The Production of Synbiotic Bread by Microencapsulation.

Area of Science:

• Food Science and Technology
• Microbiology
• Nutritional Science

Background:

• Developing functional foods like probiotic bread is challenging due to high baking temperatures.
• Previous attempts to incorporate viable microorganisms into bread have been unsuccessful.
• Synbiotic foods combine probiotics and prebiotics to enhance health benefits.

Purpose of the Study:

• To create synbiotic bread by microencapsulating probiotics (Lactobacillus acidophilus LA-5 and Lactobacillus casei 431) for enhanced survival during baking.
• To evaluate the impact of microencapsulation techniques and prebiotic addition (inulin) on probiotic viability and bread quality.
• To determine the suitability of synbiotic bread for commercial probiotic product standards.

Main Methods:

• Probiotics were encapsulated using calcium alginate and Hi-maize resistant starch via emulsion, with a chitosan coating.
• Inulin was added as a prebiotic at 5% of wheat flour mass.
• Encapsulated probiotics and inulin were incorporated into hamburger bun and white pan bread doughs before baking.
• Probiotic survival, microcapsule morphology, particle size, and sensory attributes were evaluated.

Main Results:

• Microencapsulation significantly enhanced probiotic viability and thermal resistance in baked bread.
• Lactobacillus casei 431 exhibited higher heat resistance than Lactobacillus acidophilus LA-5.
• The chitosan coating further improved probiotic survival.
• Inulin addition at 5% positively impacted bread texture without affecting flavor.
• Both bread types met criteria for probiotic products, with higher survival in hamburger buns.

Conclusions:

• Microencapsulation is an effective strategy for producing synbiotic bread with enhanced probiotic viability and thermal resistance.
• The combination of calcium alginate, Hi-maize resistant starch, and chitosan provides robust protection for probiotics during baking.
• Inulin serves as an effective prebiotic, improving bread texture and contributing to the synbiotic effect.
• This approach offers a viable method for developing functional probiotic-enriched baked goods.