Optimization of Oil Extraction from Rice Bran with Mixed Solvent Using Response Surface Methodology

Abstract

In order to improve the extraction ratio of rice bran oil, a single-factor experiment and response surface methodology with a central composite design were used to determine a new mixed solvent and the optimal extraction conditions of the mixed solvent. The effects of solid–liquid ratio, extraction time, extraction temperature, and oscillation speed on the extraction ratio were investigated. The regression equation was established, and the optimal extraction conditions were determined as follows: a solid–liquid ratio of 5.5:1, extraction temperature of 45 °C, extraction time of 12 min, and extraction ratio of rice bran oil of 85.8%. Compared with traditional solvent extraction, the peroxide value, acid value, iodine value, and fatty acid composition content of rice bran oil extracted using the new mixed solvent were close to those of n-hexane and significantly lower than those of solvent No. 6, while the content of oryzanol and total sterol increased to 2.7% and 5.1%. This study can be useful in exploring the possibility of new mixed solvents and provide theoretical guidance and data support for the production practice of new mixed solvents.

Kinetic parameter for scale-up and γ-oryzanol content of rice bran oil as antioxidant: Comparison of maceration, ultrasonication, pneumatic press extraction

“…Beside that, (ii) Solvent Penetration: Effective oil extraction depends on the solvent's ability to penetrate the rice bran efficiently. The oil is dissolved by the study's use of solvents such n-hexane, enabling its separation from the solid [ 21 ]. The yield and oryzanol content are highly dependent on the extraction technique and solvent selection; (iii) Temperature and Pressure Effect; Variations in temperature and pressure, particularly when using the press extraction method, can change the oil's viscosity and facilitate its extraction.…”

“…In extraction processes, it presents the maximum amount of solute (e.g., oil, γ-oryzanol) that can be extract in the solvent; (ii) Differences between Extraction Methods: The extraction method significantly influences the Cs value, because it affects the efficiency and mechanism of solute release the matrix into the solvent. Factors include the method's ability to discrupt cell walls, solute –solvent interaction, and mass transfer efficiency [ 19 , 20 ], and [ 21 ]. Maceration: involves soaking the solid matrix in solvent, relying passive diffusion to extract the solute.…”

Optimization of Oil Extraction from Cocoa Bean Shells Using Three Solvents with Solvent Reusability

“…Therefore, this work aims to fill existing research gaps in oil extraction from CBSs with various solvent types. The design of experiments using RSM can be used for a variety of applications, including oil extraction, biodiesel production, emulsification, pharmaceutical production, and the synthesis of substances. , Thus, RSM is used to determine the most suitable oil yields with the solvent-to-CBS mass ratio, extraction time, and stirrer speed as parameters. The oil production from the recirculating extraction process is also described in terms of the number of extraction cycles, extraction efficiency, and the number of times the reused miscella (RM) is reused.…”

“…Therefore, hexane and ethanol are commonly recommended solvents for oil extraction. 19 Wang et al 20 used response surface methodology (RSM) to optimize oil extraction yields from rice bran with different solvents. Nonpolar solvents have been shown to be more effective in oil extraction than polar solvents.…”

“…Therefore, this work aims to fill existing research gaps in oil extraction from CBSs with various solvent types. The design of experiments using RSM can be used for a variety of applications, including oil extraction, 20 biodiesel production, 30 emulsification, 31 pharmaceutical production, 32 and the synthesis of substances. 33 , 34 Thus, RSM is used to determine the most suitable oil yields with the solvent-to-CBS mass ratio, extraction time, and stirrer speed as parameters.…”