Mobility of Water in Starch Powders Determined by Nuclear Magnetic Resonance

S. J. Richardson; I. C. Baianu; M. P. Steinberg

doi:10.1002/star.19870390605

Mobility of Water in Starch Powders Determined by Nuclear Magnetic Resonance

S. J. Richardson, I. C. Baianu, M. P. Steinberg

Research output: Contribution to journal › Article › peer-review

Abstract

The molecular mobility of water in corn starch powders (71 to 96% solids) was determined by deuterium (²H) and oxygen‐17 (¹⁷O) high‐field Nuclear Magnetic Resonance (NMR) spectroscopy, in deuterium (D₂O) and oxygen‐17 enriched water (H₂¹⁷O), respectively. The NMR transverse relaxation rate (R₂) was related to both the concentration and activity of water (a_w). The concentration plot showed two regions of water mobility; trapped and monolayer water. The water activity plot showed two linear regions of water mobility; Region A, from 0.99 to 0.23 a_w, and Region B, from 0.23 to 0.11 a_w. The linear relationship in Region A between water mobility, as measured by R₂ and water activity is hypothesized to be due to the hydrophobic nature of the starch granules which results in diffusion limited water motion. Relaxation rates for ²H and ¹⁷O at high a_w were compared with one another and literature data.

Original language	English (US)
Pages (from-to)	198-203
Number of pages	6
Journal	Starch ‐ Stärke
Volume	39
Issue number	6
DOIs	https://doi.org/10.1002/star.19870390605
State	Published - 1987

ASJC Scopus subject areas

Food Science
Organic Chemistry

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10.1002/star.19870390605

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abstract = "The molecular mobility of water in corn starch powders (71 to 96% solids) was determined by deuterium (2H) and oxygen‐17 (17O) high‐field Nuclear Magnetic Resonance (NMR) spectroscopy, in deuterium (D2O) and oxygen‐17 enriched water (H217O), respectively. The NMR transverse relaxation rate (R2) was related to both the concentration and activity of water (aw). The concentration plot showed two regions of water mobility; trapped and monolayer water. The water activity plot showed two linear regions of water mobility; Region A, from 0.99 to 0.23 aw, and Region B, from 0.23 to 0.11 aw. The linear relationship in Region A between water mobility, as measured by R2 and water activity is hypothesized to be due to the hydrophobic nature of the starch granules which results in diffusion limited water motion. Relaxation rates for 2H and 17O at high aw were compared with one another and literature data.",

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AU - Richardson, S. J.

AU - Baianu, I. C.

AU - Steinberg, M. P.

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Y1 - 1987

N2 - The molecular mobility of water in corn starch powders (71 to 96% solids) was determined by deuterium (2H) and oxygen‐17 (17O) high‐field Nuclear Magnetic Resonance (NMR) spectroscopy, in deuterium (D2O) and oxygen‐17 enriched water (H217O), respectively. The NMR transverse relaxation rate (R2) was related to both the concentration and activity of water (aw). The concentration plot showed two regions of water mobility; trapped and monolayer water. The water activity plot showed two linear regions of water mobility; Region A, from 0.99 to 0.23 aw, and Region B, from 0.23 to 0.11 aw. The linear relationship in Region A between water mobility, as measured by R2 and water activity is hypothesized to be due to the hydrophobic nature of the starch granules which results in diffusion limited water motion. Relaxation rates for 2H and 17O at high aw were compared with one another and literature data.

AB - The molecular mobility of water in corn starch powders (71 to 96% solids) was determined by deuterium (2H) and oxygen‐17 (17O) high‐field Nuclear Magnetic Resonance (NMR) spectroscopy, in deuterium (D2O) and oxygen‐17 enriched water (H217O), respectively. The NMR transverse relaxation rate (R2) was related to both the concentration and activity of water (aw). The concentration plot showed two regions of water mobility; trapped and monolayer water. The water activity plot showed two linear regions of water mobility; Region A, from 0.99 to 0.23 aw, and Region B, from 0.23 to 0.11 aw. The linear relationship in Region A between water mobility, as measured by R2 and water activity is hypothesized to be due to the hydrophobic nature of the starch granules which results in diffusion limited water motion. Relaxation rates for 2H and 17O at high aw were compared with one another and literature data.

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Mobility of Water in Starch Powders Determined by Nuclear Magnetic Resonance

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