Adulterant Detection in Peppermint Oil by Means of Holographic Photopolymers Based on Composite Materials with Liquid Crystal

Diffraction gratings are recorded in a holographic photopolymer containing nematic liquid crystal and peppermint oil. The presence of the oil modifies the polymerization and the holographic response. The composite containing oil adulterated with triethyl citrate obtains a diffraction efficiency related to the oil’s purity. The results obtained suggest the possibility of developing a holographic chemical analysis method for quality control of raw materials. Ministerio de Ciencia e Innovación (Spain) under projects; PID2019-106601RB-I00 FIS2017-82919-R; Generalitat Valenciana (Spain) under projects: IDIFEDER/2021/014; (cofunded by European Union through the FEDER Programme) PROMETEO 2021/006.