Historyofdevelopment
IntheWeiandJinDynasties,therewasadetergentcalled"BathDou".SunSimiao's"QianJinYaoFang"and"QianJinYiFang"intheTangDynastyrecordedthatthepancreasofpigsWashthedirtyblood,tearoffthefat,grinditintoapaste,addsoybeanpowder,spices,etc.,mixevenly,anddrynaturallytoformbathbeansthatcanbeusedforwashing.Whofirstthoughtofusingpigpancreasfordescaling?Nooneknowssofar,buthemustbeaverysmartman.Intheprocessofmakingbathbeans,thepigpancreasisgroundtoenhancetheexudationofthedigestiveenzymescontainedinthepancreas.Themixedsoybeanmealcontainssaponinandlecithin,thelatterhastheeffectofenhancingfoamingandemulsifyingpower,andnotonlystrengthensInadditiontoitswashingpowerandmoisturizingtheskin,itwasconsideredarelativelyhigh-qualitydetergentatthattime.However,duetothedifficultyinobtaininglargequantitiesofrawmaterialssuchasporcinepancreas,bathbeanswerenotwidelyused,andwereonlyusedbyasmallnumberofupper-classnobles.
Later,peopleimprovedtheproductionprocessofbathbeans.Theyaddedsugarwhengrindingpigpancreas,andreplacedsoyflourwithsodiumcarbonate(soda)orplantash(themainingredientispotassiumcarbonate).Addmoltenlard,mixitevenly,andpressitintoaballorblock.Thisisthe"pancreas".Thelardmeltsat40°C,andthepigpancreasisdecomposedbylipasetodecomposethelardintohigherfattyacids.Thesefattyacidsundergoasaponificationreactionwiththeplantashalkaliagentaddedsubsequentlytoformfattyacidsoaps.Thisisthemainchemicalcompositionofmodernsoap!
Washingfunction
Thechemicalcompositionofpancreasisverysimilartotoday'ssoap.Moreover,theproducttypeswithvariousfloralfragrancesareevenmorediverse,osmanthuspancreas,rosepancreas...Itisquitesimilartotoday'svarioussoapswithdifferentfragrances.
Inaddition,duetothepresenceoflipaseandproteaseinthepancreas,italsohasacompounddecomposingeffectofdirt,whichisverysimilartotheeffectofmodernenzyme-addedlaundrydetergent,whichcanbecalledtheancientenzyme-addedlow-foamingfunctionDetergent.