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Auteur Kalarical Janardhanan Sreeram
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Council of Scientific and Industrial Research - Central Leather Research Institute, Chemical Laboratory - Adyar - Chennai - India
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Reuse of solid waste from juice industry (citrus sinensis peel) in the extraction of antioxidants with enhanced activity through polymer encapsulates for the preservation of skin / Marimuthu Pradeep Kumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 7 (07/2014)
[article]
Titre : Reuse of solid waste from juice industry (citrus sinensis peel) in the extraction of antioxidants with enhanced activity through polymer encapsulates for the preservation of skin Type de document : texte imprimé Auteurs : Marimuthu Pradeep Kumar, Auteur ; Punitha Velmurugan, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2014 Article en page(s) : p. 231-238 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alginate de sodium L'alginate de sodium ou polymannuronate sodique, de formule NaC6H7O6 est un additif alimentaire (E401) utilisé dans les boissons, constitué d’alginate et de sodium. Il se présente sous forme de poudre blanche à blanc crème, inodore et sans saveur, très soluble dans l'eau. C'est une longue molécule extraite d'algues brunes, constituée d'unités de glucides reliées ensemble pour former une chaîne.
Antioxydants
Biomolécules actives
Cuirs et peaux -- Conservation
Cuirs et peaux de chèvres
Déchets végétaux -- Recyclage
Encapsulation
Inhibiteurs (chimie)
Polyéthylène glycolIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bio resources are finding increasing applications in our day-to-day activities. Current research on the active ingredients of plant/fruit extracts has several applications. To widen their applications in various fields, suitable biocompatible carriers are needed which would increase the shelf life of the extracts. In this work, one such biocompatible carrier for encapsulation has been developed using PEG-Sodium alginate as a complex which will act as a model for any natural product extract viz., Citrus sinensis peel. The extract has been studied for its radical and nitrite scavenging activity, inhibition of ?-carotene bleaching and lipid peroxidation assay, before and after encapsulation in order to quantify the antioxidant activity in presence of the carrier. From the experimental results, better encapsulation of the antioxidant have been observed with increasing molecular weight of PEG, up to 8000 Da which led to an increased shelf life and sustained release. Antioxidant-PEG-8000-SA, 20:2:1 (APS-8000) mixture has been optimized and used for preservation of goatskin. The dehydration, rehydration and hydroxyproline assays reveal that, APS-8000 would be better alternative for the conventional sodium chloride preservation. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of lyophilized powder - Reduced viscosity measurement studies - Color measurement - 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity - Inhibition of -carotene bleaching En ligne : https://drive.google.com/file/d/17Ft9J0k06X8bV8EAfVid0SdylYX58n7J/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21708
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 7 (07/2014) . - p. 231-238[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16423 - Périodique Bibliothèque principale Documentaires Disponible Root cause analysis of color migration in footwear : A case study / Sujata Mandal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 4 (04/2023)
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Titre : Root cause analysis of color migration in footwear : A case study Type de document : texte imprimé Auteurs : Sujata Mandal, Auteur ; Ravi Banothu, Auteur ; R. Mohan, Auteur ; Kalarical Janardhanan Sreeram, Auteur Année de publication : 2023 Article en page(s) : p. 150-155 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs en phase solvant
Caractérisation
Chaussures
Cuir teint
Décoloration
Défauts
Essais (technologie)
Frottements (mécanique)
Produits chimiques -- Migration
Solidité de la couleur
Tige de la chaussureIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The phenomena of migration and/or bleeding of colorants are one of the major concerns for the footwear and leather goods industries. The migration/bleeding of the colorants from one component to the other has been observed in many cases that spoil the aesthetics of the product, which in turn leads to economic loss for the industries. In this research article, a typical case of color migration in leather footwear has been studied in depth for root-cause analysis of the migration problem. The leather used in the shoe upper (affected due to migration), the lining fabric, and the adhesive used in making the footwear were characterized by microscopic and spectroscopic techniques. The FTIR-ATR study revealed that the leather was finished with polyurethane-based coating, the lining fabric used was an aromatic polyester and the adhesive was natural rubber-based adhesive. Though the lining fabric was colorfast to rubbing, it released color in all the organic solvents generally used in natural rubber-based adhesive. Migration studies showed that migration of the colorant (black) from the lining material to the leather (white) happened only in the presence of the adhesive. In conclusion, the organic solvent present in the adhesive used in making the footwear was responsible for the color migration from the lining material to the attached leather. Finally, recommendations have also been made to avoid such problems of color migration in products made from a variety of multiple fabrics. Note de contenu : - EXPERIMENTAL : Materials - Characterization techniques
