Bioavailability of glucose from Palatinit

Area of Science:

• Nutritional biochemistry
• Metabolic studies
• Food science

Background:

• Palatinit is a sugar substitute composed of D-glucosyl-alpha-(1 to 1)-D-mannitol and D-glucosyl-alpha-(1 to 6)-D-glucitol.
• Understanding the metabolic fate of Palatinit is crucial for assessing its physiological impact.
• Previous studies have not fully elucidated the glucose bioavailability from Palatinit components.

Purpose of the Study:

• To determine the glucose bioavailability of Palatinit's components, D-glucosyl-alpha-(1 to 1)-D-mannitol and D-glucosyl-alpha-(1 to 6)-D-glucitol.
• To investigate the metabolic pathways and factors influencing glucose absorption from these compounds.
• To assess the suitability of a glucose bioavailability assay for evaluating sugar substitutes.

Main Methods:

• Utilized ketotic rats for glucose bioavailability assays.
• Employed the established procedure by Karimzadegan et al.
• Quantified conversion rates of Palatinit components into glucose and assessed preformed glucose moiety bioavailability.

Main Results:

• D-glucosyl-alpha-(1 to 6)-D-glucitol showed 42% conversion to glucose, while D-glucosyl-alpha-(1 to 1)-D-mannitol showed 39%.
• Bioavailability of the preformed glucose moiety was 36% for glucosylmannitol and 32% for glucosylglucitol.
• Lower-than-theoretical bioavailability was attributed to microbial fermentation in the hindgut.

Conclusions:

• Palatinit components do not fully contribute their carbohydrate content to the metabolic glucose pool.
• Microbial activity in the large intestine significantly impacts glucose bioavailability from Palatinit.
• The glucose bioavailability assay provides deep metabolic insight and is recommended for food safety assessments of sugar substitutes.