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SEM images of fibers with 1% w/w extract and varying shellac concentrations of (A) 36% w/w, (B) 38% w/w, and (C) 40% w/w as well as fibers with 38% w/w shellac and varying extract concentrations of (D) 1% w/w, (E) 3% w/w, and (F) 5% w/w obtained under electrospinning conditions of 0.8 mL/h solution feed and 18 kV electrical voltage.
