Eco-dyeing using Tamarindus indica L. seed coat tannin as a natural mordant for textiles with antibacterial activity

Abstract

Tamarind seed coat tannin was extracted and its tannin class was determined. The extracted tannin was employed as a natural mordant alone and in combination with metal mordant namely copper sulphate for cotton, wool and silk fabrics and dyed using natural dyes namely turmeric and pomegranate rind. The colour strength, colour coordinates, wash and light fastness were evaluated and compared for all the three fabrics with and without mordanting. The pre-mordanted fabrics on dyeing gave better colour strength, wash and light fastness than those dyeing obtained without mordanting. The total phenolic content of the extract was calculated and minimum inhibition concentration was 1% against both the Staphylococcus aureus and Escherichia coli bacteria. The mordanted and dyed fabrics resulted in good antibacterial activity up to 20 washes, when natural mordant was used along with 0.5% and 1% copper sulphate mordant and dyed with natural dyes.

Impacts of Air Pollution on Colour Fading and Physical Properties of Wool Yarns Dyed with Some Natural Dyes in Residential Site

“…Then yarns were dyed for one hour (in case of Cochineal dye) and for 30 minutes (in case of Turmeric and Madder) and the dyed samples were rinsed with cold water and washed for 30 minutes in a bath containing 3 g/L of non-ionic detergent at 45°C. Finally, the yarns were rinsed and air dried [19][20][21].…”

“…Then yarns were dyed for one hour (in case of Cochineal dye) and for 30 minutes (in case of Turmeric and Madder) and the dyed samples were rinsed with cold water and washed for 30 minutes in a bath containing 3 g/L of non-ionic detergent at 45°C. Finally, the yarns were rinsed and air dried [19][20][21].Pre-mordanting of wool yarns: The pre-mordanting method was used in case of dyeing wool yarns with dyes extracted from Cochineal, Turmeric and Madder using alum salt, copper salt, and chromium salt. The mordant was dissolved and added to the bath with liquor ratio 1:50.…”

Generalidades de la seda y su proceso de teñido

“…Por lo anterior, se buscan opciones para reemplazar especialmente los que contienen metales pesados. Se encuentran reportes del uso alternativo de mordientes provenientes de fuentes naturales como: hongos [40] o plantas [41], así como el uso de algunos ácidos orgánicos [8], entre otros.…”

“…Algunos estudios revelan que existe una tendencia en mejorar la retención del color al realizar el proceso de mordentado simultáneo a la tintura [40]. En la figura 3 se esquematiza un procedimiento general para el teñido de seda con colorantes naturales con mordentado.…”

Eco-dyeing of wool with Rubia cordifolia root extract: Assessment of the effect of Acacia catechu as biomordant on color and fastness properties

“…In this regard, researchers searched for a greener substitute from flora and fauna. Consequently, green alternatives have been employed which have high tannin and/or metalhyperaccumulating contents (Prabhu and Teli 2014;Cunningham et al 2011;Vankar et al 2008;Shahid et al, 2012;Vankar and Shanker 2009). Mansour and Heffernan (2011) used Acacia catechu (cutch) as a green substitute to metal salt with impressive results also.…”