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1

Polymer biodegradation and biodegradable polymers - a review

100%
Leja K., Lewandowicz G.
Polish Journal of Environmental Studies
|
2010
|
tom 19
|
nr 2
255-266
Synthetic polymers are important in many branches of industry, for example in the packaging industry. However, they have an undesirable influence on the environment and cause problems with waste deposition and utilization. Thus, there is a tendency to substitute such polymers with polymers that undergo biodegradable processes. Increasing interest in applying polymers based on natural materials such as starch has been observed. This review describes biodegradation processes of xenobiotics such as aromatic compounds, plastics (PVA, polyesters, polyethylene, and nylon), and polymer blends (Starch/Polyethylene, Starch/Polyester, and Starch/PVA). Moreover, this review includes information about biodegradable polymers such as mixtures of synthetic polymers and substances that are easy digestible by microorganisms (chemically modified starch, starch-polymer composites, thermoplastic starch, and biodegradable packing materials), synthetic materials with groups susceptible to hydrolytic microbial attack (polycaprolactone), and biopolyesters (poly-β-hydroxyalkanoates). Production of this kind of material and introducing it to the market is important for the natural environmental. It may result in decreasing the volume of waste dumps.
2

Poly-lactide-co-glycolide microspheres and natural phospholipid liposomes in the context of vaccinology

100%
Quintilio W., Sant'Anna O.A., Takata C. S., Lopes A. C., Bueno da Costa M. H.
Cellular and Molecular Biology Letters
|
2005
|
tom 10
|
nr Suppl.
3

Biodegradation of starch-modified foil in natural conditions

84%
Domka L., Malicka A., Jagla K., Kozak A.
Polish Journal of Environmental Studies
|
2009
|
tom 18
|
nr 2
191-195
The biodegraded foils based on starch and containing different fillers to improve the foil properties have been studied. The foil resistance to solvents of different character, their susceptibility to biodegradation in compost and in the soil, in natural conditions, have been determined. The foil quality and rate of their degradation have been observed under an electron microscope (SEM images).
4

Susceptibility of poly (epsilon-caprolactone) to environmental degradation in open and harbour area of the Baltic Sea

84%
Krasowska K., Suchocka K., Rutkowska M.
Towaroznawcze Problemy Jakości. Polskie Towarzystwo Towaroznawcze
|
2014
|
nr 1
5

Biosynthesis of polyhydroxyalkanotes in wild type yeasts

84%
Abd-El-Haleem D. A. M.
Polish Journal of Microbiology
|
2009
|
tom 58
|
nr 1
37-41
Biosynthesis of biodegradable polymers polyhydroxyalkanotes (PHAs) have been studied extensively in wild type and genetically modified prokaryotic cells, however the content and structure of PHAs in wild type yeasts is not well documented. The purpose of this study was to screen yeast isolates collected from different ecosystems for their ability to accumulate PHAs. Identification of the isolates and characterization of PHAs produced by the positive isolates were investigated. One positive isolate (strain Y4) was identified by both API20C system and 18S rDNA sequencing. The data revealed that isolate Y4 belongs to the yeast genus Rhodotorula and exhibits 18S rDNA similarity value >99% to the species Rhodotorula minuta. Quantification of PHAs yield of strain Y4 in glucose, oleic acid and tween 60 containing medium for over a growth period of 96 h gave 2% of PHAs in biomass. The nature of produced PHAs was analyzed by infrared spectroscopy and nuclear magnetic resonance (¹H and ¹³C NMR) and found to contain polyhydroxybutyrate and polyhydroxyvalerate (PHBV).
6
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Selected mechanical properties of starch films

84%
Combrzynski M., Moscicki L., Rejak A., Wojtowicz A., Oniszczuk T.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
|
2013
|
tom 13
|
nr 2
7
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The physical properties of starch biocomposite containing PLA

84%
Combrzynski M., Moscicki L.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
|
2013
|
tom 13
|
nr 2
8

Assessment polylactide foil degradation as a result of filamentous fungi activity

