Impact of enrichment with egg constituents on water status in gluten-free rice pasta – nuclear magnetic resonance and thermogravimetric approach
Magdalena Witek , Ireneusz Maciejaszek , Krzysztof Surówka
AbstractEffects of freeze-dried egg white, yolk and whole egg enrichment on water behaviour in fresh pasta dough, dried and cooked rice pasta with respect to control samples were studied by 1H nuclear magnetic resonance (NMR) relaxometry and thermogravimetric analysis. Enrichments caused lower mobility of water (T2) localised within the starch-protein matrix in fresh dough as well as dried pasta. Water compartmentalization was also downgraded in cooked products. Water fractions with different T2 values were linked to temperature peaks at the first derivative of the thermogravimetric (DTG) curve. From the DTG curve strong interaction of water molecules with proteins of egg white was revealed. Egg proteins also influenced viscoelastic properties of dough, and enhanced the firmness and chewiness of cooked pasta. Structural changes induced by various types of enrichment were reflected in the different molecular mobility at the water-matrix interface (T1). The enrichments also altered the colour and cooking properties.
|Journal series||Food Chemistry, ISSN 0308-8146, e-ISSN 1873-7072, (N/A 200 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||NMR relaxation, TGA/DTG, Gluten-free rice pasta, Eggs|
|ASJC Classification||; ;|
|Publication indicators||: 2018 = 2.17; : 2018 = 5.399 (2) - 2018=5.488 (5)|
|Finansowanie||This Research was financed by the Ministry of Science and HigherEducation of the Republic of Poland.|
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