Upcycled Eggplant Peel Extract Enhances Antioxidant Properties but Reduces Palatability in Dairy Desserts

Why It Matters

This research highlights a trade-off in using food waste streams for functional ingredient development. While it offers a sustainable approach to valorize byproducts and enhance nutritional profiles, designers must carefully consider the sensory implications to ensure market viability.

Key Finding

Adding eggplant peel extract to rice pudding improved its health-related compounds like antioxidants but made it less appealing to consumers.

Key Findings

• Higher concentrations of fenugreek gum and eggplant peel extract improved syneresis percentage, indicating reduced water release and better storage stability.
• Fenugreek gum addition positively correlated with increased storage stability.
• Eggplant peel extract increased monomeric anthocyanins, total phenolics, total flavonoids, and antioxidant activity.
• Consumer acceptance scores for products with eggplant peel extract were reported to be very low.

Research Evidence

Aim: To investigate the effects of fenugreek gum and eggplant peel extract on the physicochemical, storage, bioactive, and sensory properties of a dairy dessert.

Method: Experimental design with varying concentrations of additives.

Procedure: Rice pudding was formulated with different levels of fenugreek gum (0%, 0.2%, 0.4%) and eggplant peel extract (0%, 0.25%, 0.5%). Various properties including total soluble solids, pH, color, syneresis, storage stability, total phenolic content, antioxidant activity, flavonoid, anthocyanin content, and sensory acceptance were measured.

Context: Food product development, dairy desserts, ingredient innovation.

Design Principle

Maximize resource utilization by valorizing food byproducts, but validate sensory impact to ensure product success.

How to Apply

When developing new food products or reformulating existing ones with functional ingredients derived from food waste, conduct thorough sensory analysis alongside nutritional assessments.

Limitations

The study focused on a specific dairy dessert (rice pudding) and may not generalize to all food products. The sensory evaluation used a 5-point hedonic scale, which might not capture nuanced consumer preferences.

Student Guide (IB Design Technology)

Simple Explanation: Using parts of vegetables like eggplant peels that are usually thrown away can make food healthier by adding antioxidants, but people might not like the taste as much.

Why This Matters: This shows how designers can make products more sustainable and healthier, but also highlights the importance of making sure people actually want to eat them.

Critical Thinking: How can designers mitigate the negative sensory impacts of functional, upcycled ingredients to achieve both health and market success?

IA-Ready Paragraph: Research indicates that while upcycled ingredients like eggplant peel extract can enhance the nutritional profile of food products by increasing antioxidant content, their incorporation may lead to a significant decrease in consumer acceptance due to altered sensory attributes. This suggests a critical need for careful formulation and sensory evaluation when designing with sustainable food waste streams.

Project Tips

• Consider using food waste as a source for functional ingredients in your design project.
• Plan for comprehensive sensory testing to understand user perception.

How to Use in IA

• Reference this study when exploring the use of upcycled ingredients for functional benefits in your design project, particularly if you encounter trade-offs between nutritional enhancement and sensory appeal.

Examiner Tips

• Demonstrate an understanding of the balance between functional benefits (e.g., nutritional enhancement) and user experience (e.g., sensory appeal) when incorporating novel or sustainable ingredients.

Independent Variable: ["Concentration of fenugreek gum","Concentration of eggplant peel extract"]

Dependent Variable: ["Physicochemical properties (e.g., total soluble solids, pH, color, syneresis)","Storage stability","Bioactive compounds (phenolics, flavonoids, anthocyanins)","Antioxidant activity","Sensory acceptance"]

Controlled Variables: ["Base dairy dessert formulation (rice pudding)","Storage conditions"]

Strengths

• Investigated a wide range of properties, from physical to sensory.
• Included multiple concentrations of two different additives.

Critical Questions

• What specific sensory attributes were negatively affected by the eggplant peel extract, and could these be masked or improved through other formulation adjustments?
• Are there alternative processing methods for eggplant peel extract that might yield similar bioactive benefits with less impact on flavor?

Extended Essay Application

• An Extended Research project could investigate optimizing the extraction and incorporation methods of eggplant peel extract to improve sensory appeal while retaining its functional benefits, potentially through encapsulation or blending with other flavor enhancers.

Source

Effect of Fenugreek Gum and Eggplant Peel Extract on Physicochemical, Storage, Bioactive, and Sensory Properties of Dairy Dessert · Turkish Journal of Agriculture - Food Science and Technology · 2023 · 10.24925/turjaf.v11i12.2323-2331.6300