材料科学英语南京林业大学编Unit 7 Lecture 3 Safety of food contact materials.pptx

Unit7ThesecurityofMaterials1TextANanoscalematerialsandEHSTextBSafetyoffoodcontactmaterials

Lecture3SafetyoffoodcontactmaterialsObjectives:1.Thestatusquoofthecontrollingoffoodcontactmaterials2.Thepotentialeffectsoffoodcontactmaterialsonhumanhealthandtheenvironment3.Howtoaddresstheissuesrelatedtofoodcontactmaterials2

Part1Thestatusquoofthecontrollingoffoodcontactmaterials

TheFDA’scategorizationoffoodcontactmaterialsFoodcontactmaterials:polymers,resins,coatings,etc.Thecurrentregulation:Classifyfoodcontactmaterialsas“indirectfoodadditives”(meaningthatthesesubstancesarenotsupposedtochangethefoodtheytouch).Consequences:thecurrentclassificationmakessuchsubstancesexemptfromfoodingredientlabelingrequirements,sofoodpackagingchemicalsarenotdisclosed.

Part2Thepotentialeffectsoffoodcontactmaterialsonhumanhealth

Substancesinfoodcontactmaterialsmaymigrateintofood.Thechemicalbreakdownandby-productsoffoodcontactmaterials,whichismotformulatedinthepackaging,willalsodoharmtohumanhealth.Inrealitywe’reexposedtomultiplechemicalsconcurrently,andasinglesubstancemayinteractwithfood,humanbodiesortheenvironment.Howfoodcontactmaterialsdoharmtohealth

Part3Thepotentialeffectsoffoodcontactmaterialsonenvironment

Largequantitiesoflong-lastingplasticpackagingsuchasplasticbagsorpolystyrenecanposephysicalandchemicalhazardsformarineandaquaticlife.PVCplasticscanreleasedioxinsandfurans—bothpersistentcarcinogens—ifsubjectedtoincompletecombustion.Otheradditivesusedinplastics—suchasplasticizers,stabilizers,andflameretardants–canalsobereleasedtotheenvironmentduringdisposal.Howfoodcontactmaterialsinfluenceenvironment

Part4Howtoaddresstheissuesrelatedtofoodcontactmaterials

Consumers:reducehomecontactoffoodandbeverageswith