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

Figure 1

IR and NMR spectra from the extracted dye: (a) 𝑛-hexane/petroleum ether (90 : 10, v/v), 𝑅_𝑓=0.32, (b) petroleum ether/diethyl ether (50 : 50, v/v), 𝑅_𝑓=0.68, and (c) petroleum ether/diethyl ether (55 : 45, v/v), 𝑅_𝑓=0.64.

(a)

(b)

(c)