Biodegradable films with controlled atmosphere extend raspberry shelf life by preserving volatile aroma compounds.

Why It Matters

This research highlights a practical strategy for reducing food waste and improving the economic viability of perishable produce. By understanding how packaging interacts with storage conditions, designers can develop more effective solutions for extending the freshness and appeal of fruits, leading to reduced spoilage and greater consumer satisfaction.

Key Finding

Raspberries stored in biodegradable films under modified atmosphere packaging (MAP) retained their color and aroma better than those in standard packaging, even when subjected to temperature changes, extending their usable life.

Key Findings

• Biodegradable films maintained fruit color parameters close to their initial values after 48 hours of storage.
• Biodegradable films facilitated raspberry storage for up to 96 hours under fluctuating temperatures, maintaining a CO2 concentration between 24.4–25.9 kPa.
• While initial volatile compounds differed, after 96 hours, raspberries stored under passive and active MAP showed similar aroma profiles dominated by terpenes (73% and 62%, respectively).

Research Evidence

Aim: To investigate the impact of different packaging films and modified atmosphere conditions on the quality and volatile aroma compounds of raspberries during storage, particularly under fluctuating temperatures.

Method: Experimental research

Procedure: Raspberries (cv. Himbo Top) were packaged using biodegradable and polypropylene (PP) films under passive and active modified atmosphere packaging (MAP) conditions. The fruits were stored for 96 hours, with an initial 48 hours at 1°C followed by 48 hours at 18°C. A PP macro-perforated film served as a control. Fruit color parameters and volatile compounds were analyzed at different time points.

Context: Food packaging and preservation

Design Principle

Sustainable packaging solutions should actively contribute to product preservation and waste reduction.

How to Apply

When designing packaging for fresh produce, consider using biodegradable films and incorporating modified atmosphere packaging principles, especially for items prone to rapid spoilage or sensitive to temperature fluctuations.

Limitations

The study focused on a specific raspberry cultivar (cv. Himbo Top) and may not be generalizable to all raspberry varieties or other fruits. The specific composition and permeability of the biodegradable films used could influence results.

Student Guide (IB Design Technology)

Simple Explanation: Using special biodegradable wraps and a controlled air environment can keep raspberries fresh for longer, even if the temperature changes.

Why This Matters: This research demonstrates how innovative packaging can directly reduce food waste, a significant global issue, and improve the economic viability of food products.

Critical Thinking: To what extent can the findings on raspberry preservation be extrapolated to other delicate fruits, and what modifications to MAP and film composition might be necessary?

IA-Ready Paragraph: Research indicates that modified atmosphere packaging (MAP) using biodegradable films can significantly extend the shelf life of raspberries by preserving their color and volatile aroma compounds, even under fluctuating storage temperatures. This suggests that material selection and atmospheric control are critical factors in minimizing post-harvest losses for perishable produce.

Project Tips

• When selecting materials for food packaging, consider their impact on shelf life and environmental footprint.
• Investigate how different atmospheric compositions within packaging can affect product quality.

How to Use in IA

• This study provides evidence for the effectiveness of MAP and biodegradable materials in preserving perishable goods, which can inform the selection of materials and packaging strategies in a design project.

Examiner Tips

• Demonstrate an understanding of how material properties and environmental conditions interact to affect product longevity.

Independent Variable: ["Type of packaging film (biodegradable, PP macro-perforated)","MAP condition (passive, active)","Storage temperature profile (1°C then 18°C)"]

Dependent Variable: ["Fruit color parameters (e.g., L value)","Concentration of volatile compounds (e.g., terpenes)","Overall fruit quality (implied by shelf life and aroma profile)"]

Controlled Variables: ["Raspberry cultivar (cv. Himbo Top)","Initial fruit quality","Duration of storage (96 h total)"]

Strengths

• Investigated both packaging material and atmospheric conditions.
• Included a realistic temperature fluctuation scenario.

Critical Questions

• What is the economic feasibility of using active MAP with biodegradable films for commercial raspberry production?
• How do the specific gas permeabilities of the biodegradable films influence the effectiveness of MAP?

Extended Essay Application

• A design project could explore the development of a novel, cost-effective MAP system for local produce markets, drawing on the principles of material science and gas exchange studied here.

Source

Effects of packaging and storage conditions on quality and volatile compounds of raspberry fruits · CyTA - Journal of Food · 2015 · 10.1080/19476337.2015.1011238