen species (ROS), as well as by inhibiting lipid peroxidation (Merola et al, 2013)
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