Characterization and Separation Performance of a Novel Polyethersulfone Membrane Blended with Acacia Gum

Novel polyethersulfone (PES) membranes blended with 0.1–3.0 wt. % of Acacia gum (AG) as a pore-former and antifouling agent were fabricated using phase inversion technique. The effect of AG on the pore-size, porosity, surface morphology, surface charge, hydrophilicity, and mechanical properties of PES/AG membranes was studied by scanning electron microscopy (SEM), Raman spectroscopy, contact angle and zeta potential measurements. The antifouling -properties of PES/AG membranes were evaluated using Escherichia coli bacteria and bovine serum albumine (BSA). The use of AG as an additive to PES membranes was found to increase the surface charge, hydrophilicity (by 20%), porosity (by 77%) and permeate flux (by about 130%). Moreover, PES/AG membranes demonstrated higher antifouling and tensile stress (by 31%) when compared to pure PES membranes. It was shown that the prepared PES/AG membranes efficiently removed lead ions from aqueous solutions. Both the sieving mechanism of the membrane and chelation of lead with AG macromolecules incorporated in the membrane matrix contributed to lead removal. The obtained results indicated that AG can be used as a novel pore-former, hydrophilizing and antifouling agent, as well as an enhancer to the mechanical and rejection properties of the PES membranes

Parenteral provision of micronutrients to adult patients: an expert consensus paper

Background:Micronutrients, an umbrella term used to collectively describe vitamins and trace elements, are essential componentsof nutrition. Those requiring alternative forms of nutrition support are dependent on the prescribed nutrition regimen for theirmicronutrient provision. The purpose of this paper is to assist clinicians to bridge the gap between the available guidelines’recommendations and their practical application in the provision of micronutrients via the parenteral route to adult patients.Methods:Based on the available evidenced-based literature and existing guidelines, a panel of multidisciplinary healthcareprofessionals with significant experience in the provision of parenteral nutrition (PN) and intravenous micronutrients developedthis international consensus paper.Results:The paper addresses 14 clinically relevant questions regarding the importance and use ofmicronutrients in various clinical conditions. Practical orientation on how micronutrients should be prescribed, administered, andmonitored is provided.Conclusion:Micronutrients are a critical component to nutrition provision and PN provided without thempose a considerable risk to nutrition status. Obstacles to their daily provision—including voluntary omission, partial provision, andsupply issues—must be overcome to allow safe and responsible nutrition practice