Recovery of Anthocyanins from Pulp Wash of Pigmented Oranges by Concentration on Resins

Abstract

A pulp wash (PW) coming from a plant for citrus processing of pigmented oranges was utilized as a starting material to recover anthocyanins, using the procedure of concentration on resin. Six commercial food-grade resins were tested to find the more suitable ones for adsorbing anthocyanins, and 96% ethanol was used as eluent for desorbing them. An automated experimental apparatus was developed to perform the adsorption-desorption procedure on column. The kinetics results in a batch system and experiments on column showed that the more efficient resins are those made of styrene-divinylbenzene having a pore radius ranging from 70 to 150 A and a surface area from 600 to 800 m(2)/g, namely, Sepabeads SP 70 and Relite EXA 90. The richest fractions collected from these resins contained about 95% of the anthocyanins in a volume of about 2% of the loaded PW. The HPLC profile of the desorbed anthocyanins is the same as that in PW. These fractions contain other phenol compounds, such as hesperidin and derivatives of hydroxycinnamic acids, in remarkable amounts. Ethanol can be easily removed from the solution and recycled, thus affording a much more concentrated product which can find application as a food colorant or antioxidant ingredient for a nutritional integrator.

Potato Peel as a Source of Important Phytochemical Antioxidant Nutraceuticals and Their Role in Human Health - A Review

“…2. Significant positive correlation between dosing of potato peel extract and SOD levels in rats treated with CCl 4 3. histopathological studies showed that CCl 4 induced a remarkable degeneration in hepatocytes and focal necrosis. However, in general, lesions were markedly diminished in rats that were pre-administered with potato peel extract prior CCl 4 administration.…”

“…Lignin content was found to decrease but total dietary fiber content was unaffected in extruded abrasion peels. 4 Protective role of the potato peel extract against induced liver injury using CCL 4 in rats.…”

“…Sanitation and disposal problem of food processing by-products is priority hence many approaches were suggested including recycling of such ingredients and utilize in several food and / or non-food applications (1). By-products of food processing is an inexpensive, affordable, and valuable starting material for the extraction of value added products such as dietary fiber, natural antioxidants, biopolymers, and natural food additives (2)(3)(4). However, the central dogma is still the stability, and economic feasibility of the processing development (5,6).…”

Resin Adsorption and Ion Exchange to Recover and Fractionate Polyphenols

“…In this process, the pigments may be purified and concentrated by sorptive binding onto a resin surface and subsequent desorption with ethanol. The eluates recovered under such conditions further contain hesperidin and hydroxycinnamic acids, which may act as co-pigments and stabilize anthocyanins (Di Mauro et al, 2002). The same group further studied the potential of liquid residues, i.e., wastewater originating from citrus processing, for the recovery of valuable phenolic compounds.…”

Extraction and Advanced Adsorbents for the Separation of Perillaldehyde from Perilla frutescens (L.) Britton var. crispa f. viridis Leaves

“…Experimental equilibrium data were fitted to the Langmuir and Freundlich isotherm models to compare adsorption of resins (Mauro et al, 2002). These isotherms are represented mathematically as:…”