- RESULTS AND DISCUSSION : Microscopic and FTIR-ATR study - Color fastness to rubbing of the lining fabric - Color migration/bleeding tests of the lining fabric
- Table 1 : Values of grey cale rating for the lining and the standard cotton lawnDOI : https://doi.org/10.34314/jalca.v118i4.7205 En ligne : https://drive.google.com/file/d/1GNsWjuOMrNz-6bJkjGVZddPuLqDdKG9f/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39183
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 4 (04/2023) . - p. 150-155[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24030 - Périodique Bibliothèque principale Documentaires Disponible Stimuli responsive leathers using smart retanning agents / Sangeetha Subramanian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 6 (06/2012)
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Titre : Stimuli responsive leathers using smart retanning agents Type de document : texte imprimé Auteurs : Sangeetha Subramanian, Auteur ; N. N. Fathima, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2012 Article en page(s) : p. 196-204 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Cuir
Formaldéhyde
Fourier, Spectroscopie infrarouge à transformée de
Matériaux intelligents
Matériaux thermosensibles
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Microscopie électronique à balayage
Naphtalène
Retannage
Syntans
Thermogravimétrie
Transition de phaseEn physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...).
Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The main use of leather is to protect the body against external environment and to provide comfort. However, leather may be used for additional functions specific to 1) an adverse or extreme climate and 2) job-ambience or profession so as to enhance adaptability and productivity of the user. When such an application arises, the leather is termed as “smart material”. Making leather perform the functions it did as a skin on a live animal renders it as smart leather. Hence, the futuristic objective is to make the processed skin termed “leather” retain its memory so as to result in “smart or intelligent leather”. In this paper, it has been attempted to incorporate thermo responsive function into leathers using smart materials such as phase changing materials (PCM). PCMs are capable of absorbing or releasing large amount of heat during phase transitions between two solid states and/or liquid and solid states. Manufacture of syntans using PCM based on two different prepolymers viz, melamine formaldehyde and naphthalene sulfonic acid has been attempted in this paper. The retanning agents synthesized have been characterized using various techniques like FT-IR, DSC, TGA and SEM analysis. Leathers made using PCM incorporated retanning agents have been tested for various properties viz. strength properties, thermal stability, organoleptic properties to study the influence of the PCM incorporated retanning agents. Note de contenu : - REAGENTS
MICROENCAPSULATION OF n-OCTADECANE : Synthesis of prepolymer solution - Synthesis of oil phase - Synthesis of water phase - Emulsion preparation - Fabrication of microcapsules (PCM))
- CHARACTERIZATION OF SMART RETANNING AGENTS : FT-IR analysis - Differential scanning calorimetry - Thermo-gravimetric analysis - Scanning electron microscopy
- RETANNING AND CHARACTERIZATION OF LEATHERS MADE USING SMART RETANNING AGENTS
- CHARACTERIZATION OF RETANNING AGENTS MADE USING PCM FTIR ANALYSIS : Scanning Electron Microscopy analysis - Thermo Responsive Function Analysis
- PROPERTIES OF LEATHER MADE USING PCM : Thermal Stability (DSC and TGA) of leathers - Scanning Electron Microscopic Studies of Leathers - Physical strength characteristics of leathers - Hand evaluation of leathers - Thermo responsive functionEn ligne : https://drive.google.com/file/d/1q8RiPFy-qGqifrMclOhTAMfwDOMHfayT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15533
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 6 (06/2012) . - p. 196-204[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13991 - Périodique Bibliothèque principale Documentaires Disponible Studies on the development of a multi-functional syntan / R. Nataraj in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 7 (07/2009)
