Potential of alternative solvents to extract biologically active compounds from green coffee beans and its residue from the oil industry

Effect of Ecofriendly Bio-Based Solvents on Oil Extraction From Green Coffee Bean and Its Industrial Press Cake

“…The solid-liquid extraction could be employed as a single-process, or combined with the mechanical pressing, in order to optimize this process in terms of recovery efficiency. As reported in a previous study of this research group (Oliveira et al, 2019c), the oil content of the beans and cake, respectively, were 8.6 and 6.3 %, showing the inefficiency of the pressing process in order to extract the oil (< 30%) from the beans, and consequently, reaffirming the advantages of employing the solvent extraction.…”

“…After sifting, the powders were dried (40 °C) in a vacuum oven (16.8 kPa) (Tecnal, TE-395, Piracicaba, Brazil) (approximately 20 days for green coffee beans and 7 days for the cake), and further used in the extraction process. The chemical characterization of the material is available in the work of Oliveira et al (2019c).…”

Multiobjective optimization ofPhoenix dactyliferaL. seeds extraction: Mixture design methodology for phytochemical contents and antibacterial activity

“…(2019) who reported a TFC concentration equal to 6.52 mg QE/g in a binary mixture (acetone–water) at 75/25 (v/v). Likewise, Zhao et al (2006) described greater phenolic extraction with 80% A compared to 80% E, 80% MeOH, and W. The adding of water to organic solvents enhanced the extraction competence, this fact was explained by the attendance of sugars and proteins which are more soluble in water than in ethanol and acetone (Oliveira, Silva, Santos, & Queiroz, 2019; Sagar, Pareek, Sharma, Yahia, & Lobo, 2018).…”

“…As shown in the Table 1, TAC ranged between 2.37 mg/100 g (water) and 5.94 mg/100 g (acetone–ethanol–water at 33.33%). Owing substituent groups, such as –OH, –COOH, and –O–CH 3 groups connected to aromatic rings, anthocyanins, are polar molecules (Oliveira et al., 2019). In addition they are glycosylated, so polar solvents have great affinity with these molecules.…”

Simultaneous extraction of the oil from the kernel and pulp of macauba fruit using a green solvent

“…According to Oliveira, Silva, Santos, and Queiroz (2019) green solvents aim to develop an ecological process through the reduction of pollutants and green chemistry can be defined as the elimination or reduction of solvents (use or generation of hazardous substances), thus, indicating the use of bio‐renewable solvents, derived from natural or agricultural residues (biomass) such as ethanol. Therefore, it is necessary to reduce the use of non‐ecological solvents and promote the use of new environmentally friendly extraction techniques (Mustafa & Turner, 2011).…”