Abstract
The separation, concentration and transport of the amino acids through membranes have been continuously developed due to the multitude of interest amino acids of interest and the sources from which they must be recovered. At the same time, the types of membranes used in the sepa-ration of the amino acids are the most diverse: liquids, ion exchangers, inorganic, polymeric or composites. This paper addresses the recuperative separation of three amino acids (alanine, phe-nylalanine, and methionine) using membranes from cellulosic derivatives in polypropylene ma-trix. The microfiltration membranes (polypropylene hollow fibers) were impregnated with solu-tions of some cellulosic derivatives: cellulose acetate, 2-hydroxyethyl-cellulose, methyl 2-hydroxyethyl-celluloseand sodium carboxymethyl-cellulose. The obtained membranes were characterized in terms of the separation performance of the amino acids considered (retention, flux, and selectivity) and from a morphological and structural point of view: scanning electron microscopy (SEM), high resolution SEM (HR-SEM), Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectroscopy (EDS) and thermal gravimetric analyzer (TGA). The re-sults obtained show that phenylalanine has the highest fluxes through all four types of mem-branes, followed by methionine and alanine. Of the four kinds of membrane, the most suitable for recuperative separation of the considered amino acids are those based on cellulose acetate and methyl 2-hydroxyethyl-cellulose.
Highlights
Amino acids are substances whose biological role, when incorporated into protein molecules, neurotransmitters, or hormones and in precursors of other molecules, has led to a continuous development of fundamental and applied research [1,2]
This paper addresses the recuperative separation of three amino acids from synthetic solutions, using membranes from cellulosic derivatives in polypropylene hollow fiber matrix
Remarkable results were obtained in this field through membrane processes, but further research considers both the recovery of amino acids from poor sources and the creation of physical-chemically resistant biocompatible membranes—especially for sterilization or cleaning in order to reuse or maintain process performance
Summary
Amino acids are substances whose biological role, when incorporated into protein molecules, neurotransmitters, or hormones and in precursors of other molecules, has led to a continuous development of fundamental and applied research [1,2]. Membranes 2021, 11, 429 aspects of this structure is given by the presence of electrical charges in amino acids [52 –o7f ]2,4 regardless of the pH of the aqueous solution in which they are found (Figure 1b). TAhlel tphreospeecrhtiaersaocftearnistaimcsi,nboutacaildsowthilel amlsuoltbipeleincfhlueemnicceadlsb, ybitohloegRicgarloaunpd, bwiohmicehdciacanl gaipvepltihceatmioonlsecmualeksepiet cnieficceisnstaerryacttoiornecso: hvyerdraompihnoobaic,idhsydfrroomphainliyc, soorurrecdeo, xe,vdeenpwenhdeinngthoenir tchoenacteonmtrsatthioant misalkoewit[1u2p–[1178],.19] All these characteristics of amino acids allowed researchers toTahdedprersosptehretiems oosftavnaarmiedintoecahcindiqwuiellsaalnsodbmeeinthfloudesnocefdsebpyatrhaetiRong,raomupo,nwghwichhicchansogmivee otfhtehmosoeleincuvolelvsipnegcimficeminbterarancetsioanrse:phryedseronptehdoibnicT, ahbylder1op[2h0i–li5c9, ]o.r redox, depending on the atoms that make it up [18,19]. Each method or process of membrane separation, concentration, or purification of amino advantages and disadvantages and must be correlated with the processing system, so as to meet both selectivity and productivity requirements [60]. This paper addresses the recuperative separation of three amino acids (alanine, phenylalanine, and methionine) from synthetic solutions, using membranes from cellulosic derivatives (cellulose acetate, 2-hydroxyethyl-cellulose, and methyl 2-hydroxyethyl-cellulose or sodium carboxymethyl-cellulose) in polypropylene hollow fiber matrix
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