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Influence of pH and operation variables on biogenic amines nanofiltration

机译：pH和操作变量对生物胺纳米过滤的影响

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This work analyzes the ability of nanofiltration membranes to separate biogenic amines.Biogenic amines evolve in fermented foods and beverages and may have toxic effects.Model solutions of putrescine,histamine and tyramine in a wide range of pH were tested using an organic membrane with a molecular weight cut-off(MWCO)of 1000 Da and an isoelectric point(IEP)of about 7.Feed pH strongly influenced solute rejection.In acidic conditions up to pH 4,rejections of around 98,96 and 90% were attained for histamine,putrescine and tyramine,respectively.Very low rejections of 5-10% were found at neutral pH and only moderate 20-40% rejections were generally observed in the alkaline zone.Furthermore,proton rejection was negative up to pH 6 and positive above this pH,regardless of the amine tested.The results were discussed in terms of the changes that pH produces on the electrical charge of both membrane and amines,and consequently on the membrane-solute interactions.Electrostatic repulsion was shown to be the dominant mechanism governing the separation process.In contrast,sieving exclusion did not seem to play a significant role.
机译：这项工作分析了纳滤膜分离生物胺的能力。生物胺在发酵食品和饮料中会进化，并可能具有毒性作用。截留分子量（MWCO）为1000 Da，等电点（IEP）约为7.进料pH值强烈影响溶质截留率。在pH高达4的酸性条件下，组胺的排斥率约为98.96和90％分别为腐胺和酪胺。在中性pH值下，排斥率非常低，为5-10％，在碱性区通常仅观察到20-40％的中度排斥率。此外，在pH值高达6时，质子排斥率是负的，在pH值以上时，质子的排斥率是正的根据pH值在膜和胺上产生的电荷变化以及膜与溶质之间的相互作用对结果进行了讨论，结果表明静电排斥n是控制分离过程的主要机制。相比之下，筛分排斥似乎没有发挥重要作用。

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