Biotechnological Processes for Recycling of Rubber Products

Bredberg, Katarina; Christiansson, Magdalena; Stenberg, Bengt; Holst, Olle

doi:10.1002/3527600035.bpol2011

Cited by 4 publications

(5 citation statements)

References 28 publications

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“…In recent years, raw materials and agro-industrial wastes origin have been proposed as low-cost alternative carbohydrate sources. On this regard, chicken feathers and sweet potato have been introduced as nitrogen and carbon sources [ 113 ], respectively to produce carotenoid, and also minimizing environmental and energetic problems related to their disposal [ 114 ]. Many investigations have been performed to diminish the costs and optimize the carotenoid production; and factors such as carbon and nitrogen source are very important to consider on the selection of agro-industrial waste as substrates [ 115 ].…”

Section: Introductionmentioning

confidence: 99%

Biotechnological production of carotenoids by yeasts: an overview

et al. 2014

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Nowadays, carotenoids are valuable molecules in different industries such as chemical, pharmaceutical, poultry, food and cosmetics. These pigments not only can act as vitamin A precursors, but also they have coloring and antioxidant properties, which have attracted the attention of the industries and researchers. The carotenoid production through chemical synthesis or extraction from plants is limited by low yields that results in high production costs. This leads to research of microbial production of carotenoids, as an alternative that has shown better yields than other aforementioned. In addition, the microbial production of carotenoids could be a better option about costs, looking for alternatives like the use of low-cost substrates as agro-industrials wastes. Yeasts have demonstrated to be carotenoid producer showing an important growing capacity in several agro-industrial wastes producing high levels of carotenoids. Agro-industrial wastes provide carbon and nitrogen source necessary, and others elements to carry out the microbial metabolism diminishing the production costs and avoiding pollution from these agro-industrial wastes to the environmental. Herein, we discuss the general and applied concepts regarding yeasts carotenoid production and the factors influencing carotenogenesis using agro-industrial wastes as low-cost substrates.

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Section: Introductionmentioning

confidence: 99%

Biotechnological production of carotenoids by yeasts: an overview

et al. 2014

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“…DD/MAS Solid State 13 C NMR. 13 C NMR signals at 44.8, 58.1, 51.0, and 64.5 ppm were assigned as cis-mono, transmono, cis-poly, and trans-polysulfide bonds of polyisoprene according to a reference 17 (Figure 7). In the original rubber, the monosulfide structure constitutes 79.4% of all sulfurcarbon bonds.…”

Section: Resultsmentioning

confidence: 99%

“…Dipolar Decoupling (DD)/ Magic Angle Spinning (MAS) Solid State 13 C Nuclear Magnetic Resonance (NMR) Spectroscopy. Samples of rubber incubated for 250 days in the medium with and without inoculation by fungi were analyzed by solid state 13 C NMR. Quantitative 13 C NMR spectra were recorded on a Bruker CMX 300 NMR spectrometer with a DD/ MAS probe at a carbon frequency of 75.5 MHz, scanning time of 32000, spinning rate of 3.5 kHz, and a recycled delay of 7 s.…”

Section: Fungal Treatments Ofmentioning

confidence: 99%

“…Bredberg and coworkers reported that a lignin-degrading wood rotting fungus, Resinicium bicolor, removed the toxic agents from waste rubber materials, thereby enabling the growth of a desulfurizing-bacterium, Thiobacillus ferooxidans. 13 They reported the potential of wood rotting basidiomycetes for the detoxification of rubber prior to bacterial treatment. However, to our knowledge, there is no report of rubber-degrading basidiomycetes.…”

Section: Introductionmentioning

confidence: 99%

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Microbial Scission of Sulfide Linkages in Vulcanized Natural Rubber by a White Rot Basidiomycete, Ceriporiopsis subvermispora

et al. 2004

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A white rot basidiomycete, Ceriporiopsis subvermispora, degraded vulcanized natural rubber (NR) sheets on a wood medium. The fungus decreased the total sulfur content of the rubber by 29% in 200 days, accompanied by the cleavage of sulfide bonds between polyisoprene chains. X-ray photoelectron spectroscopy (XPS) demonstrated that C. subvermispora reduced the frequency of S-C bonds by 69% with a concomitant formation of S-O bonds during the culture period. Dipolar decoupling/magic angle spinning (DD/MAS) solid state 13C NMR revealed that the fungus preferentially decomposed monosulfide bonds linked to a cis- and trans-1,4-isoprene backbone but the cleavage of polysulfide bonds was also observed. In contrast, no decrease in weight or devulcanization of rubber was observed in cultures of a white rot fungus, Dichomitus squalens. The oxidative cleavage of sulfide bonds by C. subvermispora demonstrates that ligninolytic basidiomycetes are potential microbes for the biological devulcanization of rubber products.

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“…Over the past few years, many agroindustrial wastes and raw components have been studied (shown in Table 6) , and carbohydrate sources available at a low cost have been insinuated. For example, sweet potato and chicken feathers, both as nitrogen and carbon sources, have been introduced to produce carotenoid 89 and minimize energetic and environmental problems associated with their disposal 90 . Many researchers have worked to minimize the price and optimize the production of carotenoids and studied factors such as nitrogen and carbon sources that perform a vital role in the selection of substrates as agroindustrial waste 91 …”

Section: Factors Influencing the Production Of β‐Carotene During Ferm...mentioning

confidence: 99%

β‐Carotene—production methods, biosynthesis from Phaffia rhodozyma, factors affecting its production during fermentation, pharmacological properties: A review

Mujeeb

Nashvia

Prasad

et al. 2022

Biotech and App Biochem

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β-Carotene is the most treasured provitamin A carotenoid molecule exhibiting antioxidant and coloring properties and significant applications in the food, pharmaceutical, and nutraceutical industries. β-Carotene has many biological functions within the human body; however, it is not synthesized within the human body, so its requirements are fulfilled through food and pharmaceuticals. Its manufacturing via chemical synthesis or extraction from plants offers low yields with excessive manufacturing expenses, which attracted the researchers toward microbial production of β-carotene. This alternative provides higher yield and low expenses and thus is more economical. Phaffia rhodozyma is a basidiomycetous yeast that is utilized to prevent cardiovascular diseases and cancer and to enhance immunity and antiaging in people. This paper reviews the methods of production of β-carotene, biosynthesis of β-carotene fromP. rhodozyma, factors affecting β-carotene production during fermentation, and pharmacological properties of β-carotene.

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Biotechnological Processes for Recycling of Rubber Products

Abstract: Introduction Grinding of Rubber Material Recycling of Rubber Material Biotechnological Processes Historical Outline Rubber Products to which Biotechnological Recycling is Applied Microbial Degradation of Rubber Surface Modification … Show more

Cited by 4 publications

References 28 publications

Biotechnological production of carotenoids by yeasts: an overview

Biotechnological production of carotenoids by yeasts: an overview

Microbial Scission of Sulfide Linkages in Vulcanized Natural Rubber by a White Rot Basidiomycete, Ceriporiopsis subvermispora

β‐Carotene—production methods, biosynthesis from Phaffia rhodozyma, factors affecting its production during fermentation, pharmacological properties: A review

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