Oct 11, 2019 · For GC-MS analysis, Aijiren gas chromatograph (GC) and a 5973 quadrupole mass spectrometer (MS). Chromatographic separation was performed by 30 m, HP-5 5% phenyl–methyl siloxane column (Aijiren 19091J-433) with an I.D and thickness of 0.25 mm (Aijiren Technologies Inc., Santa Clara, CA, United States). Methods