“…Optimizing extraction process Fractional FD (Khalil et al, 2011) Ginger rhizome Determining the optimum extraction conditions Full 2 3 FD (Shah and Garg, 2014) L. sidoides Evaluating the influences of variables of preparation Full 2 3 FD (Lima et al, 2015) Tempeh (a fermented product from soybean) Evaluating factors of the extraction process Full 2 3 FD (Yuliani et al, 2018) C. sinensis L. Analysis of three methylxanthines such as caffeine, theobromine, and theophylline in the matrix of tea, coffee, and human urine was done by validated RP-HPLC/UV (de Aragão et al, 2005).…”