Water Mobility and Crystallization Action of Lactose‐water Systems by Oxygen‐17 and Carbon‐13 NMR

HSI‐MEI ‐M LAI; SHELLY J. SCHMIDT

doi:10.1111/j.1365-2621.1990.tb03952.x

Water Mobility and Crystallization Action of Lactose‐water Systems by Oxygen‐17 and Carbon‐13 NMR

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Abstract

Systems ranging in concentration from 10‐60g lactose/100g water were investigated by fully proton decoupled ¹⁷O and fully proton decoupled ¹³C Nuclear Magnetic Resonance (NMR). The relation between ¹⁷O 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 13C 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.

Original language	English (US)
Pages (from-to)	1435-1440
Number of pages	6
Journal	Journal of food science
Volume	55
Issue number	5
DOIs	https://doi.org/10.1111/j.1365-2621.1990.tb03952.x
State	Published - Sep 1990

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Food Science

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abstract = "Systems ranging in concentration from 10‐60g lactose/100g water were investigated by fully proton decoupled 17O and fully proton decoupled 13C Nuclear Magnetic Resonance (NMR). The relation between 17O 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 13C 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.",

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year = "1990",

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doi = "10.1111/j.1365-2621.1990.tb03952.x",

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N2 - Systems ranging in concentration from 10‐60g lactose/100g water were investigated by fully proton decoupled 17O and fully proton decoupled 13C Nuclear Magnetic Resonance (NMR). The relation between 17O 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 13C 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.

AB - Systems ranging in concentration from 10‐60g lactose/100g water were investigated by fully proton decoupled 17O and fully proton decoupled 13C Nuclear Magnetic Resonance (NMR). The relation between 17O 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 13C 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.

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Water Mobility and Crystallization Action of Lactose‐water Systems by Oxygen‐17 and Carbon‐13 NMR

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