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Related Concept Videos

Bioplastics01:27

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...
Microbial Bioremediation of Plastics01:28

Microbial Bioremediation of Plastics

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...
Production of Organic Acids01:25

Production of Organic Acids

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...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...

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Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste
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Published on: July 18, 2025

Bacterial polyhydroxyalkanoates.

S Y Lee1

  • 1Department of Chemical Engineering and BioProcess Engineering Research Center, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, Korea. leesy@sorak. kaist.ac. kr

Biotechnology and Bioengineering
|January 5, 1996
PubMed
Summary
This summary is machine-generated.

Polyhydroxyalkanoates (PHAs) are biodegradable plastics produced by bacteria. Advances in genetic engineering and fermentation aim to reduce PHA production costs, making them competitive with conventional plastics.

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Area of Science:

  • Biotechnology
  • Polymer Science
  • Microbiology

Background:

  • Polyhydroxyalkanoates (PHAs) are bacterial polyesters used for carbon and energy storage.
  • PHAs exhibit diverse mechanical properties based on their monomer composition, offering potential as biodegradable plastics.
  • High production costs currently limit widespread PHA application compared to conventional plastics.

Purpose of the Study:

  • To explore the potential of Polyhydroxyalkanoates (PHAs) as biodegradable plastics.
  • To review advancements in PHA production technologies and strain development.
  • To identify strategies for reducing PHA production costs for market competitiveness.

Main Methods:

  • Review of bacterial PHA synthesis pathways and genetic engineering approaches.
  • Analysis of fermentation and separation technologies for PHA recovery.
  • Investigation of recombinant microbial strains and genetically engineered plants for PHA production.

Main Results:

  • Over 80 hydroxyalkanoates (HAs) have been identified as PHA constituents, enabling tunable material properties.
  • Bacterial production of PHAs has reached productivities exceeding 2 g/L/h.
  • Development of recombinant strains and engineered plants shows promise for enhanced PHA accumulation and diverse monomer incorporation.

Conclusions:

  • Genetic engineering and improved fermentation/separation technologies are key to reducing PHA production costs.
  • Economical PHA production is achievable through optimized bacterial strains and plant-based systems.
  • PHAs have the potential to become cost-competitive biodegradable plastics with further technological advancements.