TY - JOUR
T1 - Extracted oat and barley β-glucans do not affect cholesterol metabolism in young healthy adults
AU - Ibrügger, Sabine
AU - Kristensen, Mette Bredal
AU - Poulsen, Malene Wibe
AU - Mikkelsen, Mette Skau
AU - Ejsing, Johnny
AU - Jespersen, Birthe P Møller
AU - Dragsted, Lars Ove
AU - Engelsen, Søren Balling
AU - Bügel, Susanne Gjedsted
N1 - CURIS 2013 NEXS 220
PY - 2013
Y1 - 2013
N2 - β-Glucans are known to exhibit hypocholesterolemic effects. Increased intestinal viscosity is thought to be crucial for cholesterol lowering. It is suggested that concentration, molecular mass, and structure, including the ratio of (1→3) to (1→4) glucan bonds in the molecule, are of importance for β-glucan functionality. This study investigates the effects of 3 different β-glucan sources, incorporated into a beverage and yogurt, on blood lipids and fecal endpoints. Fourteen participants completed this randomized, crossover, single-blinded study with four 3-wk periods: control and 3.3 g/d oat, barley, and barley mutant β-glucans of similar molecular mass. Before and after each period, fasting and postprandial blood samples were drawn and 3-d fecal samples were collected. Treatment did not affect changes in total, LDL, and HDL cholesterol compared with control; however, consumption of 3.3 g/d of oat β-glucans for 3 wk resulted in greater decreases in total (-0.29 ± 0.09 mmol/L, P <0.01), LDL (-0.23 ± 0.07 mmol/L, P <0.01), and HDL (-0.05 ± 0.0.3 mmol/L, P <0.05) cholesterol compared with baseline. Changes in LDL in the β-glucan treatments were not related to β-glucan structure (cellotriosyl:cellotetraosyl). Decreases in fasting triacylglycerol were substantially greater after oat β-glucan treatment compared with control (P = 0.03). Fecal dry and wet weight, stool frequency, fecal pH, and energy excretion were unaffected. The results do not fully support the hypocholesterolemic effects by differently structured oat and barley β-glucans. However, substantial differences compared with baseline suggest a potential for oat β-glucan, presumably due to its higher solubility and viscosity. This underlines the importance of elusive structural β-glucan features for beneficial physiologic effects.
AB - β-Glucans are known to exhibit hypocholesterolemic effects. Increased intestinal viscosity is thought to be crucial for cholesterol lowering. It is suggested that concentration, molecular mass, and structure, including the ratio of (1→3) to (1→4) glucan bonds in the molecule, are of importance for β-glucan functionality. This study investigates the effects of 3 different β-glucan sources, incorporated into a beverage and yogurt, on blood lipids and fecal endpoints. Fourteen participants completed this randomized, crossover, single-blinded study with four 3-wk periods: control and 3.3 g/d oat, barley, and barley mutant β-glucans of similar molecular mass. Before and after each period, fasting and postprandial blood samples were drawn and 3-d fecal samples were collected. Treatment did not affect changes in total, LDL, and HDL cholesterol compared with control; however, consumption of 3.3 g/d of oat β-glucans for 3 wk resulted in greater decreases in total (-0.29 ± 0.09 mmol/L, P <0.01), LDL (-0.23 ± 0.07 mmol/L, P <0.01), and HDL (-0.05 ± 0.0.3 mmol/L, P <0.05) cholesterol compared with baseline. Changes in LDL in the β-glucan treatments were not related to β-glucan structure (cellotriosyl:cellotetraosyl). Decreases in fasting triacylglycerol were substantially greater after oat β-glucan treatment compared with control (P = 0.03). Fecal dry and wet weight, stool frequency, fecal pH, and energy excretion were unaffected. The results do not fully support the hypocholesterolemic effects by differently structured oat and barley β-glucans. However, substantial differences compared with baseline suggest a potential for oat β-glucan, presumably due to its higher solubility and viscosity. This underlines the importance of elusive structural β-glucan features for beneficial physiologic effects.
U2 - 10.3945/jn.112.173054
DO - 10.3945/jn.112.173054
M3 - Journal article
C2 - 23946347
VL - 143
SP - 1579
EP - 1585
JO - Journal of Nutrition
JF - Journal of Nutrition
SN - 0022-3166
IS - 10
ER -