Protease Inhibitors in Processed Plant Foods.

Area of Science:

• Biochemistry
• Toxicology
• Nutrition

Background:

• Plants, particularly legumes like soybeans, contain various protease inhibitors.
• Serine protease inhibitors (trypsin, chymotrypsin) from legumes are well-studied.
• These inhibitors in unheated proteins have known biological effects.

Purpose of the Study:

• To summarize the known effects of plant protease inhibitors.
• To address the nutritional and toxicological significance of these compounds.
• To clarify the safety of processed plant proteins.

Main Methods:

• Literature review of studies on plant protease inhibitors.
• Analysis of effects on nutritional quality.
• Examination of toxicological impacts in animal models.
• Assessment of processed food safety.

Main Results:

• Unheated legume proteins with inhibitors impair nutritional quality.
• Inhibitors can induce pancreatic hypertrophy and enhance carcinogen action in specific animals.
• Some studies report pancreatic carcinogenicity and tumor inhibition.
• Commercially processed plant proteins have low, nutritionally insignificant inhibitor levels.

Conclusions:

• While unheated plant protease inhibitors have significant biological effects, their levels in processed foods are of no nutritional concern.
• Further research is needed on the physiological significance of residual inhibitors in processed foods.
• Plant-derived protease inhibitors warrant continued study for both their risks and potential benefits.