Extraction and Characterization of Natural Dye from Green Walnut Shells and Its Use in Dyeing Polyamide: Focus on Antibacterial Properties

Table 1

Comparison 𝑅_𝑓 of some base colors in the walnut dye.

Sample	Solvent	𝑅𝑓
1–4	n-Hexane/petroleum ether (95 : 5, v/v)	𝑅𝑓=0.61
5–10	Petroleum ether/diethyl ether (50 : 50, v/v)	𝑅𝑓=0.89, 𝑅𝑓=0.79, 𝑅𝑓=0.74, 𝑅𝑓=0.68, 𝑅𝑓=0.22, 𝑅𝑓=0.50
11–15	Petroleum ether/Diethyl ether (55 : 45, v/v)	𝑅𝑓=0.76, 𝑅𝑓=0.64, 𝑅𝑓=0.29, 𝑅𝑓=0.18, 𝑅𝑓=0.08
16–21	n-Hexane/petroleum ether (90 : 10, v/v)	𝑅𝑓=0.42, 𝑅𝑓=0.32, 𝑅𝑓=0.21, 𝑅𝑓=0.11
22–27	Petroleum ether	𝑅𝑓=0.47, 𝑅𝑓=0.12