Biosynthesis and characterization of hydroxybutyrate-hydroxycaproate copolymers

Caballero, Kathryn P.; Karel, Steven F.; Register, Richard A.

doi:10.1016/0141-8130(95)93522-y

Cited by 69 publications

(34 citation statements)

References 20 publications

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“…For these reasons, efforts in compounding PHB are mainly focused on the search of plasticizers and nucleating agents capable of reducing the crystallization process and improving flexibility and elongation in the final product. Figure 3 shows the stress/strain of PHB (H) samples stored at 50% RH for respectively 30 (HC30d) and 60 days (HC60d), and stored at low temperature (HR) (5°C (30)(31)(32)(33)(34)(35). However, pure PHB has had only limited use mainly because of its intrinsic brittleness (presenting low strain at break) and the narrow processing window of this plastic.…”

Section: General Properties Of Polyhydroxyalkanoatesmentioning

confidence: 99%

“…One of the main approaches to improve the properties of PHB is the production of derivatives based on PHB via the biosynthesis of copolyesters containing PHB units with other 3-hydroxyalkanoates units [30], such as poly (3-hydroxybutyrate-cohydroxyvalerate) (PHBV) [31] or poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) [32], with different molar ratios of hydroxycarboxylic acids. This approach has been investigated extensively [33] because it can effectively improve mechanical properties [34] and lower the melting point, avoiding degradation during processing. However, blends with other biodegradable polymers and composites based on PHB that exclude any synthetic component are also very convenient as industrial materials due to their easier processability and lower cost ( [35,36]).…”

Section: General Properties Of Polyhydroxyalkanoatesmentioning

confidence: 99%

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Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Bugnicourt¹,

Cinelli²,

Lazzeri³

et al. 2014

Express Polym. Lett.

772

463

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Abstract. Polyhydroxyalkanoates (PHAs) are gaining increasing attention in the biodegradable polymer market due to their promising properties such as high biodegradability in different environments, not just in composting plants, and processing versatility. Indeed among biopolymers, these biogenic polyesters represent a potential sustainable replacement for fossil fuel-based thermoplastics. Most commercially available PHAs are obtained with pure microbial cultures grown on renewable feedstocks (i.e. glucose) under sterile conditions but recent research studies focus on the use of wastes as growth media. PHA can be extracted from the bacteria cell and then formulated and processed by extrusion for production of rigid and flexible plastic suitable not just for the most assessed medical applications but also considered for applications including packaging, moulded goods, paper coatings, non-woven fabrics, adhesives, films and performance additives. The present paper reviews the different classes of PHAs, their main properties, processing aspects, commercially available ones, as well as limitations and related improvements being researched, with specific focus on potential applications of PHAs in packaging.

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Section: General Properties Of Polyhydroxyalkanoatesmentioning

confidence: 99%

Section: General Properties Of Polyhydroxyalkanoatesmentioning

confidence: 99%

Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Bugnicourt¹,

Cinelli²,

Lazzeri³

et al. 2014

Express Polym. Lett.

772

463

View full text Add to dashboard Cite

show abstract

“…The ratio of carbon and nitrogen as well as the pH of the medium exert significant influence on the metabolism and accumulation of P(3HB) by Bacillus cereus. Synthesis and accumulation of P(3HB) by strains of B. cereus utilizing different carbon sources have been accounted for about 50% of CDW [10][11][12][13][14][15][16][17][18][19]. Moreover, production of co-polymers of 3-hydroxybutyric acid and 3-hydroxyvaleric acid, hydroxybutyric and hydroxycaproic acid and P(3HB) tercopolymers by strains of B. cereus are not uncommon [11,13,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of growth conditions on production of poly(3-hydroxybutyrate) by Bacillus cereus HAL 03 endophytic to Helianthus annuus L.

2016

J App Biol Biotech

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Systematic screening of culturable endophytic bacteria for production of poly(3-hydroxybutyric acid) [P(3HB)] has resulted in the isolation of a potent strain identified as Bacillus cereus HAL 03 (GenBank Accession No. KR869088) from leaf tissue of Helianthus annuus L. Production of P(3HB) by this strain was influenced significantly by the quality as well as quantity of suitable carbon and nitrogen sources in the growth medium. At 2% (w/v) sucrose, the accumulated P(3HB) reached to a level of 50.46 % of its cell dry weight (CDW), whereas yeast extract (0.2%) as nitrogen source enhanced P(3HB) production and accounted for 53.19% of CDW. Moreover, the non-conventional carbon sources such as molasses further increased the production of the polyester up to 54.05% of its CDW. Finally, the identity of this intracellularly accumulated polyester was confirmed as a homopolymer of 3(hydroxybutyric acid) by the Fourier-transform infrared and proton nuclear magnetic resonance spectroscopic analysis. This study appears to indicate the first ever report of P(3HB) production by any strain of B. cereus endophytic to H. annuus L.

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“…The chloroform was allowed to evaporate overnight at room temperature. The film was further dried under vacuum at 70°C for 2 h (Caballero et al 1995), and the thickness of the film was 0.05 -0.08 mm.…”

Section: Methodsmentioning

confidence: 99%

Effects of glucose and glycine on the biodegradation of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB / V) and the proliferation of PHB / V-degrading microorganisms in soil suspension

Song

Wang

Ono

et al. 2002

Soil Science and Plant Nutrition

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Biosynthesis and characterization of hydroxybutyrate-hydroxycaproate copolymers

Cited by 69 publications

References 20 publications

Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Polyhydroxyalkanoate (PHA): Review of synthesis, characteristics, processing and potential applications in packaging

Influence of growth conditions on production of poly(3-hydroxybutyrate) by Bacillus cereus HAL 03 endophytic to Helianthus annuus L.

Effects of glucose and glycine on the biodegradation of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB / V) and the proliferation of PHB / V-degrading microorganisms in soil suspension

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