Effect of heat treatment on efficacy of Thai bentonite for adsorption of aflatoxin B1 in vitro

摘要

ThisresearchevaluatedtheeffectsofheattreatmentsontheefficacyofThaibentonite(TBN)foradsorptionofaflatoxinB1(AfB1)invitro.TheTBNclaysweregroundtosizeslessthan40,60,100and200μmandheatedfor1houratelevenheatingtemperaturesat25°Candfrom100°Cto1000°C,atincrementsof100°C.Claysweremixedseparatelywith5ppmAfB1solutionandshakenat1,000rpmfor24hours.AdsorptioncapacitiesforAfB1bytheTBNclaysweredeterminedusingaUV-spectrophotometer.nbsp;Resultsrevealedthatadsorptioncapacitiesweresignificantlyincreased,whentemperaturesreached400°Cand500°Cascomparedtolowertemperatures(p0.05).Thehighestadsorptioncapacitywasobservedinclayheatedat600°C,whichwassignificantlygreaterthanatothertemperatures(p0.05).Significantlyloweradsorptioncapacitieswereobservedintheclaysheatedat800°C,900°C,and1000°C.Furthermore,sizesoftheTBNwerenotsignificantlyrelatedtotheadsorptioncapacitiesamongtheclaysamples(p0.05).TheresultssupporttheconclusionsthatTBNcanefficientlyadsorbAfB1invitroandheatingtheclayatoptimaltemperatures(600°C)canincreasetheadsorptioncapacityforAfB1.nbsp;