Potential of water hyacinth leaves extract as a leather tanning agent / Fitsum Etefa Ahmed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 9 (09/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 9 (09/2022) . - p. 391-399 Titre : Potential of water hyacinth leaves extract as a leather tanning agent Type de document : texte imprimé Auteurs : Fitsum Etefa Ahmed, Auteur ; Gemeda Gebino Gelebo, Auteur ; Belay Meles Gebre, Auteur Année de publication : 2022 Article en page(s) : p. 391-399 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie végétale Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés physiques Extraits de plantes Jacinthe d'eau et constituants La jacinthe d'eau ou camalote (Eichhornia crassipes) est une espèce de plantes monocotylédones de la famille des Pontederiaceae, originaire d'Amérique du Sud. Ce sont des plantes aquatiques des rivières, canaux et lacs des régions tropicales. On pense que la jacinthe d'eau provient de la cuvette amazonienne et des grands lacs et marais de la région du Pantanal dans l'ouest du Brésil. L'espèce fait partie des 100 pires espèces envahissantes selon l'UICN. Tanins végétaux Tannage végétal Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Potential of Water Hyacinth Leaves Extract as a Leather Tanning Agent Water hyacinth (Eichhornia crassipes) is listed as one of the worst aquatic plants in the world and its presence in Lake Tana in Ethiopia has been recognized since 2011. Currently, the plant coverage in the lake is increasing and very limited studies have been conducted in the country on practical application of water hyacinth. The aim of this study was to determine the phytochemicals, functional groups and Tannin content of the water hyacinth plant found in the Lake, which could serve as a vegetable tanning agent. Both qualitative and quantitative approaches were used to assess the quality tannin in the plant stem and leaves. On phytochemical analysis of the dried material, the tannin content was found to be 4.1% for leaves and 2.7% for stem parts. As the tannin content of the leaves was higher than the stem parts, leather tanning conducted using the 10% wt and 20% wt leaves and the quality of tanned leathers was evaluated and compared with the leather made from quebracho vegetable tanning material as a control. Most properties of leathers tanned using the leaves met the minimum specified standards for leather product manufacturing, which includes tearing strength > 45 N, percent elongation at break > 42% distension at grain crack > 6.5 mm, and distension at burst >7.8 mm. Even though shrinkage temperature is one of the most important parameters in determining the thermal stability of leather, the leather tanned with leaves extract had a shrinkage temperature of 52°C, which is lower than the standard limit (75°C) for leather product manufacturing. This indicated that, the crosslinking reaction between the hide (collagen fibers) and tannins (leaves) was weaker, implying that the leather would not be as durable or of higher quality. Similarly, the maximum tensile strength of tanned leather was 7.2 N/mm2, which is lower than the standard requirement (20 N/mm2) for leather product manufacturing. Therefore, water hyacinth leaves extract has limited potential as a vegetable tanning agent, and the tanned leather will not be used to make leather products that requires good thermal resistance and strength. On the other hand, the tanned leather may be utilized for leather products that need minimal tensile strain and thermal property requirements such as leather photo frames, sketchbook leather bound, etc. Since water hyacinth tannin is less than ideal as a tanning agent due the minimum shrinkage temperature and tensile strength of the tanned leather, the potential of the plant as a retanning agent should be studied in future. Note de contenu : - INTRODUCTION : Water hyacinth infestation in lake Tana, Ethiopia - METHODOLOGY : Methods - Plant collection and drying - Percentage yield of dried water hyacinth plant leaves and stems parts - Plant powder preparation - Extract preparation - Phytochemical tests - Beam house operations - Vegetable tanning operations - RESULTS AND DISCUSSION : Flavonoids detection - Saponins detection - Phenols detection - Tannin detection - Alkaloids detection - Starch detection - Protein detection - Tannin and tannin content determination by hide powder method - Physical characteristics of vegetable tanned leather - Tearing strength - Shrinkage temperature - Grain crack and grain burst - Tensile strength - Elongation analysis - Thickness (mm) - Table 1 : Beam house operations recipe and procedure - Table 2 : Vegetable tanning operations recipe and procedure - Table 3 : Phytochemical analysis of water hyacinth leaves and stems parts - Table 4 : Tannins content found in the water hyacinth plant's leaves and stems - Table 5 : Physical test results of vegetable tanned leather DOI : https://doi.org/10.34314/jalca.v117i9.6169 En ligne : https://drive.google.com/file/d/1ni2fOXS2WI1btMYHj2_J70BsoOcJ-JeH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38078 [article]

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