Evaluation of the functional properties and shelf-life enhancement of plant-based yogurt alternatives using natural plant-based coagulants and novel stabilization techniques.

Project Abstract

The study investigates the functional properties and shelf-life enhancement of plant-based yogurt alternatives through the application of natural plant-based coagulants and novel stabilization techniques, aiming to address consumer demand for sustainable, allergen-friendly dairy alternatives with superior texture, viscosity, and microbial stability. A multidisciplinary approach was employed to optimize coagulation efficiency, gel formation, and syneresis control using plant-derived coagulants such as roasted legume seeds, leguminous flour extracts, and enzyme-assisted extracts, coupled with stabilizers including hydrocolloids and native polysaccharides derived from plant sources. A factorial experimental design evaluated the effects of coagulant type and concentration, thermal treatment, homogenization pressure, and stabilization additive combinations on key physicochemical properties, including pH, water-holding capacity, rheological behavior, textural profile analysis, and microstructure using confocal laser scanning microscopy and scanning electron microscopy. Fourier transform infrared spectroscopy and differential scanning calorimetry were used to assess protein–polysaccharide interactions and thermal stability of the gel networks. The study also quantified fermentation kinetics, acidification rate, and the resulting syneresis over refrigerated storage (0–28 days) at 4°C and 8°C to simulate household and retail conditions. Microbiological analyses focused on lactic acid bacteria viability, spoilage flora, and shelf-life endpoints defined by pH thresholds, viscosity changes, and sensory acceptability. Sensory framework employed a trained panel and consumer testing to evaluate appearance, aroma, flavor, mouthfeel, and overall liking, with a hedonic scale and just-right calibration to determine optimal processing parameters that maximize consumer acceptance while maintaining nutritional integrity. The results indicate that specific plant-based coagulants interact synergistically with selected stabilizers to form cohesive gel networks that reduce whey separation and enhance creaminess without compromising alleviated aftertaste or nutrient retention. Notably, coagulants derived from roasted seeds exhibited high proteolytic activity that facilitated gel cross-linking in concert with carrageenan- or alginate-like stabilizers, producing a stable emulsion gel with improved rheological moduli and desirable syneresis reduction. Shelf-life extension was achieved through optimized low-pH fermentation strategies and stabilized gel matrices that inhibited microbial spoilage and retardation of textural degradation during storage. The optimized formulation demonstrated improved water-holding capacity, increased apparent viscosity at low shear rates, and a cohesive, smooth mouthfeel comparable to conventional dairy yogurts, while delivering comparable or enhanced protein and dietary fiber content and lower saturated fat. Economic analysis highlighted cost-effective sourcing of plant coagulants, scalability of processing steps, and potential reductions in environmental impact due to plant-based procurement. Overall, the research provides a robust framework for developing shelf-stable, consumer-acceptable plant-based yogurt alternatives with enhanced functional properties, offering a viable pathway for industry adoption and contributing to the broader goals of sustainable food systems and dietary diversification.

Project Overview

What This Project Is About

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A straightforward study of plant-based yogurt alternatives. It looks at how natural plant-based coagulants (substances that help yogurt form) and new stabilization methods affect texture, taste, nutrition, and how long the product stays good on the shelf.

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The Problem It Addresses

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Plant-based yogurts often face consistency issues and shorter shelf life compared to dairy yogurts. This project seeks better stabilizers and more reliable coagulation to improve texture and extend freshness, benefiting both producers and consumers who want tasty, reliable dairy-free options.

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Objectives of the Project

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1. Assess different natural coagulants for forming a smooth yogurt gel from plant-based milk
2. Test stabilization techniques to reduce separation and improve mouthfeel
3. Evaluate texture, viscosity, and basic sensory attributes over storage time
4. Determine how coagulants and stabilizers influence nutritional content
5. Identify the best combination for extended shelf life without compromising quality

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What You Will Do Step by Step

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1. Review simple literature on plant-based coagulants and stabilizers

2. Prepare plant-based yogurt samples with different coagulants

3. Apply stabilization methods and control samples

4. Measure texture, consistency, and syneresis (weeping) over time

5. Perform basic taste checks and note consumer impressions

6. Analyze data to compare options and identify the best-performing combo

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Expected Outcome

Anticipated finding of a practical combination that improves texture and extends shelf life of plant-based yogurts, with guidance for product development and potential market impact.