This paper indicates that activated sludge under certain conditions can achieve levels of polyhydroxyalkanoates (PHA) accumulation which would enable the economic recovery of this precursor of biodegradable plastics. The effects of C/N ratio and temperature on polyhydroxyalkanoates production were evaluated. Acetate uptake, ammonium consumption, oxygen uptake and PHA production were studied und...

Polyhydroxyalkanoates (PHA) are a family of bio polyesters synthesized by many types of bacteria as carbon and energy reserve materials, Anderson AJ et al (1990). PHA can be divided into three classes depending on the number of carbon atoms in their monomer units; shortchain-length (SCL), medium-chain-length (MCL) and longchain-length polyhydroxyalkanoates (LCLPHAs), composed by hydroxyacids. P...

the article addresses the contemporary quest for inexpensive carbon feedstocks to be used for cost efficient biomediated polymer production; such polymers can potentially be applied in the food technology sector, mainly for packaging purposes. in particular, the work shines a light on crude glycerol, a surplus stream of the globally tremendously emerging biodiesel industry. crude glycerol can b...

the potential and performance of various gram-negative, gram-positive and archaeal wild type microorganisms, and bacterial mixed cultures, as well as the application of genetically engineered strains as whole-cell biocatalysts for glycerol-based polyhydroxyalkanoate production are analyzed and assessed. this encompasses the comparison of growth and polyhydroxyalkanoate accumulation kinetics, th...

Polyhydroxyalkanoates (PHA) are diverse polyesters synthesized by a variety of bacteria as intracellular carbon and energy storage compounds. As bio-renewable and biodegradable materials with diverse properties, PHA have drawn industrial attentions for their potential applications in many fields. This review focuses on recent strain developments for PHA production via cofactor engineering and m...

Polyhydroxyalkanoates (PHA) envisage a potential biomaterial alternative to replacing synthetic polymers for their biodegradability and biocompatibility. Modification approaches exploit the attributes adjust intrinsic hydrophobic properties, such as blending produce new polymer mix with novel properties. Functionalization of PHA, especially chemical grafting, perform introduce additional compou...

Abstract Polyhydroxyalkanoates (PHA) produced by many bacteria have been investigated by microbiologists, molecular biologists, biochemists, chemical engineers, chemists, polymer experts, and medical researchers over the past many years. Applications of PHA as bioplastics, fine chemicals, implant biomaterials, medicines, and biofuels have been developed. Companies have been established or invol...

Polyhydroxyalkanoates (PHAs) is reported as polyesters of hydroxyalkanoates (HAs) which is generally synthesized by numerous bacteria and it is stored in the cytoplasm of cells as an intracellular carbon and energy sources compound. It has been considered as a replacement for conventional plastics. Microbial cell such as Alcaligenes, Pseudomonas, recombinant Escherichia coli and methylotrophs a...

A gas chromatography-mass spectrometry method for quantification of polyhydroxyalkanoates (PHAs), containing 4-carbon to 16-carbon monomers, even in the absence of standards, was developed. Strong linear correlations existed between PHA carbon number and retention time/response factor (R(2) ≥ 0.987). Based on the correlations, high recovery values, between 100.5% and 114.3%, were obtained for P...