SEQUENTIAL PROCESSING OF Psidium guajava L. LEAVES: STEAM DISTILLATION AND SUPERCRITICAL FLUID EXTRACTION

Abstract

Extracts from the leaves of Psidium guajava L have been studied due to their importance as a source of natural antioxidant components with possible applications in the pharmaceutical and food industries. In this work, the sequential use of steam distillation and supercritical fluid extraction was studied to obtain the essential oil from the leaves and non-volatile compounds from the residue. The non-volatile compounds were obtained by CO 2 supercritical extraction. Experiments were performed in a automated pilot-scale extractor at constant pressure of 15 MPa, at 313 K and 333 K in three different flow rate conditions. The analysis of the essential oil with GC-MS identified E-caryophyllene, β-selinene1, α-selinene, selin-11-en-4-α-ol and E-nerolidol as main compounds. Antioxidant activity was observed in all extracts. The experimental extraction curves were compared to simulated ones predicted by a mathematical model based on mass transfer principles with two adjustable parameters. The model used fitted accurately the experimental data.

The Response Surface Optimization of Supercritical CO2 Modified with Ethanol Extraction of p-Anisic Acid from Acacia mearnsii Flowers and Mathematical Modeling of the Mass Transfer

“…Comparing the models with the experimental data, the Sovová model fits better in the initial extraction stage, which suggests that the grinding of A. mearnsii flowers increases the solute availability. The linear behavior at the beginning of extraction is observed by several authors [40,[59][60][61][62][63] and is associated with the saturation of the particle surface, caused by grinding and its subsequent exposure to the extract. Despite being a simplified model, the model proposed by Crank presented a better fit with the data.…”

A review of essential oils and their properties in the genus Campomanesia (Myrtaceae) from the Brazilian Cerrado

“…However, in some cases, leaves have similar, low, yields (0.016 -0.4%) Pascoal et al, 2011;Stefanello et al, 2008), yet limonene, often the dominant EO, can yield 13 -21% (Viscardi et al, 2017a). To add to the complexity, while most studies used dried materials for extraction, drying the material, and the extraction methods themselves as they were used, may not be important (Silva et al, 2019a;Silva et al, 2013). We reiterate the need for standardizing all steps in the process of extracting EOs.…”

Amazon and Brazilian Polyherbal Preparation for Treatment of Necrotizing Fasciitis

“…(black capinuriba or Brazilian Rubus), Ischnosiphon polyphyllus (arumã), Jatropha gossypiifolia (Pinhão-Roxo or Pião-Roxo) was used to design a protocol in order to regress and cure necrotizing fasciitis. This decoction has shown antibiotic and anti-inflammatory properties with no side effects based on the scientific literature that reports experiments carried out in vitro and/or in vivo with these plants [3][4][5][6][7][8][9][10][11][12][13][14][15].…”

“…The guava tree is a small tree native to Central and South America [14]. This plant contains catechin and it is active against Gram-positive bacteria [11].…”