Bioplastics from Polybutylene Succinate (PBS) with Added Oils Extend Food Shelf Life

Why It Matters

This research offers a pathway to developing more sustainable food packaging solutions by utilizing biodegradable materials that also contribute to food preservation. This can lead to reduced food waste and a decreased reliance on petroleum-based plastics.

Key Finding

Bioplastics made from PBS with natural oils not only offer a biodegradable alternative to conventional plastics but also actively help preserve food by slowing down oxidation and preventing mold growth for extended periods.

Key Findings

• PBS bioplastics with added EVO and CO showed improved chemico-physical properties.
• The bioplastic films effectively reduced browning in sliced apples and kiwis due to oxidation.
• No mold growth was observed on the wrapped fruit for up to 10-12 days.
• The formulation with 3 wt% EVO demonstrated the most significant positive outcomes in food preservation.

Research Evidence

Aim: To investigate the potential of polybutylene succinate (PBS) bioplastics, modified with varying percentages of extra virgin olive oil (EVO) and coconut oil (CO), for use in food packaging, focusing on their impact on food preservation and material properties.

Method: Experimental research involving material preparation, characterization, and food-contact testing.

Procedure: Thin films of polybutylene succinate (PBS) were prepared with 1%, 2%, and 3% by weight of extra virgin olive oil (EVO) and coconut oil (CO). The films were characterized using ATR/FTIR spectroscopy for chemical interactions, mechanical and thermal analysis for property evaluation, and SEM for surface morphology. Finally, sliced apples and kiwis were wrapped in the films and observed for 12 days to assess oxidation and microbial contamination.

Context: Food packaging and materials science

Design Principle

Biodegradable materials can be engineered with functional additives to provide active benefits beyond containment, such as extending product shelf life.

How to Apply

When developing new food packaging, test the inclusion of natural oils in biodegradable polymer matrices to assess their impact on product shelf life and material properties.

Limitations

The study focused on specific fruits (apple and kiwi) and a limited range of oil concentrations. Long-term stability and performance under various environmental conditions were not extensively explored.

Student Guide (IB Design Technology)

Simple Explanation: Making plastic from plants (bioplastics) can be made even better by adding natural oils, which helps keep food fresh for longer and stops it from going bad.

Why This Matters: This research shows how to create packaging that is better for the environment and also helps reduce food waste, which are important considerations for any design project.

Critical Thinking: How might the cost-effectiveness of incorporating natural oils into bioplastics compare to traditional food preservation methods?

IA-Ready Paragraph: This research demonstrates that polybutylene succinate (PBS) bioplastics, when enhanced with natural oils like extra virgin olive oil, can significantly improve food preservation by reducing oxidation and inhibiting microbial growth, offering a sustainable solution for food packaging.

Project Tips

• When selecting materials for a design project, consider the environmental impact and potential for added functionality.
• Investigate how natural additives can enhance the performance of sustainable materials.

How to Use in IA

• Use this research to justify the selection of biodegradable materials and to explore innovative ways to enhance their performance in your design project.

Examiner Tips

• Demonstrate an understanding of how material properties can be tailored to achieve specific functional outcomes, such as improved food preservation.

Independent Variable: ["Type of natural oil (EVO, CO)","Percentage of natural oil added (1%, 2%, 3%)"]

Dependent Variable: ["Mechanical properties of the bioplastic films","Thermal behavior of the bioplastic films","Surface morphology of the bioplastic films","Degree of oxidation in wrapped fruit","Presence of microbial contamination (mold) on wrapped fruit"]

Controlled Variables: ["Base polymer (PBS)","Type of fruit used for testing (apple, kiwi)","Duration of food-contact test (12 days)","Environmental conditions during testing"]

Strengths

• Investigated a novel combination of materials for bioplastic development.
• Included a practical food-contact test to evaluate real-world performance.

Critical Questions

• What are the potential sensory impacts (taste, smell) of the added oils on the packaged food?
• How does the biodegradability of the modified bioplastic compare to unmodified PBS?

Extended Essay Application

• Investigate the potential for using locally sourced natural oils to create custom bioplastic food packaging for specific regional produce, considering both environmental benefits and economic viability.

Source

Preparation and Characterization of New Bioplastics Based on Polybutylene Succinate (PBS) · Polymers · 2023 · 10.3390/polym15051212