Formic acid and methanol were procured from Merck Specialties Private Limited (Mumbai, India).
HPLC grade toluene, 1, 4-dioxan, acetic acid, ethyl acetate, and methanol were procured from Hi-Media (Mumbai, India).
Each crystal wafer of 10 × 10 mm2 size was first shortly treated in boiled methanol and then the unpolished side was procured with the all-area ohmic contact at room temperature by rubbing liquid solution of tin in gallium with a tin rod and a cotton-wool swab.
Acetic anhydride (Analytical grade) was procured from Aldrich, Milwaukee, WI. 1,2-dichloro ethane (DCE), sulfuric acid (assay content, >99%), methanol, and tetra-hydrofuran (THF, analytical grade) were obtained from Merck Ltd., Mumbai, India.
Azadirachtin standard was procured from Sigma Aldrich (St Louis, MO, USA) and dissolved in high-performance liquid chromatography (HPLC) grade methanol (Merck) to yield a stock concentration of 1000 µg mL−1.
A flashlight was procured.
No funding was procured for this work.
Methyl laurate was procured from Fluka.
Chemicals: FeCl2·4H2O (anhydrous) was procured from Sigma-Aldrich, while piperidine (C6H5N) was procured from Merck.
Granular zinc was procured from Xin Hua (China), while granular cadmium was procured from Sinopharm.
