Development and validation of a new artificial gastric digestive system

Area of Science:

• Biotechnology
• Food Science
• Digestive Physiology

Background:

• The stomach is crucial for food storage, mixing, and initial digestion.
• Understanding gastric digestion dynamics is vital for food science and development.
• Existing in vitro models often lack the complexity of physiological gastric motility and pH control.

Purpose of the Study:

• To develop and validate a novel artificial gastric digestive system (AGDS) that accurately mimics human stomach function.
• To investigate the effects of simulated gastric motility and pH on protein (α-lactalbumin) digestion.
• To compare the AGDS with static and semi-dynamic digestion models.

Main Methods:

• Utilizing 3D digital technology to create an AGDS with human stomach shape and structure.
• Employing rollers to simulate gastric peristalsis and a pH-stat workstation for precise pH control.
• Analyzing protein hydrolysis, peptide and amino acid accumulation, and pepsin activity under different digestion conditions.

Main Results:

• The AGDS demonstrated distinct protein, peptide, and amino acid profiles compared to static and semi-dynamic models.
• Simulated gastric motility and pH significantly influenced protein hydrolysis, especially early pepsin activity.
• Mechanical analysis and in vitro experiments validated the AGDS's ability to provide a true digestion profile.

Conclusions:

• The AGDS accurately reflects gastric digestion, including the impact of motility and pH on protein breakdown.
• Gastric motility plays a key role in modulating pepsin activity during the initial stages of digestion.
• The AGDS serves as a valuable dynamic in vitro model for food development and research.