Coupling Ultrafiltration-Based Processes to Concentrate Phenolic Compounds from Aqueous Goji Berry Extracts

Abstract

In this work, a membrane-based process for the purification and concentration of antioxidant compounds from aqueous Goji (Lycium barbarum L.) berry extracts was investigated. The aqueous extract was previously clarified with hollow fiber ultrafiltration (UF) membranes in order to remove suspended solids and β-carotene and to produce a clarified extract enriched in phenolic compounds. Then, three UF flat sheet polyamide membranes with a molecular weight cut-off (MWCO) in the range 1000–3500 Da were tested to purify and concentrate phenolic compounds from the clarified extract. The effect of MWCO and transmembrane pressure (TMP) on the performance of selected membranes in terms of productivity and selectivity towards total dissolved solids (TDS), total phenolic compounds (TPC), total carbohydrates (TC) and total antioxidant activity (TAA) was evaluated. Experimental results indicated that the 2500 Da membrane exhibited a lower fouling index, higher cleaning efficiency, lower rejection towards carbohydrates (lower than 30%) and higher rejection towards phenolic compounds (higher than 50%) in comparison to the other investigated membranes. The inclusion of a diafiltration process in the treatment of the clarified extract with this membrane in a spiral-wound configuration improved the concentration of sugar compounds in the permeate stream and increased the purification of phenolic compounds in the retentate fraction.

Biorefinery of Tomato Leaves by Integrated Extraction and Membrane Processes to Obtain Fractions That Enhance Induced Resistance against Pseudomonas syringae Infection

“…In this particular case, the material is the same, so the nature of the physical-chemical interactions is the same and, as expected, the observed rejection is higher for the lower NMWCO membrane. Similar rejection results against carbohydrates and biophenols were obtained by Conidi et al [39], using 1 kDa polyamide and polyethersulfone membranes, but starting from another solanaceous crop extract (Goji leaves). When filtrated with the CA membrane, the same rejection was observed for both categories of biomolecules, showing lower membrane selectivity for the treated compounds and further confirming the role of membrane material in the separation.…”

Enrichment of Cookies with Fruits and Their By-Products: Chemical Composition, Antioxidant Properties, and Sensory Changes

“…These compounds condition the health-promoting properties of the fruits. Goji berries are rich in flavonoids, such as quercetin-3- O -rutinoside and kaempferol-3- O -rutinoside, and phenolic acids, such as chlorogenic, p -coumaric, and caffeic acids [ 104 , 105 ]. Bora et al [ 106 ] incorporated goji berry pomace powder into cookies and muffins because of the variety of bio-components in the raw material and the potential economic benefit of eliminating waste disposal costs.…”

Aumento da atividade anticoagulante da varfarina e sua potencial interação com o extrato aquoso de goji berry (Lycium barbarum L.) em ratos Wistar

“…Pesquisas anteriores indicaram que o goji berry é uma fonte valiosa de ácidos cafeico, p-coumárico, ferúlico e clorogênico, rutina, quercetina, morina, mircetina, apigenina, miricitrina, catequina, epicatequina e o kaempferol (Qian, Liu & Huang, 2004;Le, Chiu, & Ng, 2007;Forino et al, 2016;Protti et al, 2017;Conidi, Drioli & Cassano, 2020).…”