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Titre : Studies on the development of a multi-functional syntan Type de document : texte imprimé Auteurs : R. Nataraj, Auteur ; Rathinam Aravindhan, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2009 Article en page(s) : p. 251-260 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Innovations in recent years brought radical changes in leather processing. A trend has been set for bioprocessing in place of chemical processing. Enzymatic dehairing, lime free fiber opening, pH static and transposed processes have been developed to reduce pollution loads, essentially from pre-tanning operations. The demand for eco-labeled leather and leather products is gaining importance in the global leather industry. This ha forced the chemical manufactures to look for suitable alternative chemistry for preparation of syntans. Post-tanning operations, primarily the retanning process, employ mostly phenol and formaldehyde based agents to obtain fullness. Further, the post tanning operations use a combination of syntans to achieve the desired grain tightness, fullness and roundness. Many of these chemical are slow biodegradable and hence affect the environment significantly. A need has been sensed to develop products for retanning, which are devoid of phenols, formaldehyde and neutral salts. This work reports the development and use of a multifunctional syntan ; a product developed from solid wastes and biodegradable natural materials as an alternative to conventional phenol-formaldehyde based products in retanning for upper leathers. Physico-chemical analysis, morphological studies and emission loads have been compared. The product provides a synergistic effect on the leather as compared to the unifunctional properties offered by conventional phenol-formaldehyde syntans. En ligne : https://drive.google.com/file/d/1KxapuTN8cgIc8a6Y7G2ghmcwQSur3fBE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5984
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Code-barres Cote Support Localisation Section Disponibilité 011463 - Périodique Bibliothèque principale Documentaires Disponible Tanning studies with basic chromium sulfate prepared using chrome shavings as a reductant : A call for 'wealth from waste' approach to the tanning industry / Jonnalagadda Raghava Rao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 4 (04/2004)
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Titre : Tanning studies with basic chromium sulfate prepared using chrome shavings as a reductant : A call for 'wealth from waste' approach to the tanning industry Type de document : texte imprimé Auteurs : Jonnalagadda Raghava Rao, Auteur ; Palanisamy Thanikaivelan, Auteur ; Balachandran Unni Nair, Auteur ; Kalarical Janardhanan Sreeram, Auteur Année de publication : 2004 Article en page(s) : p. 170-176 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Leather processing is associated with the generation of both solid and liquid wastes. Various in plant as well as end-of-pipe treatment methodologies are available for the management of liquid wastes. Although several options do exist for handling solid wastes, the presence of chromium causes concern for many of the applications. Chrome shavings contribute to almost 10% of the solid wastes generated from processing raw hides/skins. In this study, chrome shavings have been advantageously used as a reductant for the manufacture of basic chromium sulfate thereby providing a comprehensive closed cycle. Two BCS products developed with chrome shavings alone for reduction (complete replacement of molasses, product A) or partial replacement of molasses (product B) have been employed for tanning of goatskins. Studies reveal that the quality of the wet blue leathers is on par with the leathers tanned with commercial BCS. Shrinkage temperature of the leathers is comparable and is above 100°C at an offer of 1.25% Cr2O3. Chromium exhaustion is in the range of 75 - 80% with 1318 -1490 ppm of chromium in the spent tan liquor. Wet blue leathers tanned with product A possess more fullness among all the leathers, which may be due to the presence of intermediate protein products formed during BCS preparation. This is further confirmed with the scanning electron microscopic analysis. Performance of the crust leathers is comparable to that of conventional tanned leathers in spite of reduction in syntans by 20%. This methodology provides a means for recovering wealth from waste. En ligne : https://drive.google.com/file/d/1_zQqLuBfXl2GkITE1bUD8wEPCMdErPzj/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4191
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Code-barres Cote Support Localisation Section Disponibilité 001600 - Périodique Bibliothèque principale Documentaires Disponible 001601 - Périodique Bibliothèque principale Documentaires Disponible The three pot solution for chromium, tannins and solid waste : Recovery and reuse technique for spent semi-chrome liquor and chrome shavings / Subramanian Saravanabhavan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 5 (09-10/2004)
PermalinkThermochromism for smart leathers / Vairaperumal Tamilmani in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 6 (06/2015)
PermalinkTowards sustainable leather production vegetable tanning in non-aqueous medium / Narayana Reddy Gari in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 4 (04/2015)
PermalinkUse of ternary solvent (water - ethanol - ethyl acetate) medium for leather processing : a possible paradigm change / Bhargavi Narayana Reddy Gari in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 7 (07/2016)
PermalinkValue added leather auxiliaries from paper and pulp industry waste / Mohan Vedhanayagam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 9 (09/2015)
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