Fabrication and characterization of polysulfone and polyethersulfone membranes applied in the treatment of fish skin tanning effluent

Fiorentin-Ferrari, Leila Denise; Celant, Kamila Mayara; Gonçalves, Bruna Cristina; Teixeira, Sarah Mayane; Santana, Veronice Slusarski

doi:10.1016/j.jclepro.2021.126127

Cited by 11 publications

(6 citation statements)

References 37 publications

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“…Prediction of membrane permeability is necessary in the development of pharmaceutical formulations. MTX permeation through an artificial polyethersulfone microporous membrane (0.45 μm) that mimics the skin [ 47 , 48 ] was studied. It was found that the cumulative amount of free MTX released from kCR/MTX gel and passed through the membrane during 6 h was 16 wt.%.…”

Section: Resultsmentioning

confidence: 99%

β-Cyclodextrin Modified Hydrogels of Kappa-Carrageenan for Methotrexate Delivery

Nikitina,

Kochkina,

Arinina

et al. 2023

Pharmaceutics

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This work is aimed at developing a kappa-carrageenan (kCR) gel with increased methotrexate (MTX) content. β-Cyclodextrin (βCD), which is able to inclusion complex formation with MTX, has been used to increase the drug concentration in the hydrogel. The rheological behavior of the designed gels was investigated and the influence of MTX and βCD on the viscoelastic properties of kCR gel was studied in detail. The effect of βCD and its concentration on the MTX-releasing rate from the kCR gels was examined. The properties of kappa- and iota-carrageenans loaded with MTX were compared and the differences observed were explained in terms of different binding affinities of MTX to these polymers. The obtained gels provided desirable viscoelastic properties useful for topical application.

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Section: Resultsmentioning

confidence: 99%

β-Cyclodextrin Modified Hydrogels of Kappa-Carrageenan for Methotrexate Delivery

Nikitina,

Kochkina,

Arinina

et al. 2023

Pharmaceutics

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“…This percentage refers to amount of chromium oxide (tanning agent) attached to collagen fibers. The minimum value of chromium oxide fixed in the semi-finished leather must 3.0%, 31 according to BASF 32 the value of chromium oxide in the leather must above 2.5%. In this way, the three leathers tanned with chromium salts have an adequate amount of chromium salts.…”

Section: Test 2: Tanned Leathers Strengthmentioning

confidence: 99%

“…This analysis indicates the content of oils and greases in the leather. BASF 32 reports that the values must at most between 16 to 18% for leather to used in clothing.…”

Section: Test 2: Tanned Leathers Strengthmentioning

confidence: 99%

“…31 The pH values obtained for three species are much higher than the value reported by Neu et al 31 and Baldi et al 34 This pH variation is due to the lower amount of formic acid added in the variation pH stage, where for tanning with chromium salts this pH should be 3.0, while for vegetable tannin it should be 4.0, so that the tanning agents absorbed by the dermis and subsequently fixed. 32,33 In current study, as the same percentages of chemical products were used during the other stages, and the pH correction was not carried out at the end of the tanning process, in the fixation stage, whose pH should be at 3.5.…”

Section: Test 2: Tanned Leathers Strengthmentioning

confidence: 99%

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Untitled

2024

MOJFPT

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Background: Several species of fish are commercialized in Brazil, among them many have the potential to use the leathers for making clothes, shoes, and others.Objective: This study aimed to carry out physicochemical and mechanical tests, as well as the morphological characterization of leathers from different fish species, Oreochromis niloticus, Arapaima gigas and Cynoscion virescens, as well as directions of the leather specimens and their correlations regarding quality and strength.Main Body: A total of 10 specimens were removed by treatment, in certain thicknesses, taken diagonally, longitudinally, and transversely from leather as a length function of the fish's body, to determine tensile strength and percentage of extraction (stretching) and progressive tearing using an EMIC dynamometer. The skins subjected to tanning process with chromium salts demonstrated thickness ranging 0.89 to 1.04 mm after tanning. The thickness of O. niloticus leather demonstrated significant differences in the regions, whose average value was 0.96 mm. However, when evaluating thickness of the leathers in relation to directions, longitudinal showed the greatest thickness 1.11 mm, transversal and diagonal directions showed no difference between them, whose average was 0.94 mm. The directions of removal of the specimens influenced tensile strength where longitudinal direction 15.12 N mm -2 demonstrated greater strength and diagonal 11.41 N mm -2 less strength. However, the progressive tear test behaved in an inverse way, where longitudinal direction showed lowest 46.79 N mm -1 strength and diagonal 63.89 N mm -1 higher strength. Transversal direction did not differ statistically between the other directions for two parameters evaluated. The traction of O. niloticus leather regions did not influence strength, however, the tearing variable demonstrated lower strength 49.65N mm -1 ) for tail region, while the head and central regions did not show significant difference between regions, whose average was 61.49 N mm -1 . When evaluating tensile strength of the leather, there were no significant differences, where an average value 13.46 N mm -1 was found depending on region, while for the direction of removal of the specimens, the average was 14.49 N mm -1 . The average value for longitudinal and transverse directions independent of the analyzed region was 130.13 and 117.43 N mm -1 , respectively. Tanning with vegetable tannin is recommended for the skins of the three fish studied. Leathers become high quality products, being the raw material for making various artifacts such as clothes and shoes. In addition, it is more environmentally friendly than conventional chemical tanning agents.

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“…Fouling causes a reduction in the selectivity and the permeate flow, and consequently the decrease of the membrane lifespan [9,[40][41][42]49]. Several factors affect the fouling development during filtration, however, the superficial characteristics of the membrane, such as high hydrophilicity and low roughness, can contribute to reducing the deposition of foulants agents [5,40,[44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Membranes and its Applications

Oliveira

2022

Advanced Functional Membranes

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The utilization of sustainable and high-performance technologies is a growing tendency in industrial processes. The membrane separation process is a clean technology alternative that can be used to separate, concentrate, and/or purify substances. But there is still a great interest in turning this process increasingly sustainable by the structural modification of the membranes using biopolymers and green solvents, and the functionalization with organic and inorganic materials, also improving their performance and anti-fouling characteristics. Thus, this review chapter brings the main concepts about membranes and their main structural modifications to obtain a process that meets the concepts involved in Green Technology.

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Fabrication and characterization of polysulfone and polyethersulfone membranes applied in the treatment of fish skin tanning effluent

Cited by 11 publications

References 37 publications

β-Cyclodextrin Modified Hydrogels of Kappa-Carrageenan for Methotrexate Delivery

β-Cyclodextrin Modified Hydrogels of Kappa-Carrageenan for Methotrexate Delivery

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Sustainable Membranes and its Applications

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