In Vitro Gastrointestinal Digestion Models

In vitro gastrointestinal digestion models are laboratory systems designed to replicate the physicochemical and biochemical processes of the human digestive tract. They span from static protocols—where oral, gastric and intestinal phases proceed under fixed pH, enzyme and bile salt conditions—to semi-dynamic and fully dynamic systems that introduce gradual acidification, fluid secretion, mixing and transit times. By mimicking enzymatic hydrolysis, bile-mediated emulsification and mechanical forces, these models enable detailed study of macronutrient breakdown, micronutrient release and bioactive compound bioaccessibility. Standardised approaches have enhanced reproducibility and comparability across laboratories, while dynamic platforms improve physiological relevance. Applications include formulation of functional foods, evaluation of nutraceutical efficacy, safety assessment of contaminants and optimisation of targeted delivery systems for pharmaceuticals and bioactives.

Research from Nature Portfolio

A seminal standardised protocol has established a static in vitro method that applies consensus physiological parameters across oral, gastric and intestinal phases using fixed ratios of meal to digestive fluids, defined pH values and incubation times. This benchmark procedure enables reproducible assessment of protein, lipid and carbohydrate hydrolysis, quantification of peptides, fatty acids and simple sugars, and evaluation of micronutrient solubilisation within a streamlined workflow. Recent refinements have clarified enzyme activity assays, improved sample handling and broadened applicability to diverse food matrices, consolidating this method as the gold standard for mechanistic investigations into digestion kinetics and nutrient bioaccessibility.

In Vitro Gastrointestinal Digestion Models publication trend

The graph below shows the total number of articles in in vitro gastrointestinal digestion models across all publications each year (not limited to Nature Index journals).

Technical terms

INFOGEST protocol: A consensus static in vitro digestion method employing standardised enzyme, bile salt and pH conditions for sequential oral, gastric and intestinal phases.

Static model: A digestion system with fixed parameters and no temporal variation in pH, enzyme concentration or fluid flow.

Semi-dynamic model: A hybrid system introducing gradual pH changes, controlled enzyme secretion and fluid turnover to better mimic in vivo gastric processes.

Bioaccessibility: The fraction of a nutrient or bioactive compound released from the food matrix during digestion and rendered available for absorption.

Caco-2 monolayers: Differentiated human intestinal epithelial cells used in vitro to assess transport and absorption of nutrients and compounds across the gut barrier.

References

1. Applications of the INFOGEST In Vitro Digestion Model to Foods: A Review. Annual Review of Food Science and Technology (2023).
2. Coupling in vitro food digestion with in vitro epithelial absorption; recommendations for biocompatibility. Critical Reviews in Food Science and Nutrition (2023).
3. INFOGEST static in vitro simulation of gastrointestinal food digestion. Nature Protocols (2019).
4. A standardised semi-dynamic in vitro digestion method suitable for food – an international consensus. Food & Function (2020).