{"title":"Effects of Pre-Heating and Concentration Temperatures on Physico-Chemical Quality of Semi Concentrated Tomato (Solanum lycopersicum) Paste","authors":"Y. Hassen, Habtamu Gebre, A. Haile","doi":"10.4172/2157-7110.1000795","DOIUrl":null,"url":null,"abstract":"Fresh tomato is one of the fruits with a short shelf life. The purpose of this study was to evaluate the effects of pre-heating and concentration temperatures on the physicochemical and microbiological quality attributes of semi-concentrated tomato paste. Breaking temperatures of 60°C, 70°C and 90°C for 7 min and concentration temperatures of 80°C and 90°C were used to prepare semi tomato paste of 13-degree Brix of Total Soluble Solids (TSS). TSS, titratable acidity, pH, lycopene, vitamin C, viscosity were determined following standard methods. Increasing breaking temperature and concentration temperatures significantly (p<0.05) increased TSS, viscosity, and lycopene content, but reduced significantly (p<0.05) vitamin C content. The hot broken tomato at 90°C and concentrated at 90°C caused a significant reduction of vitamin C content (44% loss) as compared to the other treatments of tomato paste samples but greater product consistency (gross viscosity) and higher lycopene content. Processing conditions have a great influence on the overall quality of the final product. The breaking process at 70°C and concentrating at 80°C shown good viscosity and better retention of vitamin C. Therefore, breaking at 70°C and concentrating at 80°C can be adopted for commercial production of tomato paste.","PeriodicalId":15727,"journal":{"name":"Journal of Food Processing and Technology","volume":"10 1","pages":"1-6"},"PeriodicalIF":0.0000,"publicationDate":"2019-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Food Processing and Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4172/2157-7110.1000795","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
Fresh tomato is one of the fruits with a short shelf life. The purpose of this study was to evaluate the effects of pre-heating and concentration temperatures on the physicochemical and microbiological quality attributes of semi-concentrated tomato paste. Breaking temperatures of 60°C, 70°C and 90°C for 7 min and concentration temperatures of 80°C and 90°C were used to prepare semi tomato paste of 13-degree Brix of Total Soluble Solids (TSS). TSS, titratable acidity, pH, lycopene, vitamin C, viscosity were determined following standard methods. Increasing breaking temperature and concentration temperatures significantly (p<0.05) increased TSS, viscosity, and lycopene content, but reduced significantly (p<0.05) vitamin C content. The hot broken tomato at 90°C and concentrated at 90°C caused a significant reduction of vitamin C content (44% loss) as compared to the other treatments of tomato paste samples but greater product consistency (gross viscosity) and higher lycopene content. Processing conditions have a great influence on the overall quality of the final product. The breaking process at 70°C and concentrating at 80°C shown good viscosity and better retention of vitamin C. Therefore, breaking at 70°C and concentrating at 80°C can be adopted for commercial production of tomato paste.