<P><B>Abstract</B></P> <P>The current study evaluates the detoxification of acid pretreatment liquor (APL) using adsorbent (ADS 400 & ADS 800) or ion-exchange (A-27MP & A-72MP) resins and its potential for amino acid production. The APL is generated as a by-product from the pretreatment of lignocellulosic biomass and is rich monomeric sugars as well as sugar degradation products (fermentation inhibitors) such as furfural and hydroxymethyl furfural (HMF). Of the four resins compared, ADS 800 removed approximately 85% and 60% of furfural and HMF, respectively. ADS 800 could be reused for up to six cycles after regeneration without losing its adsorption properties. The study was further extended by assessing the fermentability of detoxified APL for <SMALL>L</SMALL>-lysine production using wild and mutant strains of <I>Corynebacterium glutamicum</I>. The detoxified APL was superior to APL for <SMALL>L</SMALL>-lysine production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Detoxification of APL using adsorbent (ADS 800 & ADS 400), ion-exchange (A-27MP & A-72MP) resins. </LI> <LI> ADS 800 resin removed 85% furfural and 60% of HMF from APL. </LI> <LI> Detoxified APL was superior to APL <SMALL>L</SMALL>-lysine production. </LI> <LI> ADS 800 resin could reuse up to six cycles after regeneration. </LI> </UL> </P>