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Monitoring of the tin release to the canned fruit from the used packaging
Flajs, Roman ; Vránová, Dana (referee) ; Diviš, Pavel (advisor)
This master’s thesis deals with the issue of the release of tin in canned fruit of used packaging. The theoretical part of the thesis is described canning fruit as raw material, its composition, methods of preservation, basic technological operations fruit processing, manufacture of compote, manufacture of metal packaging, marches corrosive metal packaging, chemical behavior of tin in foods and toxicity, methods for the determination of tin in foods with a focus on optical emission spectrometry with inductively coupled plasma. I the experimental part of the thesis was first ICP-OES optimized before to analysis of the 20 different samples compote purchased in chain stores. Tin concentration was determined by a fixed proportion compote. Measured concentration of tin were compared with the maximum permissible value in canned foods, which is allowed by European legislation. The tin content in all analyzed compote did not exceed the legislative limit of 200 mg/kg. The highest concentration of tin has been measured in sample conserved apricots namely 88,6 ± 2,8 mg/kg.
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Monitoring of the tin release to the canned fruit from the used packaging
Flajs, Roman ; Vránová, Dana (referee) ; Diviš, Pavel (advisor)
This master’s thesis deals with the issue of the release of tin in canned fruit of used packaging. The theoretical part of the thesis is described canning fruit as raw material, its composition, methods of preservation, basic technological operations fruit processing, manufacture of compote, manufacture of metal packaging, marches corrosive metal packaging, chemical behavior of tin in foods and toxicity, methods for the determination of tin in foods with a focus on optical emission spectrometry with inductively coupled plasma. I the experimental part of the thesis was first ICP-OES optimized before to analysis of the 20 different samples compote purchased in chain stores. Tin concentration was determined by a fixed proportion compote. Measured concentration of tin were compared with the maximum permissible value in canned foods, which is allowed by European legislation. The tin content in all analyzed compote did not exceed the legislative limit of 200 mg/kg. The highest concentration of tin has been measured in sample conserved apricots namely 88,6 ± 2,8 mg/kg.
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Determination of tin in canned fruits
Šťávová, Elena ; Hrstka, Miroslav (referee) ; Diviš, Pavel (advisor)
This bachelor’s thesis deals with determination of tin in canned fruits. Fruit processing, manufactory of compotes, manufactory of metal packaging products, corrosion of cans, chemical behaviour of tin in food, its potential toxicity, possibilities for the determination of tin in food and characterization of inductively coupled plasma optical emission spectrometry are described in theoretical part. In experimental part, ICP-OES technique was firstly optimized and then 28 different compotes purchased at common stores were analysed. The concentration of tin was determined only in fruit juice due to the easier sample preparation, even though quantity of tin in the solid part and in the juice can differ. However, the difference is not too big. Measured concentrations of tin were compared with the maximum permissible level of tin in canned food determined by European legislation. None of them exceed the 200 mg/kg level. When processing the results, it was found that the coating of the can has a significant influence on the content of tin in canned fruits. Concentrations of tin in laquered cans were significantly lower than in unlaquered cans.
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