Adsorption of Flavonoids on Resins:  Hesperidin

Abstract

Adsorption of hesperidin from aqueous solutions on styrene-divinylbenzene (SDVB) and acrylic resins was investigated at different pH values (1.5-5.5) and temperatures (10-40 degrees C). Adsorption was not affected by pH variation, whereas it increased on increasing temperature for the SDVB resins and remained substantially unchanged for the acrylic ones. The different behavior of the two types of resins was ascribed to the different wetting, because of their hydrophobic or partially hydrophilic properties, respectively. The equilibrium data at 20 degrees C were determined on 13 commercial resins displaying a wide range of surface areas (S(A), 330-1200 m(2)/g) and pore radii (P(R), 20-260 A). Data were well fitted to the Freundlich isotherm, and its parameters were used to compare the adsorption capacity of different resins. The most effective resin is a SDVB copolymer with the largest S(A) (1200 m(2)/g) and an intermediate P(R) (90 A). The Freundlich constants (K(F)) were rationalized in terms of a two parameter equation, including S(A) and P(R) as independent variables. The adsorption constant increased on increasing both S(A) and P(R) for the resins having P(R) </= 90 A; beyond this limit, the contribution of S(A) was predominant and that of P(R) was slightly negative.

Adsorption and desorption characteristics of adlay bran free phenolics on macroporous resins

“…Additionally, the resins with higher adsorption and desorption ratios had large specific surface areas. And the surface area was another critical factor that affected the adsorption and desorption capacities of adlay bran free phenolics on macroporous resins (Scordino, Di Mauro, Passerini, & Maccarone, 2003).…”

Sustainable sunflower processing — I. Development of a process for the adsorptive decolorization of sunflower [Helianthus annuus L.] protein extracts

“…Therefore, the aim of the present study was the development of an innovative process for polyphenol removal from sunflower protein extracts by adsorption and ion exchange processes. In continuation of previous studies several food-grade adsorbent and ion exchange resins should be evaluated (Bretag, Kammerer, Jensen & Carle, 2009a,b;Kammerer et al, 2007;Scordino, Di Mauro, Passerini & Maccarone, 2003Schieber, Hilt, Streker, Endress, Rentschler & Carle, 2003). In addition to the identification of the most suitable adsorbent material, process conditions should be systematically optimized on laboratory scale.…”

Isolation of polyphenols from the extracts of olive leaves (Olea europaea L.) by adsorption on silk fibroin

“…Since adsorption is a low cost separation technique, it is preferred for the selective recovery of target plant metabolites from the crude extracts [22]. Synthetic adsorbents have been applied for adsorbing valuable polyphenols from plant extracts [23][24][25][26][27][28][29]. Many biopolymers, such as collagen and cellulose have also been used as adsorbents for the recovery of polyphenols and the interaction between the biopolymers and antioxidative polyphenols have been widely investigated [1].…”