蛋白营养食品卫生.pptx

ProteinJiangZhuoqin蒋卓勤

21、compositionofproteinC：50-55%H：6.7-7.3%O：19-24%N：13-19%（16%，6.25）onlyS：0-4%P、Fe、I、Mn、Zn。。。

AminoAcidPeptidePeptidebondDipeptideTripeptideOligopeptide:10AAPolypeptide:10AA

4AminoAcidNH2R-CHCOOH?-AminoAcid

（1）essentialaminoacid（2）conditionallyessentialaminoacid（semi-essentialaminoacid）（3）nonessentialaminoacid2、AminoAcid

AminoAcid:20注：组氨酸为婴儿必需氨基酸，成人需要量相对较少摘自：EllieWhitney,SharonRadyRolfes.UnderstandingNutrition[M].11thed.ThomsonWadsworth，2008:182

AminoacidpatternaminoacidpatternEAAlimitingaminoacidvegetablefood：lysine、methionine、threonine、tryptophanComplementaryactionofproteinReferenceprotein：eggprotein

2、FunctionsofProteinintheBodyCompositionofbodyLeantissue

2、Functionofprotein(2)Manufactureoffunctionalandregulatorysubstancesbloodprotein,enzyme,somehormones(3)energy4Kcal/g(3)Functionofspecialpeptides

103、Digestion，absorption,metabolismofproteinAADipeptideTripeptideAminoacidpoolObligatorynitrogenlosses(ONL)

nitrogenbalanceB=I－(U+F+S)

4、Nutritionalevaluationofprotein(1)ContentofproteinN：16%6.25Kjedahl

4、Nutritionalevaluationofprotein(1)Truedigestibility）(2)digestibility(2)Apparentdigestibility

(3)Utilizationofprotein1)Biologicalvalue(BV)

BVinmixeddietfoodBVMixed%millet6737---31ricoybean6416208ped4815------corn60---40---Driedbeef76------15MixedBV---747389

2)netproteinutilization(NPU)

3)proteinefficiencyratio(PER)

4)aminoacidscore(AAS)ThelowestscoreisthescoreoflimitingAAwhichistheAASoftheprotein.

AminoacidpatternandaminoacidscoreAminoacidpopulation（mg/gProtein）1y2~5y10~12yadultfood(mg/gprotein)Eggmilkbeefhistidine28--8soleucine70312810544748leucine161734414869581lysine103272212707889methionine+cysteine58272213573340phenylalanine+tyrosine1256927149310280t