Synthesis of biodegradable hydroxyethylcellulose cryogels by UV irradiation

Petrov, Petar; Petrova, Emilia; Tchorbanov, Bozidar; Tsvetanov, Christo B.

doi:10.1016/j.polymer.2007.06.027

Cited by 50 publications

(41 citation statements)

References 26 publications

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“…In the same way the qualitative hydrolysis test of paint was done by Petrova et al, (2007) to determine the ability of the fungus to degrade hydroxyl ethyl cellulose in paint. The antifungal activity was studied with the help of silver ions.…”

Section: Resultsmentioning

confidence: 99%

“…There require low relative humidity for their development and produce spores that can be easily dispersed in air. These conditioned are particularly favourable to fungal growth, the hypha growth on the paints causes exfoliation, side cracking, loss of paints and colored stains ( Petrova et al, 2007). The principle factors affecting the growth of moulds on paint may be, nutrients, moisture, infection and formulation.…”

Section: Introductionmentioning

confidence: 99%

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Biodeterioration of fabric paints by fungal species and their control using antifungal agent

Malathi¹,

Devanathan.²

2017

Int. J. Adv. Res. Biol. Sci

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Paintings are essential components of culture heritage all over the world. Paints consist of organic and inorganic nutrients that can stimulate the growth of the microorganism. Many of the components present in paint are biodegradable. Paint is used for the protection of the substrate materials. The purpose of paint is to provide good appearance. Paint is a surface coating polymer based products. It is often discoloured by mould and blue stain, this leads to loss of paints. Biodeterioration arise from interaction among substrate, environment and organisms. The fungi degrade the paint film by producing extracellular enzymes such as ligninase, cellulose and organic acids. The most commonly used method is the addition of antifungal agent in the paint composition, which may acts as a biocide and inhibits the mould growth on paint and painted surface. Therefore the present study was aimed to isolate and identified the mouldy growth on fabric paints especially in green and red colors. The effective control of fungi in the paints was controlled using appropriate antifungal agent. Silver nitrate is very effective in killing fungal species that causes decay and deterioration of paint or paint film even at low concentration.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biodeterioration of fabric paints by fungal species and their control using antifungal agent

Malathi¹,

Devanathan.²

2017

Int. J. Adv. Res. Biol. Sci

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“…Therefore, under such conditions the probability for recombination of two macroradicals is increased. This fact explains why cellulose derivatives, which degrade in solution upon UV irradiation, were successfully crosslinked via cryogenic treatment [11,12]. Figure 2 shows the storage (G 0 ) and loss (G 00 ) moduli in the 0.1-10 Hz frequency range of 3 mass% aqueous 2-hydroxyethylcellulose (HEC) solutions irradiated with UV light in the frozen state (À30 C) and at room temperature.…”

Section: Cryogels From Water-soluble High Molar Mass Polymersmentioning

confidence: 99%

“…The GF yield increases with C, initial polymer concentration 1 mass%, polymer molar mass 1,300,000 g/mol, 2 mass% BBTMAC, irradiation time 2 min. Reprinted from [12] with permission from Elsevier increasing concentration and reaches a maximum at a polymer concentration of 1 mass% for HECs with molar masses of 1,300,000 g/mol and 300,000 g/mol, and 2 mass% for HEC with molar mass of 90,000 g/mol, and decreases at higher concentrations. In addition, the higher the molar mass of polymers, the higher the GF yield of cryogels.…”

Section: Cryogels From Water-soluble High Molar Mass Polymersmentioning

confidence: 99%

Cryogels via UV Irradiation

Petrov

Tsvetanov

2014

Polymeric Cryogels

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“…In particular, the synthesis of cryogels via UV irradiation appears to be a very fast and effi cient approach which can be set up at low cost (Doycheva et al, 2004;Petrov et al 2006Petrov et al , 2007. This method allows preparation of various biocompatible, biodegradable, and/or thermosensitive supermacroporous cryogels by irradiation of moderately frozen aqueous systems with UV light (irradiation dose rate of 950 J m -2 s -1 ) for 2 -5 minutes in the presence of a photoinitiator.…”

Section: Bn10 Cells Entrapped In Cryogelsmentioning

confidence: 99%

Biosurfactant Production by Pseudomonas aeruginosa BN10 Cells Entrapped in Cryogels

Christova

Petrov

Kabaivanova

2013

Zeitschrift Für Naturforschung C

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Production of a rhamnolipid biosurfactant by cells of Pseudomonas aeruginosa strain BN10 immobilized into poly(ethylene oxide) (PEO) and polyacrylamide (PAAm) cryogels was investigated under semicontinuous shake fl ask conditions and compared to biosurfactant secretion by free cells. The biosurfactant synthesis was followed over 9 cycles of operation of the immobilized system, each cycle comprising 7 days at ambient temperature and neutral pH. Type and quantity of the carrier were optimized for the rhamnolipid production. The highest rhamnolipid yield of 4.6 g l-1 was obtained in the 6th cycle for the immobilized system with 3 g PEO compared to 4.2 g l-1 obtained for the free cells, thus immobilization provided physiological stability of the cells. Scanning electron microscopy revealed preservation of the cell shape and regular distribution of the cells under the matrix surface. The polymer matrices possessed chemical and biological stability and very good physico-mechanical characteristics which are a prerequisite for a high life span of these materials for the production of rhamnolipids

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Synthesis of biodegradable hydroxyethylcellulose cryogels by UV irradiation

Cited by 50 publications

References 26 publications

Biodeterioration of fabric paints by fungal species and their control using antifungal agent

Biodeterioration of fabric paints by fungal species and their control using antifungal agent

Cryogels via UV Irradiation

Biosurfactant Production by Pseudomonas aeruginosa BN10 Cells Entrapped in Cryogels

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