Green Downscaling of Solvent Extractive Determination Employing Coconut Oil as Natural Solvent with Smartphone Colorimetric Detection: Demonstrating the Concept via Cu(II) Assay Using 1,5-Diphenylcarbazide. - Kesonkan, Kullapon; Yeerum, Chonnipa; Kiwfo, Kanokwan; Grudpan, Kate; Vongboot, Monnapat (Molecules, 2022)