Comparison of the effect of metal mordants and bio‐mordants on the colorimetric and antibacterial properties of natural dyes on cotton fabric

Abstract

The main objective of this study was to evaluate the effect of bio‐mordants versus metal mordants in terms of colour measurement, colour fastness, and antibacterial properties of a natural dye extract (Hibiscus sabdariffa L.) on the cotton fabric. Accordingly, some bio‐mordants including tannic acid, pine cone, lemon peel, and sodium alginate, as well as some metal mordants such as iron(II) sulphate, copper sulphate, zinc sulphate, and aluminium potassium sulphate were investigated based on three conventional mordanting procedures (pre‐, meta‐ and after‐mordanting). The method appropriate for H. sabdariffa dyeing on the cotton fabric, according to the colour fastness factor, was found to be the after‐mordanting method. The bio‐mordants used in this study, the same as metal salts, increased the colour fastness on the dyed cotton fabrics and produced excellent light fastness (rating of 5 to 6), wash fastness (rating of 4 to 5), and dry/wet rub fastness (rating of 4 to 5). The higher antibacterial activities (> 90% bacterial reduction) against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa were observed when tannic acid, pine cone, and lemon peel were applied to the dyed cotton fabric. The use of bio‐mordants in the natural dyeing of the cotton fabric could be, therefore, recommended due to the biocompatibility and non‐toxicity of natural mordants, along with excellent colour fastness and appropriate antibacterial properties.

Impact of MW rays on extraction and application of Ficus religiosa bark based natural colourant for cotton dyeing

“…Now plant-based extracts have been considered this is because these extracts have ability to develop new colour fast shades but also to transfer their biological characteristics onto fabrics which are beneficial for global village. 41 In this study acacia, pomegranate have been utilised as a source of bio-mordants the result displayed in Figure 6(a) show that utilisation of extract taken 3.0 g/100 mL of acacia before dyeing (pre) has given colour strength (K/S = 7.3095) and the extract taken from 4.0 g/100 mL of acacia after dyeing (post) has given good yield (K/S = 2.3355). The colour coordinates presented in Table 4 so that pre mordanting has given darker shade ( L * = 48.42) with reddish yellow hue ( a * = 11.61; b * = 21.97).…”

Eco‐friendly dyeing of cotton using waste‐derived natural dyes and mordants

“…The natural mordant used contained tannins. The presence of hydroxyl and carbonyl groups in tannins is responsible for forming a large number of hydrogen bonds with cotton fabric and also showed van der Waals forces with fabric, thus improving the colour strength of the fabric 30 …”

Applications of Natural Violet Pigments from Halophilic Chromobacterium violaceum PDF23 for Textile Dyeing with Antimicrobial and Antioxidant Potentials

“…Radiation technique is gaining prominence in the fabric industry, particularly in dyeing process, because of its technical and economical efficiency, as well as its acceptability [31,32]. The low color intensity derived from natural dyes has led to the use of advanced approaches such as irradiation techniques in the fabric industries to overcome this constraint [12,33].…”