Environmental friendly bio-dyeing of silk using Alkanna tinctoria based Alkannin natural dye

Application of bio-dyes, especially plant-based, is becoming increasingly popular in many industries such as textiles, food and pharmaceuticals. This trend could be explained by the ecological and durable nature of these compounds. The current paper aimed to investigate the microwave-assisted isolation of Alkannin dye from Alkanna tinctoria followed by the dyeing of bio-mordanted silk. For the purpose, acid solubilized, water solubilized, and acid-methanol solubilized extracts were obtained. Both respective extracts and silk fabrics were microwave irradiated for 2, 4 and 6 min. To ensure a green and clean dyeing process, bio-mordants were used. It is observed that acid solubilized extract applied at 55 degrees C for 55 min having 7 g/100 mL of NaCl salt as the exhausting agent has given extraordinary higher color strength (K/S) onto Microwave treatment (MW) treated silk fabric. Colorfastness tests using ISO-recommended requirements found that bio-mordants outperformed chemical mordants in terms of color depth and fastness. According to this study, it was proven that MW improved the dyeing performance of Alkannin in an acid-solubilized medium, where as in addition to the application of bio-mordants in comparison with sustainable chemical mordants have improved color characteristics of silk fabric dyed with Alkanna tinctoria extract.

Automated summary

This study investigated the microwave-assisted isolation of Alkannin dye from Alkanna tinctoria and its application in dyeing bio-mordanted silk. Different extracts and microwave treatment times were used to observe the dyeing effects. The use of bio-mordants ensured an eco-friendly and clean dyeing process. The acid solubilized extract showed higher color strength under specific conditions. Colorfastness tests indicated that bio-mordants outperformed chemical mordants in terms of color depth and fastness. The study demonstrated that microwave-assisted dyeing improved the dyeing performance, and the use of bio-mordants enhanced the color characteristics of silk fabric dyed with Alkanna tinctoria extract.