84%
Szumigaj J., Zakowska Z., Klimek L., Rosicka-Kaczmarek J., Bartkowiak A.
Polish Journal of Environmental Studies
|
2008
|
tom 17
|
nr 3
355-341
Degree of poly (lactic acid) (PLA) foil degradation by the filamentous fungi i.e. Aspergillus ustus, A. sydowii, A. fumigatus, Paecilomyces lilicanus and Penicillium verrucosum has been investigated. A degradation process has been conducted in dynamic conditions at 30°C for 10 days in a medium containing 0.1% of foil as carbon source. To activate the enzymes involved in the poly (lactic acid) foil degradation, triple passaging on the medium has been conducted. Each passage lasted 10 days. After passages, increase of the mycelium biomass, its enzymatic activity and structural foil changes have been investigated using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). Strain passaging has resulted in the activation of the enzymes of the esterase group responsible for foil degradation, expressing itself in the mycelium biomass increase. Penicillium verrucosum and Aspergillus ustus appeared to be the most active strains. Structural and thermal changes of the material have been demonstrated. Filamentous fungi have a wide range of enzymes of the esterase group which, following initial activation, may actively participate in PLA foil degradation.
9
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Edible coatings - formation, characteristics and use - a review

84%
Kokoszka S., Lenart A.
Polish Journal of Food and Nutrition Sciences
|
2007
|
tom 57
|
nr 4
399-404
The increased consumer demand for food products characterised by high quality and a long shelf-life has initiated the development of mildly preserved products that keep their natural and fresh appearance for the longest possible time. Edible coatings have been long used empirically for food protection and shelf-life prolongation. A growing interest in edible coatings has been observed in the past few years. This paper characterises edible coatings, natural materials/biopolymers used in the production of edible coatings and their application in the food industry.
10

Kinetics of a nucleoside release from lactide-caprolactone and lactide-glycolide polymers in vitro

84%
Kryczka T., Grieb P., Bero M., Kasperczyk J., Dobrzynski P.
Acta Biochimica Polonica
|
2000
|
tom 47
|
nr 1
We assessed the rate of release of a model nucleoside (adenosine, 5%, w/w) from nine different lactide-glycolide or lactide-caprolactone polymers. The polymer discs were eluted every second day with an artificial cerebrospinal fluid at the elution rate roughly approximating the brain extracellular fluid formation rate. Adenosine in eluate samples was assayed by HPLC. Three polymers exhibited a relatively constant release of adenosine for over four weeks, resulting in micromolar concentrations of nucleoside in the eluate. This points to the neccessity of further development of polymers of this types as intracerebral nucleoside delivery systems for local treatment of brain tumors.
11

Environmental aspects of packaging

67%
Zakowska H.
Opakowanie. Special Edition
|
2010
|
nr 1
37-40
12

Impact of poly(L-lactide) versus poly(L-lactide-co-trimethylene carbonate) on biological characteristics of fibroblasts and osteoblasts

67%
Scislowska-Czarnecka A., Pamula E., Kolaczkowska E.
Folia Biologica
|
2013
|
tom 61
|
nr 1-2
13

Biodegradowalne opakowania z polilaktydu [PLA] do owocow i warzyw

34%
Zakowska H.
Przemysł Fermentacyjny i Owocowo-Warzywny
|
2006
|
tom 50
|
nr 07-08
34
From an environmental point of view biodegradable polymers offer an interesting alternative to classical plastics. Example of polymers completely made from renewable resources, are polyesters such as polylactide (PLA). Its properties are especially suitable for food packaging. PLA can be used in a wide range of packaging applications for example fruit and vegetable. The novel polymer is forging roles in thermoformed trays and containers as well as shopping bags and labels. It is convenient to processes on conventional extrusion and thermoforming equipment. PLA is compostable under industrial conditionsall of packaging is certified in according to the standard EN13432:2000 by DIN CERTCO and qualify to use IBAW compostability logo. In additioni, increased efficiencies in the manufacturing process and the rising prices of petrol oil have led to the cost of PIA becoming comparable to other conventional plastic materials.
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