Optimization of ultrasound-assisted extraction of polyphenols from globe artichoke (Cynara scolymus L.) bracts residues using response surface methodology [pdf]

Self Cite

Section: Reagents and Samplesmentioning

confidence: 99%

Optimization of ultrasound-assisted extraction of polyphenols from globe artichoke (Cynara scolymus L.) bracts residues using response surface methodology

Quispe-Solano¹,

Valenzuela²,

Cruz³

et al. 2021

Self Cite

“…The fine flour of artichoke bracts was mixed in a 1:10 ratio (bract flour:water:ethanol extraction solution (1:1, v/v)) and placed in amber colored jars and covered with aluminum foil. Ultrasound-assisted extraction (UAE) was carried out using Kisker 053275 ultrasound device (Kisker Ultrasonic, Steinfurt, Germany) with 1.4 L capacity, 42kHz frequency, and 230 V at 97% radiation amplitude, 53% ethanol concentration, and 9.7 min extraction time, as described in a previously published work (Quispe et al, 2021). The obtained solution was centrifuged in Falcon tubes at 400 rpm for 15 min, filtered with Whatman No.…”

Section: Extractsmentioning

confidence: 99%

Nanoencapsulation by ionic gelation of polyphenols from artichoke (Cynara scolymus L.) residues using ultrasound

Solano¹,

Valenzuela²,

Silva³

et al. 2023

Background. Artichoke (Cynara scolymus L.) residues are a rich source of phenolic compounds, but these compounds are susceptible to external factors. Therefore, nanoencapsulation by ionic and ultrasound-assisted gelation techniques can be used as an alternative to preservation. This work aimed to determine the effects of the interaction of the following variables: chitosan (Ch) concentration, sodium tripolyphosphate (TPP), Ch/ TPP ratio, pH, and sonication time to ensure high encapsulation efficiency (%EE). Materials and methods. Optimal nanoencapsulation conditions were evaluated using a 2 5-1 fractional factorial design to maximize nanoencapsulation efficiency (%EE) using multivariate regression analysis. Results. The model was adequate with R 2 = 0.998. The optimum conditions for nanoencapsulation were Ch (0.28%), TPP (0.29%), Ch/TPP (5/1), pH (4.9) and sonication time (4.79 min). Under these conditions, a %EE of 69.9 ±0.67%, a particle size between 72.3 nm and 460.7 nm, a polydispersity of 0.458, and a charged Z potential of +15.73 mV were determined. In addition, the results showed a good loading of DPPH radical cutting activity 24.21 mM TE and Trolox equivalent antioxidant capacity (TEAC) of 16.45 mM TE in the nanocapsules, which allowed the antioxidant activity of polyphenols to be maintained. Conclusions. The 2 5-1 fractional factorial design was successfully applied to optimize the individual and interactive effects of the variables during the gelation nanoencapsulation process of artichoke waste polyphenols. Experimental and predicted values showed closely related values. Finally, the nanocapsules obtained with the highest %EE were characterized by particle size, Z-potential and polydispersity index (PDI) and showed good DPPH radical scavenging antioxidant activity loading and Trolox equivalent antioxidant capacity (TEAC).

“…The Adj R-squared of the five response values is close to the R-squared value, which verifies that the measured value and the predicted value have high fitting accuracy, so the feasibility of the experimental method is proved. Moreover, lower values of the coefficient of variation (CV) clearly show that the deviation between the experimental and predicted values is minimal (Quispe et al, 2021). The quadratic regression model was established based on the data provided by the Box-Behnken design.…”

Section: Effects Of Time and Inoculum Size On Jujube Juice Fermented ...mentioning

confidence: 99%

Process optimization of a novel water kefir drink with high antioxidant activity from Chinese jujube (Ziziphus Jujuba Mill.) Through response surface methodology

Xu,

Shu,

Dai

et al. 2023