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Tenebrio molitor-Derived Enzyme Systems Enable Solvent-Reduced Recovery of Intracellular Polyhydroxyalkanoates.

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Insect enzymes offer a sustainable, solvent-free method for recovering polyhydroxyalkanoates (PHAs) from wet biomass. This approach significantly reduces environmental impact and processing costs for biopolymer production.

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Area of Science:

  • Biotechnology
  • Biochemistry
  • Environmental Science

Background:

  • Polyhydroxyalkanoates (PHAs) are biopolyesters with significant commercial potential.
  • Current downstream processing methods for PHAs are costly and environmentally burdensome, hindering widespread adoption.
  • Efficient and sustainable recovery methods are crucial for the economic viability of PHA production.

Purpose of the Study:

  • To develop a novel, eco-friendly aqueous strategy for recovering PHAs directly from wet bacterial biomass.
  • To investigate the efficacy of crude enzyme systems from Tenebrio molitor for PHA extraction.
  • To assess the impact of this method on polymer integrity and environmental footprint.

Main Methods:

  • Utilized a mild aqueous extraction process using crude enzymes from Tenebrio molitor on wet bacterial biomass.
  • Optimized conditions included enzyme concentration, pH, and temperature for maximum PHA recovery.
  • Employed proteomic analysis to identify key enzymes involved and recombinant validation to confirm their function.
  • Characterized recovered PHAs using gel permeation chromatography, NMR, and thermal analysis.
  • Conducted a life cycle assessment to compare the environmental impact with conventional methods.

Main Results:

  • Achieved near-quantitative recovery (≥95%) of PHB and PHB/HV, and up to 60% recovery of medium-chain-length PHAs (mcl-PHA) without prior biomass drying.
  • Identified digestive hydrolases like α-amylase and cathepsin contributing to polymer release.
  • Demonstrated enhanced mcl-PHA recovery (up to 94%-98%) using targeted enzyme combinations.
  • Confirmed preservation of polymer molecular integrity and crystallinity comparable to chloroform extraction.
  • Life cycle assessment showed a 3- to 7-fold reduction in carbon footprint compared to conventional methods.

Conclusions:

  • Biologically driven biomass hydrolysis using insect-derived enzymes is a scalable and sustainable downstream processing strategy for PHAs.
  • This solvent-free, aqueous method significantly reduces environmental burden and processing costs.
  • Insect enzyme systems present a promising avenue for integrated microbial biopolymer processing.