DEVELOPMENT OF TEMPERATURE CONTROL LED SOLAR DRYER FOR PREPARATION OF LADDU FROM GREEN GRAM SPROUTS

HEMALATHA, K. et.al.VENKATREDDY, K.2018-07-172018-07-172017CAES 29http://krishikosh.egranth.ac.in/handle/1/5810060573GreengramisoneoftheimportantpulsecropsofIndia.Greengramisaproteinrich staplefood. Itcontainsabout25percentprotein,whichisalmostthreetimesthatofcereals. Sproutsarerichinnutritionandarecalledlivingfood.Theycontainenzymesandaresourceof manyaminoacidsandvitamins.Atthesametime,theyarepronetomicrobialgrowthbecauseof high moisture content and nutrition. Their shelflife is less than 6 hours. Also, they have characteristicpulseodourwhichmakesthemunacceptablebysomepeople in itsraw form particularlychildren. LadduisapopularproductinIndiamadefrompulseorcereal ﬂours,sugarandother ingredients.Greengramsproutscanbedriedandmadeintoladdususingjaggary,gheeandother llavoringagentslikecinnamonorcardamom. Thegreengramsproutsdryingcanbetakenupusingsundrying.But,withsundrying thereisachanceofcontaminationandconstantsupervisionisrequired.Thedriedproductmay heunhygienic.Conventionaldriersliketraydryer,kitchendryerordrumdryercanbeusedfor drying.But,theyarecostlyandenergyintensive.Asolardryercanbemadeinvillageswiththe locallyavailablematerialslikeMSangleironpieces,metalsheet,aluminum,glassandwood. Inaconvectiontypesolardryer,thedryeref ﬁ ciency iscontinuouslychangingduringthe drying process due to changes in solar radiation and atmospheric temperature. At drying temperaturesmorethan550C,thenutritionalqualityofsproutsdecreases.KeepingthisinView, atemperaturecontrollermodulewithatemperaturesensorwithcutofftemperatureof50°Chas beendeveloped.Usingthismodule,temperatureofthesolardryerwaskeptbelow500Cfor dryingsprouts.Driedsproutswereground,sievedandladduswerepreparedwithjaggerysyrup at60°Brix,70°Brix&80°Brix.Ladduswerestored14daysfordeterminingtheirshelflife. From the results, it is observed that temperature controlled solar dryer is most recommendedcomparedtotraydryerandsundrying.Fromthesensoryevaluation,itisobserved thatwith70°Brixjaggerysyrup,greengramsproutsladduwasacceptablefortasteandoverall acceptance.Theshelflifeoftheproductwasgoodfortheobservationalperiodof14days.ennullDEVELOPMENT OF TEMPERATURE CONTROL LED SOLAR DRYER FOR PREPARATION OF LADDU FROM GREEN GRAM SPROUTSTechnical Report