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Effect of prolonged consumption of lactose or hydrolyzed lactose in rats 2. digestibility retention and metabolic utilization of lactose components

, : Effect of prolonged consumption of lactose or hydrolyzed lactose in rats 2. digestibility retention and metabolic utilization of lactose components. International Journal for Vitamin and Nutrition Research 52(1): 96-101

Nutritional balance was achieved with groups of 12 Wistar rats receiving well-balanced diets with 40% sucrose (T), or 40% lactose (L and P), or hydrolyzed lactose (LH and PH). Whey (L) and ultrafiltration permeate (P) were used in crude state or after enzymic industrial lactase hydrolysis (LH and PH). The animals consumed the diets over 8 mo. Feces contained neither lactose nor galactose, but glucose in small quantities. All urine samples contained .apprx. 0.5 mg/day glucose. The lactose diets (L and P) provoked a weak lactosuria (0.36% of ingestion). Galactose and galactitol were abundant in urine: with lactose diets (L and P), the urinary excretion was 4% of ingested galactose. In urine from the hydrolyzed lactose diet groups (LH and PH) the excretion reached 26% of ingestion. In this case, the excretion was remarkably constant from the 3rd day to the 8th month. Urinary galactose was 23% and galactitol 3% of consumed galactose. The urine of lactose diets (L and P) and hydrolyzed lactose diets (LH and PH) contained 100 and 300 mg/day of non-sugar reducing substances, respectively, i.e., 40% of total urinary reducing power. The apparent retention of lactose (L and P) is 95.5% and that of the hydrolyzed lactose (LH and PH) is 86% after 8 mo. of experiment. The digestive flora probably consumes 40% of dietary lactose (L and P).

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