Enhancement of Waterproofing Properties of Finished Upper Leather Produced from Bangladeshi Cow Hides

Shahriar, Abrar; Zohra, Fatema-Tuj; Murad, A.B.M. Wahid; Ahmed, Sobur

doi:10.24018/ejeng.2019.4.7.1426

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…The pH of the raw substrate is relatively low. The acidic nature of chrome-tanned leather results from the use of acidic chrome salts [e.g., a chrome alum pH = 3.5; 20°C/chrome B pH (1:10) may be 1.5–2.5] in the wet blue process and the nature of the raw material ( 35 ).…”

Section: Discussionmentioning

confidence: 99%

Biotransformation of protein-rich waste by Yarrowia lipolytica IPS21 to high-value products—amino acid supernatants

Wieczorek,

Gendaszewska,

Miśkiewicz

et al. 2023

Microbiol Spectr

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The yeast strain Yarrowia lipolytica IPS 21 was tested for its ability to degrade potentially toxic chrome-tanned leather shavings (CTLS) in a liquid environment. Biological and chemical parameters were monitored during a 48-h period of biotransformation of the protein-rich waste. CTLS was added at a concentration of 0.1–4% (wt/wt) to a modified YPG medium (15 g L −1 yeast extract and 5 g L −1 NaCl). Biodegradation and bioconversion were performed in a one-step process. It was found that the higher degradation rate depended on the activity of the proteases and the pH of the medium, but not on the initial inoculum ratio and the activity of the dehydrogenase. The highest efficiency of the process was obtained for 4% (wt/wt) CTLS on day 2 (degradation rate 58–67%, biomass production 2.11–2.20 g L −1 , protease activity 312 U mg −1 protein, and pH 9.20). Our results showed that total chromium was probably not transported across the cytoplasmic membrane of Y. lipolytica IPS21 and that chromium (III) was not oxidized to chromium (VI). The phytotoxicity of selected amino acid supernatants [2.5% (vol/vol)] was tested after the bioconversion process. It was found that the supernatants had a stimulating effect on the plants tested. The root elongation was 29–28% higher than that of the reference samples. This result makes Y. lipolytica IPS21 a potential candidate for safely converting potentially toxic protein-rich wastes into valuable products without enzyme isolation, e.g., amino acid fertilizers. IMPORTANCE Enzyme technologies have the greatest practical relevance to environmental trends. Overcoming the barrier of the high cost of carbon substrates used for biotransformation is the main challenge of these methods. The huge potential of the use of extracellular proteases of Yarrowia species or amino acids in various industries indicates the need for the extension of basic research on waste as a carbon source for this yeast. The experiments demonstrated that it is possible to use Y. lipolytica IPS21 for bioconversion of chrome-tanned leather shavings (CTLS) in a single-step process and to produce high-value amino acid supernatant without having an isolated enzyme. In our study, we show the effect of 2.5% (vol/vol) CTLS supernatant obtained from Y. lipolytica IPS21 on the elongation of the root system of selected plants and provide information on the effect of environmental factors on the efficiency of the bioconversion and the migration of chromium.

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Section: Discussionmentioning

confidence: 99%

Biotransformation of protein-rich waste by Yarrowia lipolytica IPS21 to high-value products—amino acid supernatants

Wieczorek,

Gendaszewska,

Miśkiewicz

et al. 2023

Microbiol Spectr

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“…Sundar and Muralidharan confirmed in their study the possibility of improving the water vapor permeability of leather intended for footwear uppers through appropriate enzymatic and chemical treatments. Experiments have been successfully carried out at Bangladeshi research centers, the purpose of which was to increase the waterproof properties of cowhide leather for footwear uppers by using appropriate agents and modifying the individual steps in the technological processing of leather …”

Section: Introductionmentioning

confidence: 99%

“…Experiments have been successfully carried out at Bangladeshi research centers, the purpose of which was to increase the waterproof properties of cowhide leather for footwear uppers by using appropriate agents and modifying the individual steps in the technological processing of leather. 4 The proposed solutions may also concern imparting such properties into materials that will aid the prevention and treatment of various diseases. An example might be the study by Yalcin, Ata Karavana, Rencber, and Yaprak Karavana 5 in which microcapsules containing chlorhexidine digluconate were used to modify leather intended for vamp and lining for footwear for the diabetics.…”

Section: Introductionmentioning

confidence: 99%

Application of Chromatographic and Microbiological Analyses to Identify and Assess the Durability of Antimicrobial Properties of Innovative Materials for the Footwear Industry─Leather Modified with Origanum vulgare Oil

Bielak

Sawoszczuk

Syguła‐Cholewińska

2023

Ind. Eng. Chem. Res.

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A modification of the leather finishing technology in which the essential oil of Origanum vulgare is applied during the process of fatliquoring imparts antimicrobial activity to leather. This paper presents the characteristics of cowhide lining leather enriched with oregano oil (3% wt ) in terms of durability of the antimicrobial activity conferred to it. Analyses carried out using gas chromatography−mass spectrometry have shown that carvacrol, the main component of oregano oil which is responsible for antiseptic action, constitutes more than 65% of the mixture of organic compounds detected in the vapor phase over samples of leather enriched with the oil even after 72 months of application. The results of an investigation into the kinetics of volatile compounds emission from leather samples treated with oil provided a proof that carvacrol emission decreased over time in an exponential way but did not fade out. This correlates with the results of microbiological analyses conducted using the agar plate diffusion method. The zones of growth inhibition obtained for the strains of microorganisms with sizes of 13 mm (Staphylococcus aureus), 1−3 mm (Candida albicans), and 2 mm (Staphylococcus epidermidis, Scopulariopsis brevicaulis) confirmed that the leather treated with oil still showed good activity against Gram-positive bacteria and fungi after 72 months of storage. The long-lasting antimicrobial properties of leather enriched with a natural biocide� oregano essential oil make it possible to be used in the production of special footwear intended for people with problems of the skin of the feet and toenails caused by pathogenic bacteria and fungi.

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Enhancement of Waterproofing Properties of Finished Upper Leather Produced from Bangladeshi Cow Hides

Cited by 2 publications

References 4 publications

Biotransformation of protein-rich waste by Yarrowia lipolytica IPS21 to high-value products—amino acid supernatants

Biotransformation of protein-rich waste by Yarrowia lipolytica IPS21 to high-value products—amino acid supernatants

Application of Chromatographic and Microbiological Analyses to Identify and Assess the Durability of Antimicrobial Properties of Innovative Materials for the Footwear Industry─Leather Modified with Origanum vulgare Oil

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