Changes in the physicochemical properties of barley and oat starches upon the use of environmentally friendly oxidation methods
Magdalena Kurdziel , Maria Łabanowska , Sławomir Pietrzyk , Joanna Sobolewska-Zielińska , Marek Michalec
AbstractIn this work, two environmentally friendly modification methods, UV irradiation and thermal treatment, were applied for the first time for modifications of oat and barley starches. Their impacts on starch properties were compared with those observed for starch oxidation with NaClO. XRD, EPR, FTIR, SEM and SEC methods were used to characterize the effects of modifications on starch structures. The decreases in molecular weight and crystallinity degree showed the destruction of starch structures upon prolonged UV irradiation and thermal treatment, more advanced in barley starch. The process of radical formation, studied by EPR, occurring to a larger extent in this starch, confirmed lower stability of barley starch structure. The alterations of starch structures correlated well with changes in its functional properties. It was found that UV irradiation was an effective oxidizing agent, whereas heating led mainly to the depolymerization of starch chains.
|Journal series||Carbohydrate Polymers, ISSN 0144-8617, e-ISSN 1879-1344, (N/A 140 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Barley starch, Oat starch, EPR signals of starch, Characteristics of starch structure, Thermal treatment, UV irradiation|
|ASJC Classification||; ;|
|Publication indicators||= 0; : 2018 = 1.72; : 2018 = 6.044 (2) - 2018=5.975 (5)|
|Finansowanie||This work was supported by National Science Centre, Poland (grant number: 2016/23/B/NZ9/01065)|
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