Production and Characterization of Polyhydroxyalkanoates Obtained by Fermentation of Crude Glycerin From Biodiesel

Figueiredo, Tamiris Vilas Boas; Campos, Márcio Inomata; Sousa, Luciane Santos; Silva, Jaff R. da; Druzian, Janice Izabel

doi:10.5935/0100-4042.20140183

Cited by 8 publications

(13 citation statements)

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“…As observed, there are intense peaks when cheese whey is added to the film, differentiating from the sample PHA/gelatin 3% [Figure (b)]. This result is in accordance with the literature …”

Section: Resultssupporting

confidence: 91%

“…It is considered from these results that the melting temperature ( T m ) of the PHA is consistent with values found in literature for polyhydroxyalkanoates produced from glucose (174–184 °C) . This parameter is important due to the limitations in applications of polymers that present thermal degradation temperature close to the melting temperature in molding processes and that require manipulation of PHA at high temperatures …”

Section: Resultssupporting

confidence: 88%

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Development and characterization of multilayer films based on polyhydroxyalkanoates and hydrocolloids

Andrade

Fonseca

Mei

et al. 2016

J of Applied Polymer Sci

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New biodegradable polymeric materials have been developed in order to minimize the environmental impact caused by the traditional packaging found in the market. Polyhydroxyalkanoates (PHAs) are biopolymers with important features such as biodegradability and biocompatibility; however, the costs associated with PHAs production and the limited mechanical properties reduce their application. Whey is a residual product from dairy industry and gelatin is a biopolymer with good processing characteristics. In this context, a filmogenic solution based on these two biopolymers was incorporated into pure PHA films to improve their optical, mechanical, and structural properties. The filmogenic solution was prepared from gelatin, cheese whey and PHAs, using glycerol as plasticizer agent. The multilayers films (gelatin concentrations at 3 and 5%, w/v) showed higher values for all properties when compared with the PHA standard film. In this sense, the addition of this solution was responsible for the improvement of the film properties. The 5% gelatin multilayers films added of cheese whey and PHAs showed better results when compared with the multilayers films with gelatin at 3%. The film composed of gelatin 5% and cheese whey showed a water vapor permeability ranging from 0.45 g mm/m 2 /d/kPa, elongation of 2.18%, and opacity of 14.5%. However, the results of the morphological analysis showed that both films presented a homogeneous surface without cracks. Moreover, the results of the thermal analysis of both films indicate polymeric miscibility. Thus, the choice of the best film will depend on its applicability.

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“…As observed, there are intense peaks when cheese whey is added to the film, differentiating from the sample PHA/gelatin 3% [Figure (b)]. This result is in accordance with the literature …”

Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 88%

Development and characterization of multilayer films based on polyhydroxyalkanoates and hydrocolloids

Andrade

Fonseca

Mei

et al. 2016

J of Applied Polymer Sci

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“…Figure shows the FT‐IR spectra of pure PHB, PHB/ALG‐e, PHB/PEG, and PHB/ALG‐e/PEG films. It has been well established in the literature that PHB bands at 1721 cm −1 (CO stretching), 1274 cm −1 (COC symmetrical stretching), and 978 cm −1 (CC stretching) are characteristic of crystalline regions, while bands at 1459 cm −1 (CH 3 asymmetric deforming), and 1228 cm −1 (COC stretching) are characteristic of amorphous regions …”

Section: Resultsmentioning

confidence: 97%

“…The efficiency of a dressing is attributed to three important characteristics: flexibility, hydrophobicity/hydrophilicity, and permeability to gases and water vapor . Another system that has been used in the medical field is poly(hydroxybutyrate)(PHB), a bioplastic due to its biocompatibility, non‐toxicity, and biodegradability …”

Section: Introductionmentioning

confidence: 99%

Production and characterization of films containing poly(hydroxybutyrate) (PHB) blended with esterified alginate (ALG‐e) and poly(ethylene glycol) (PEG)

Lopes

Reis

Almeida

2016

J of Applied Polymer Sci

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Alternative materials have long been studied and developed to replace conventional skin dressings with the emergence of new biopolymers and development of polymeric film fabrication techniques. As a new material for polymeric dressings, films of poly(hydroxybutyrate) (PHB) blended with esterified alginate (ALG‐e) and poly(ethyleneglycol) was studied. The esterification of sodium alginate (ALG‐e) generated a material with some amphiphilic characteristics and increased compatibility with the PHB. PEG was added as plasticizer in PHB/ALG‐e films was also tested, since PEG is often used in blends with PHB to improve flexibility and reduce hydrophobicity. At the amounts studied, it was found that both PEG and ALG‐e increase the degree of crystallinity, but a decrease was observed in the hydrophobic nature of PHB films. At the maximum concentration of ALG‐e and PEG used an increase in water vapor permeability and a decrease in tensile strength was reached due to the synergistic effect caused by better homogenization of PEG and ALG‐e in the PHB matrix. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44362.

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“…The species Cupriavidus necator is one of those responding more favorably to the conditions for industrial production. This bacterium can accumulate approximately 80% of its dry mass in polymer and uses different types of substrates, such as glucose, fructose, and crude glycerin (Figueiredo et al, 2014). Biopolymers offer a possible solution for eliminating the problem of the residuals associated with petroleum-based plastic, but for researchers, the real challenge lies not in obtaining these molecules, which are the products of microbial metabolism, but in finding applications that consume large amounts of these materials, promoting price reductions and allowing biopolymers to compete economically in the market (Mohanty et al, 2000).…”

Section: Environmental Technological Microbiologymentioning

confidence: 99%

Technological Microbiology: Development and Applications

Vitorino

Bessa

2017

Front. Microbiol.

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Over thousands of years, modernization could be predicted for the use of microorganisms in the production of foods and beverages. However, the current accelerated pace of new food production is due to the rapid incorporation of biotechnological techniques that allow the rapid identification of new molecules and microorganisms or even the genetic improvement of known species. At no other time in history have microorganisms been so present in areas such as agriculture and medicine, except as recognized villains. Currently, however, beneficial microorganisms such as plant growth promoters and phytopathogen controllers are required by various agricultural crops, and many species are being used as biofactories of important pharmacological molecules. The use of biofactories does not end there: microorganisms have been explored for the synthesis of diverse chemicals, fuel molecules, and industrial polymers, and strains environmentally important due to their biodecomposing or biosorption capacity have gained interest in research laboratories and in industrial activities. We call this new microbiology Technological Microbiology, and we believe that complex techniques, such as heterologous expression and metabolic engineering, can be increasingly incorporated into this applied science, allowing the generation of new and improved products and services.

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Production and Characterization of Polyhydroxyalkanoates Obtained by Fermentation of Crude Glycerin From Biodiesel

Cited by 8 publications

References 0 publications

Development and characterization of multilayer films based on polyhydroxyalkanoates and hydrocolloids

Development and characterization of multilayer films based on polyhydroxyalkanoates and hydrocolloids

Production and characterization of films containing poly(hydroxybutyrate) (PHB) blended with esterified alginate (ALG‐e) and poly(ethylene glycol) (PEG)

Technological Microbiology: Development and Applications

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