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Gastric emptying rate and chyme characteristics for cooked brown and white rice meals in vivo
Author(s) -
Bornhorst Gail M,
Chang Lucy Q,
Rutherfurd Shane M,
Moughan Paul J,
Singh R Paul
Publication year - 2013
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.6160
Subject(s) - brown rice , gastric emptying , bran , white rice , digestion (alchemy) , stomach , starch , food science , meal , chemistry , zoology , biology , agronomy , biochemistry , chromatography , raw material , organic chemistry
BACKGROUND Rice structure is important to rice grain and starch breakdown during digestion. The objective of this study was to determine the gastric emptying and rice composition during gastric digestion of cooked brown and white medium‐grain (Calrose variety) rice using the growing pig as a model for the adult human.RESULTS Brown and white rice did not show significantly different gastric emptying rates of dry matter or starch, but brown rice had slower protein emptying ( P < 0.05). Moisture content was greater and pH was lower in the distal stomach compared to the proximal stomach ( P < 0.0001), and varied with time ( P < 0.0001). The mechanism of physical breakdown for brown and white rice varied. Brown rice exhibited an accumulation of bran layer fragments in the distal stomach, quantified by lower starch and higher protein content.CONCLUSION The quantity of gastric secretions observed after a brown or white rice meal may be related to the meal buffering capacity, and are accumulated in the distal stomach. The delayed rate of protein emptying in brown rice compared to white rice was most likely due to the accumulation of bran layers in the stomach. © 2013 Society of Chemical Industry