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  • 1
    Electronic Resource
    Electronic Resource
    Macroporous styrene-divinylbenzene copolymers as carriers for poly(vinylamine)-cobaltphthalocyanine oxidation catalysts (1980)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 89 (1980), S. 201-219 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Makroporöse hochvernetzte Copolymere aus Styrol (St) und Divinylbenzol (DVB) wurden durch Lösungs- und Perlpolymerisation hergestellt. Die dargestellten Träger ermöglichten die Pfropfung von Poly(N-vinyl-tert-butylcarbamat) (PVCa) entweder durch Addition von VCa-Makroradikalen an die am unlöslichen Träger anhängenden Doppelbindungen oder durch Termination von VCa-Makroradikalen mit Radikalen, die sich an der Trägeroberfläche befinden. Poly(vinylamin) (PVAm) gepfropft auf St-DVB Träger wurde durch Hydrolyse von gepfropftem PVCa mit HCl und nachfolgende Entfernung von amingebundenem HCl mittels NaOH erhalten. Heterogene bifunktionelle Katalysatoren wurden dargestellt durch Bindung von Kobalt(II) 4,4′,4″,4‴-tetracarboxyphthalocyanin (CoPc(COOH)4) an gepfropftes PVAm. Die hergestellten Katalysatoren wurden zur Oxidation von Thiolen zu Disulfiden, sowohl in vorwiegend apolaren a l s auch in wäßrigen Lösungsmitteln verwendet. Es wurde bewiesen, daß eine große innere Oberfläe, ein hinreichend grolßer mittlerer Porendurchmesser und Zugänglichkeit der anhlngenden Doppelbindungen wichtige Voraussetzungen sind für die Anwendbarkeit vom makroporösen St-DVB Copolymeren als Träger für den PVAm-CoPc(COOH)4 Katalysator.
    Notes: Macroporous highly crosslinked styrene(St)-divinylbenzene(DVB) copolymers were prepared by solution and suspension polymerization techniques. The obtained materials allowed the grafting of poly(N-vinyl-tert-butylcarbamate) (PVCa) either by addition of VCa macroradicals to the solid bound double bonds or by termination involving the reaction of VCa macroradicals with radicals present on the carrier. Poly(vinylamine) (PVAm) grafted on St-DVB carriers was obtained after the hydrolysis of grafted PVCa with HCl and the subsequent removal of the aminebonded HCl by means of NaOH. Heterogeneous bifunctional catalysts were obtained by attachment of cobalt(II) 4,4′,4″,4‴-tetracarboxyphthalocyanine (CoPc(COOH)4) to the grafted PVAm. The prepared catalysts were applied to the autoxidation of thiols to disulfides, both in predominantly apolar media and in aqueous media. It was demonstrated, that important prerequisites for the applicability of macroporous St-DVB copolymers as carriers for the PVAm-CoPc(COOH)4 catalyst include a high surface area, a sufficiently large average pore diameter and accessibility of the pendent double bonds.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1980.050890117
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  • 2
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    Effect of using various amounts of patin (Pangasianodon hypophthalmus) fish oil on physical and chemical properties of moisturizing hand cream (2021)
    In:  http://aquaticcommons.org/id/eprint/26457 | 18721 | 2019-05-06 09:22:48 | 26457 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-24
    Description: Hand cream is used for rehydrating and improving skin properties. The skin is the first point of contact with the environment. Thus having healthy skin with proper barrier properties is quite important. The beneficial effects of fish oil on skin make it a favorable ingredient to be used in hand care products. In the present study, the efficacy and stability of various hand cream formulations using 0, 1.0, 2.5 and 5.0% of fish oil were investigated and compared. The appearance, odor, texture, and pH of formulations containing 1 and 2.5% of fish oil remained stable in very good qualities during the storage, whereas the related values to the appearance and texture of formulation containing 5.0% of fish oil at the end of 6 months of storage at 45°C were significantly (p〈0.05) lower than other formulations and previous evaluations of this formulation. Weight loss was not observed in all formulations under study.
    Keywords: Biology ; Chemistry ; Fisheries ; Fish oil ; Hand cream ; Formulation ; Cosmetic ; Stability ; Malaysia
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 215-223
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  • 3
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    Refined oil production from patin catfish (Pangasianodon hypophthalmus) by-products (2021)
    In:  http://aquaticcommons.org/id/eprint/22789 | 18721 | 2018-05-22 19:21:46 | 22789 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: In this study, oil was extracted from the liver and visceral fat of Patin (Pangasianodon hypophthalmus) and refined. The yield of oil after refining was 49.98%. The major yield loss (34.20%) happened during the degumming procedure. Fatty acids found in the crude and refined oil were C12:0, C14:0, C14:1, C16:0, C16:1, C18:0, C18:1, C18:2, C18:3, C18:4, C20:0, C20:1, C20:4, C20:5, and C22:6. The dominant saturated, monounsaturated and polyunsaturated fatty acids were C16:0, C18:1 n-9, and C18:2 n-6, respectively. The total amounts of monounsaturated fatty acids did not change significantly during refining procedure (p〉0.05), whereas the total amount of saturated and polyunsaturated fatty acids changed significantly (p〈0.05). The n-3 to n-6 ratios of crude, degummed, neutralized, bleached, and deodorized oils were 1.11, 1.06, 1.05, 1.02, and 1.01, respectively.
    Keywords: Chemistry ; Fisheries ; Byproduct ; Fish oil refining ; Fatty acid composition ; n-3 fatty acids ; Fish processing ; Malaysia
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 457-466
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