# Extraction Components and Dyeing Effect of Cotinus coggygria Scop. in Water–Ethanol Systems

## TL;DR

This study explores how to extract and use plant pigments from Cotinus coggygria Scop. in an eco-friendly way for dyeing cotton.

## Contribution

The study introduces a sustainable water–ethanol extraction method for CCS pigments with antibacterial properties.

## Key findings

- Water is better for extracting flavonoid glycosides and proanthocyanidins from CCS.
- Ethanol is more effective for extracting flavonols and flavonol glycosides.
- Dyed cotton samples showed significant antibacterial activity against Staphylococcus aureus.

## Abstract

As a highly representative traditional plant dye, the pigment composition of Cotinus coggygria Scop. (CCS) and its dyeing mechanisms require further study. In this work, pigments were extracted from the trunk of CCS using environmentally friendly solvents, namely ethanol and water. A systematic analysis of the components in the CCS extract and the stripping solutions from dyed cotton fabrics was conducted using LC-MS and UV-Vis spectroscopy, enabling an exploration of how different solvents influence the dissolution of CCS pigments and their dyeing effects on cotton fibers. The results indicated that water is more effective for extracting flavonoid glycosides and proanthocyanidins, whereas ethanol demonstrated superior efficacy in extracting flavonols and flavonol glycosides. Additionally, the dyed samples exhibited significant antibacterial activity against Staphylococcus aureus. The water–ethanol extraction and dyeing technology developed in this study aligns with the principles of sustainable development in green chemistry, providing an environmentally friendly solution for the industrial application of CCS and offering substantial ecological and economic value.