Partition of bioactive components from red pitaya fruit (Hylocereus polyrhizus) peels into different fractions using supercritical fluid fractionation technology

Supercritical extraction of betalains from the peel of different pitaya species

“…In a study with ultrasonic-assisted extraction in S. monacanthus pitaya, 30 it was found that scavenging activity and reducing power were weakly correlated with betacyanin content, being more related to the presence of other bioactive compounds, such as phenolic compounds and flavonoids, which would explain the tendency of the results of this study. Similarly, according to Yu et al, 22 the supercritical fractionation technology of red pitaya peel can significantly increase the antioxidant capacity of the fractions, which was highly correlated with the concentrations of other bioactive compounds, total polyphenolic compounds and total polysaccharides.…”

“…14 Ultrasound-assisted extraction 15,16 has a mechanical effect that improves solvent penetration into the sample matrix, 17 but ultrasonic waves can be associated with undesirable chemical effects, such as the production of free radicals. 18 Supercritical fluid extraction [19][20][21][22] has several advantages over conventional methods, as it uses non-toxic and non-explosive extraction solutions, which are easy to remove from the final extract and do not cause significant chemical changes in the compounds, low extraction temperature, continuous flow of fresh fluid, rapid mass transfer and high selectivity. 9,23 The use of supercritical fluids in the extraction of bioactive compounds from the peel of pitaya species has been little studied.…”

“…9,23 The use of supercritical fluids in the extraction of bioactive compounds from the peel of pitaya species has been little studied. [19][20][21][22] Thus far, those studies were focused on the extraction of betalains from S. monacanthus species. To the best of our knowledge, there is a lack of information about the employment of extraction assisted by supercritical fluids and the optimization of variables for recovery and fractioning of betalains from other pitaya species such as S. costaricensis W. and S. undatus H.…”

Extraction of pectin from Ethiopian prickly pear fruit peel and its potency for preparing of cellulose-reinforced biofilm

“…This objective was reached by depolymerizing the galacturonan chain and lowering the free acid concentration. Gel formation, as a consequence of the pectin being significantly degraded, increases with a higher equivalent weight, while gel dissolution, as a result of a lower equivalent weight, decreases with a higher D-galacturonic acid (GalA) concentration [50]. In most cases, the corresponding weight of the extracted pectin from EPP types was smaller, indicating weaker gel formation.…”

“…The films created in this work using EPP (EPP-Fs) showed tensile strengths between 28 and 36 MPa (Figure 7). Cellulose-EPP composite was prepared by adjusting the ratio of EP pectin to cellulose by adding up to 8% w/w for better reinforcement property, as demonstrated by the work of Yu et al [50]. Unreinforced polymers were found to have tensile strengths between 16 and 32 MPa, and these values increased with reinforcing.…”