Characterization of Ionic Exchange and Macroporous Resins for Their Application on the Separation and Recovery of Chlorogenic Acid from the Wastewater of Artichoke Blanching

Abstract

Food wastes have traditionally been considered as dead-end materials; however, recent international, national, and regional policies strongly promote the use of these wastes as potential resources. This change of perception considers the need for sustainable exploitation of natural resources. In this context, artichoke processing produces high amounts of wastewaters, and specifically, wastewaters from the artichoke blanching step present a high content of valuable biocomponents such as carbohydrates and phenolic compounds (e.g., chlorogenic acid, 1700 ppm). In this work, the recovery of chlorogenic acid by applying sorption processes was studied. Five resins were tested, and it was found that the resin XAD 7 HP presented the best total adsorption-desorption yield (72.8%) at 20 °C. It was also found that there was a strong variation of the adsorption ratio depending on solution pH (3–7). Four models of isotherms were applied to the adsorption processes, and the Langmuir isotherm better explained the adsorption behavior. The kinetic study showed that the adsorption and desorption of chlorogenic acid followed a pseudo-second order model where the kinetic constant depended on the adsorbate concentration. In addition, it was found that the sorption process was controlled by more than just the intraparticle diffusion mechanism.

Response Surface Optimization of Inulin and Polyphenol Extraction from Artichoke (Cynara scolymus (L.)) Solid Wastes

“…Phenolic compounds are secondary metabolites that protect the plant against biotic and abiotic stress [15,16]. The phenolic compounds included in the globe artichoke are mainly chlorogenic acid, cynarin, apigenin-7-O-glucoside, luteolin, cynaroside, scolymoside, phenolic acids, mono-and dicaffeoylquinic acids and flavonoids [6,[17][18][19]. The consumption of foods rich in polyphenols has proven health benefits, such as anti-allergenic, anti-artherogenic, anti-inflammatory, anti-microbial, antioxidant, anti-thrombotic, cardioprotective and vasodilatory effects [16,20].…”

Feasibility of a Selective Epoxidation Technique for Use in Quantification of Peracetic Acid in Air Samples Collected on Sorbent Tubes

“…The strategy described here employed active gas-phase sampling using XAD-7 sorbent, whose acrylic acid composition allows for the capture of polar compounds more readily than hydrophobic sorbents (i.e., XAD-2 and XAD-4) . This has been demonstrated with a number of organic acids and other highly oxygenated compounds. − PAA was quantified indirectly through cyclohexene oxide (CHO), the epoxide product generated from the Prilezhaev reaction following the introduction of cyclohexene. This technique was tested using 4 h sampling periods, which could be useful for assessing the longer-term personal exposure of workers to PAA.…”