Functional geraniol-Ca(OH)₂ composite/sodium acetate alginate film on nonwoven polyethylene sheet: acetic acid gas production in response to acid

摘要

An alginate film, which released geraniol under ordinary conditions and produced acetic acid gas in response to acid, was directly prepared on a polyethylene nonwoven sheet. This alginate film was composed of geraniol-calcium hydroxide [Ca(OH)₂] composite, which was prepared by mixing geraniol and calcium oxide (CaO), and sodium alginate solution (Na-Alg) containing sodium acetic acid (CH₃COONa). Geraniol release from the alginate film could be monitored over time. Optimal conditions for the alginate film preparation were 0.75 or 1.0% Na-Alg solution containing 10% (w/v) CH₃COONa. Acetic acid (~3.58 ppm) could be generated from the sheet under these conditions by dropping 1.0 M hydrochloric acid (0.3 mL) onto it. We successfully prepared a functional sheet, which changed its released odor from geraniol to acetic acid gas in response to acid.