International Journal of Agriculture, Environment and Biotechnology
Citation: IJAEB: 8(2): 467-476 June 2015
DOI Number: 10.5958/2230-732X.2015.00054.6
©2015 New Delhi Publishers. All rights reserved
AGRICULTURE ENGINEERING
Mass Transfer Kinetics during Osmotic Dehydration of
Pineapple Samples Coated with Pectin
C.ȱS.ȱSaini
Department of Food Engineering and Technology, Sant Longowal Institute of Engineering and Technology (SLIET), Longowal-148106,
Sangrur, Punjab, India.
Corresponding author: charanjiv_cjs@yahoo.co.in
Paper No. 338
Received: 10 September 2014
Accepted: 24 May 2015
Published: 29 June 2015
Abstract
Theȱeffectȱofȱprocessȱconditionsȱonȱtheȱmassȱtransferȱduringȱosmoticȱdehydrationȱofȱcoatedȱpineapplesȱ
wasȱstudied.ȱPineappleȱsamplesȱwereȱcoatedȱwithȱ0.5ȱtoȱ5.0%ȱ(w/v)ȱpectinȱsolutionȱpriorȱtoȱosmoticȱ
dehydrationȱinȱsucroseȱsolution.ȱTheȱtimeȱofȱdippingȱinȱtheȱcoatingȱsolutionȱwasȱkeptȱatȱ60ȱandȱ120ȱsȱ
followedȱbyȱovenȱdryingȱtimeȱofȱ10ȱandȱ40ȱminȱtoȱsolidifyȱtheȱcoating.ȱWaterȱloss,ȱsolidȱgain,ȱperformanceȱ
ratioȱandȱweightȱreductionȱwereȱmeasuredȱduringȱosmoticȱdehydrationȱofȱbothȱcoatedȱandȱuncoatedȱ
samples.ȱWaterȱlossȱofȱcoatedȱsamplesȱwasȱmoreȱthanȱtheȱuncoatedȱsamplesȱinȱcoatingȱsolutionȱofȱ0.5ȱ
toȱ3%ȱconcentrationȱwhereasȱsolidȱgainȱofȱcoatedȱsamplesȱwasȱlessȱthanȱtheȱuncoatedȱsamplesȱatȱallȱtheȱ
concentrationsȱofȱcoatingȱsolution.ȱIncreaseȱinȱdryingȱtimeȱledȱtoȱdecreaseȱinȱbothȱwaterȱlossȱandȱsolidȱ
gain.ȱPRȱvaluesȱincreasedȱasȱtheȱconcentrationȱofȱcoatingȱagentȱincreasedȱfromȱ0.5ȱtoȱ1%ȱandȱfurtherȱ
increaseȱinȱtheȱconcentrationȱaboveȱ1%ȱresultedȱinȱdecreasedȱPR.ȱTheȱhighestȱvalueȱofȱperformanceȱratioȱ
ofȱ5.89ȱwasȱobservedȱinȱsamplesȱdippedȱinȱcoatingȱsolutionȱofȱ1%ȱconcentrationȱforȱ120ȱsȱfollowedȱbyȱ
ovenȱdryingȱforȱ40ȱmin.
Highlights
  • ȱ Cutȱ pineappleȱ samplesȱ wereȱ coatedȱ withȱ pectinȱ atȱ differentȱ concentrationsȱ andȱ thenȱ osmoticȱ
    • dehydrationȱwasȱcarriedȱout.
  • ȱ Coatingȱprovedȱtoȱbeȱanȱeffectiveȱmethodȱtoȱcheckȱtransferȱofȱsolidȱgainȱwithoutȱaffectingȱwaterȱ
    • removalȱduringȱosmoticȱdehydration.
  • ȱ Highestȱ performanceȱ ratioȱ wasȱ observedȱ atȱ 1%ȱ concentrationȱ ofȱ pectinȱ asȱ comparedȱ toȱ otherȱ
    • concentrations.
    Keywords: ȱOsmoticȱdehydration,ȱcoatings,ȱpineapple,ȱmassȱtransfer,ȱpectin,ȱperformanceȱratio
    Osmoticȱdehydrationȱ(OD)ȱisȱoneȱofȱtheȱpreservationȱ tissueȱandȱtheȱosmoticȱsolution,ȱtwoȱcounterȱcurrentȱ
    methods,ȱwhichȱisȱwidelyȱusedȱforȱpartialȱremovalȱofȱ massȱ transfersȱ takeȱ place:ȱ (1)ȱ diffusionȱ ofȱ waterȱ
    waterȱfromȱfoodȱmaterials.ȱThisȱprocessȱmainlyȱdealsȱ outȱofȱtheȱcellsȱintoȱtheȱsolutionȱandȱ(2)ȱuptakeȱofȱ
    withȱtheȱremovalȱofȱwaterȱfromȱfoodȱbyȱimmersingȱ soluteȱbyȱcellularȱtissuesȱfromȱtheȱosmoticȱsolutionȱ
    theȱfoodȱmaterialȱinȱanȱosmoticȱsolution.ȱForȱosmoticȱ (Houghȱ et al .ȱ 1993;ȱ Jenaȱ andȱ Dasȱ 2005;ȱ Lazaridesȱ
    treatment,ȱ foodȱ materialȱ isȱ introducedȱ intoȱ anȱ et al .ȱ1997;ȱRaoult-Wackȱ et al .ȱ1994;ȱSinghȱ et al .ȱ2010;ȱ
    aqueousȱ solutionȱ ofȱ increasedȱ osmoticȱ pressure.ȱ Waliszewskiȱ et al. 2002).ȱPineappleȱ( Ananas comosus )ȱ
    Duringȱ OD,ȱ dueȱ toȱ differenceȱ inȱ concentrationȱ ofȱ isȱrichȱinȱminerals,ȱhaveȱhighȱcontentȱofȱvitaminsȱandȱ
    dissolvedȱ substancesȱ inȱ theȱ cellȱ fluidȱ withinȱ theȱ excellentȱ sourceȱ ofȱ bromelain,ȱ anȱ enzyme,ȱ usedȱ asȱ