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Related Concept Videos

Bioplastics01:27

Bioplastics

42
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...
42
Production of Organic Acids01:25

Production of Organic Acids

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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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Microbial Bioremediation of Plastics01:28

Microbial Bioremediation of Plastics

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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...
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Biofuels01:25

Biofuels

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The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
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Upstream Processing01:27

Upstream Processing

73
Upstream processing represents a critical phase in biomanufacturing, wherein biological systems such as microorganisms, mammalian cells, or insect cells are cultivated to produce therapeutic proteins, vaccines, enzymes, or other biologically derived products. This phase encompasses all steps from the selection and genetic manipulation of the production organism to the cultivation of cells in bioreactors under tightly controlled environmental conditions.Host Selection and Genetic OptimizationThe...
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Microbial Bioremediation of Hydrocarbons01:26

Microbial Bioremediation of Hydrocarbons

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Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to...
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Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste
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Polyhydroxyalkanoate production from solid waste animal fat and biological downstream processing: A pilot-scale

Lara Santolin1, Björn Weiske1, Manoj Lakshmanan2

  • 1Technische Universität Berlin, Chair of Bioprocess Engineering, Berlin, Germany.

Bioresource Technology
|March 27, 2026
PubMed
Summary

Waste animal fat can be converted into high-purity polyhydroxyalkanoates (PHAs) using bacterial fermentation and mealworm processing. This circular economy approach yields valuable bioplastics from waste materials.

Keywords:
Biological recoveryCupriavidus necatorFed-batch fermentationPHAPoly(hydroxybutyrate-co-hydroxyhexanoate)Scale-upSecond generation feedstock

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Area of Science:

  • Biotechnology
  • Polymer Science
  • Circular Economy

Background:

  • Transitioning to a circular economy requires sustainable alternatives to conventional plastics.
  • Polyhydroxyalkanoates (PHAs) are biodegradable bioplastics with significant potential.
  • Utilizing waste streams for biopolymer production is crucial for economic viability.

Purpose of the Study:

  • To demonstrate the pilot-scale feasibility of producing poly(hydroxybutyrate-co-hydroxyhexanoate) (P(HB-co-HHx)) from waste animal fat (WAF).
  • To evaluate a novel biological downstream processing method using mealworms for PHA recovery.
  • To assess the purity and molecular weight stability of PHA produced via this integrated process.

Main Methods:

  • Fed-batch fermentation of engineered Cupriavidus necator Re2058/pCB113 using WAF at a 750-L pilot scale.
  • Biological downstream processing of PHA-rich biomass using Tenebrio molitor (mealworms).
  • Material characterization of the final PHA powder, including purity and molecular weight analysis.

Main Results:

  • Production of 48 kg of PHA-rich dried cells from WAF.
  • Recovery of 19 kg of high-purity (>99%) PHA powder using mealworm processing.
  • Confirmation of stable PHA molecular weight throughout the downstream process.

Conclusions:

  • Waste animal fat is a viable feedstock for pilot-scale PHA production.
  • Mealworm-based biorecycling offers an efficient and sustainable method for PHA downstream processing.
  • This integrated approach supports the development of a circular bioeconomy by valorizing waste into high-value bioplastics.