1. Gani SSA, Azahar NF, Mokhtar NF (2018) Response surface optimization of high antioxidative extraction from Curcuma zedoaria leaves. J Adv Res Fluid Mech Therm Sci 43(1):90–103
2. Rahim NA, Zakaria N, Dzulkarnain SMH, Mohd N, Azahar ZM, Abdulla MA (2018) Antioxidant assay of alstonia angustifolia ethanolic leaf extract. J Adv Res Fluid Mech Therm Sci 1(1):80–86
3. Rahim NFAR, Norhayati M, Abdullah N, Talib BA, Jihan N, Dusuki S (2018) Optimization of the antioxidant properties of the polyherbal formulations. J Adv Res Fluid Mech Therm Sci 1(1):16–25
4. Mokhtar N, Nordin MFM, Morad NA (2018) Total phenolic content, total flavonoid content and radical scavenging activity from Zingiber zerumbet rhizome using subcritical water extraction. Int J Eng 31(8):1421–1429
5. Dykes L, Rooney LW, Waniska RD, Rooney WL (2005) Phenolic compounds and antioxidant activity of sorghum grains of varying genotypes. J Agric Food Chem 53(17):6813–6818