Water Mobility and Crystallization Action of Lactose?water Systems by Oxygen?17 and Carbon?13 NMR
Journal
Journal of Food Science
Journal Volume
55
Journal Issue
5
Pages
1435-1440
Date Issued
1990
Author(s)
SCHMIDT S.J.
Abstract
ABSTRACT Systems ranging in concentration from 10‐60g lactose/100g water were investigated by fully proton decoupled 17 O and fully proton decoupled 13 C Nuclear Magnetic Resonance (NMR). The relation between 17 O NMR transverse relaxation rate measurements and lactose concentration showed water mobility decreased linearly with increasing lactose concentration up to 25g lactose/100g water and decreased rapidly and nonlinearly above that level. Water mobility was used to monitor lactose crystallization in supersaturated solutions with time. The 13 C NMR showed no significant differences in chemical shifts of carbon atom peaks in lactose molecules during crystallization. However, depending on the method of sample preparation, mutarotation could be observed.
SDGs
Type
journal article