Identification And Control Of Oil Rancid Flavor Signature Ingredients In Baby Accessories

Infants complementary food supplement,be referred as nutrition package,is a supplement to a variety of micronutrients with 6 to 36 months of infants and young children,rich in nutritional value and high fat content,and have a good effect of prevent infants and young children anemia,growth retardation,low weight and other malnutrition symptoms.In 2012,the National Health Commission in conjunction with the National Women's Federation jointly launched children's nutrition improvement program in poverty-stricken areas have achieving good results.Chapter 1: Introduce the research background and the significance of the nutrition packages.According to the specific requirements of the nutrient packages and the production process,summarizing the composition and characteristics of the nutritional packages,and anaylsising the mechanism of the fat oxidation in the nutrient packages and the important influencing factors.Chapter 2: In order to study the oxidative stability of infants nutrient packages,accelerated oxidation experiments with not have nitrogen filling infants nutrient packages,and regular detacted the changes of acid value,peroxide value,carbonyl value and sensory evaluation,at the same time,the changes of the components of the infants nutrition packages was be detected by UPLC-QTOF-MS.The results show that infants nutrition packages have oil rancid odor in accelerated oxidation of the first 5 days,with the increase in accelerated oxidation time,acid value,peroxide value,carbonyl value showed a first rise and then decline.The use of UPLC-QTOF /MS technology to detect infants nutrient packages in different accelerated oxidation of chemical substances not have changed.Chapter 3: In order to study the main components of oil rancid odor in infants nutrient packages,accelerated oxidation experiments with not have nitrogen filling infants nutrient packages,The headspace solid phase microextraction(HS-SPME)and static headspace(SHS)was used to extract the volatile components from the samples and analyzed by gas chromatography-mass spectrometry(GC-MS).Combined with principal component analysis,the results show that(E)-2-heptenal,nonanal,trans-2-nonenal,1-(2-furyl)-2-butanone are the main contributor flavors in infants nutrient packages,infants nutrition packages have oil rancid odor in accelerated oxidation of the first 5 days,Hexanaldehyde,(E,E)-2,4-nonadienal,2,6-di-tert-butylbenzoquinone,and dinonyl lactone are the main contributors flavors.At 10 days after accelerated oxidation,Isoamyl alcohol,1,4-cyclooctadiene,(2E,4E)-2,4-decadienyl alcohol,di-n-amyl ketone,and cardamomol are the main contributors flavors.At 15/20/25 days after accelerated oxidation,Trans-2-octenal,trans-2,4-decadienal,trans-2-hexenal,heptaldehyde,2-undecenal,3-nonen-2-one,(E,E)-2,4-nonadienal,trans-2,4-decadienal,cyclobutanoate,6-ethyl-3-octyl are the main contributors flavors.Chapter 4: In order to study the effects of different calcium and iron fortifiers on the stability of infants nutrient packages,There are five kinds of calcium iron fortifiers was commonly used in the market were been selected to mixed with other raw materials to simulate the formulas.After the accelerated oxidation test,the samples were extracted by headspace solid phase microextraction(HS-SPME).The volatile components in the samples were identified by gas chromatography-mass spectrometry(GC-MS),and supplemented by human sensory evaluation of the changes odor in the infants nutrient packages to determine the different types of calcium and iron fortifiers' stability.Combined with the principal component analysis,the results show that the human body sensory evaluation of have added calcium carbonate or Iron pyrophosphate fortifiers formulations are around the oxidation time have oil rancid odor.The addition of calcium carbonate formulations are have obvious changes in volatile components,and different with other recipe groups.Chapter 5: In order to study the effects of different processing techniques,packaging methods and microencapsulation on the oil rancid odor of infants nutrient packages,the accelerated oxidation experiments was carried out without nitrogen dry processing,no nitrogen wet processing,nitrogen dry processing,calcium and iron microencapsulation,and samples were extracted by headspace solid phase microextraction(HS-SPME).The volatile components in the samples were identified by gas chromatography-mass spectrometry(GC-MS).Combined with the principalcomponent analysis,the results show that without nitrogen dry sample have significantly different with other groups after the accelerated oxidation,no nitrogen wet sample have slight change after the accelerated oxidation,microencapsulation sample have significantly different with other groups.nitrogen dry sample have no change in odor after accelerated oxidation.The nitrogen dry process have a good effect on the control the oil rancid flover.