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Bioplastics

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...

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Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...

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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...

Microbes in Food Production

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Microbial fermentation is central to food biotechnology, enhancing flavor, texture, preservation, and stability. Fermentative microorganisms metabolize carbohydrates into organic acids, alcohols, and other metabolites that inhibit spoilage organisms and improve digestibility while contributing distinctive sensory qualities.In baking, amylases naturally present in flour hydrolyze starch into monosaccharides such as glucose, which Saccharomyces cerevisiae ferments anaerobically. Through...

Microbes in the Production of Fermented Foods

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Related Experiment Video

Updated: Jun 27, 2026

Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste

Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste

Published on: July 18, 2025

[Polyhydroxyalkanoates microbiological synthesis from food wastes].

Meng-meng Cai¹, Hong Chua, Ai-ling Phoeby Wong

¹School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. cmm_hit@126.com

Huan Jing Ke Xue= Huanjing Kexue

|December 17, 2008

Summary

Utilizing food waste for polyhydroxyalkanoates (PHAs) production is feasible. Different microorganisms and waste streams yield PHAs with varying properties, impacting production costs.

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Area of Science:

Biotechnology
Microbiology
Polymer Science

Context:

Polyhydroxyalkanoates (PHAs) are biodegradable polymers with potential applications in various industries.
Reducing PHA production costs is crucial for their widespread adoption.
Food waste represents an abundant and low-cost carbon source for microbial PHA synthesis.

Purpose:

To evaluate the feasibility and analyze the physicochemical properties of PHAs synthesized by different microorganisms (Alcaligenes latus, Staphylococcus epidermidis, activated sludge) using various food wastes.
To optimize PHA production through two-stage fed-batch fermentation and controlled conditions.

Summary:

Maximum PHA yields from malt waste were 70.1% (A. latus), 16.0% (S. epidermidis), and 43.3% (activated sludge).
A. latus demonstrated rapid adaptation to food wastes and higher PHA yield under nitrogen limitation.
S. epidermidis produced polyhydroxybutyrate (PHB) with high molecular weight (>1x10^6 Da) from sesame oil waste.
Activated sludge synthesized polyhydroxybutyrate-co-hydroxyvalerate (PHBV) copolymer (21% HV) from soy waste.
The study confirms that most food wastes are suitable for PHA synthesis, with properties influenced by microbial strain, substrate, and fermentation conditions.

Impact:

This research highlights the potential of using diverse food wastes as sustainable feedstocks for cost-effective PHA production.
The findings provide insights into tailoring PHA properties by selecting specific microorganisms and optimizing fermentation parameters.
Successful valorization of food waste into bioplastics contributes to a circular economy and waste reduction efforts.