|
|
Determination of nitrates in vegetables by capillary izotachophoresis
Jančová, Nikola ; Zlámalová Gargošová, Helena (referee) ; Řezáčová, Veronika (advisor)
This bachelor thesis deals with determination of nitrates in vegetables employing the capillary isotachophoresis technique. The literature review is devoted to occurrence of nitrates in vegetables, their health risks, the influence of food processing onto nitrate content, commonly used methods of determination as well as the capillary isotachophoresis and its practical application. Experimental part focuses on the application of capillary isotachophoresis for determination of nitrate content in vegetables obtained from conventional agriculture and organic farming.
|
|
|
Vegetable processing and production of ketchup
Popelová, Nikola ; Valicová, Markéta (referee) ; Omelková, Jiřina (advisor)
The aim of the theoretical part of this bachelor thesis is describe vegetable processing and production of ketchup. The experimental part is divided into two parts. In the first part ketchup was subjected to the chemical analysis. Batches of ketchups were taken. Refraction, salt content, acid content, pH, colour and consistency were measured in those batches. In the second part the microbiological analysis was performed in products which were bought in a shop. The microbiological analysis included determination of the microbiological sanitariness of the final product, effect of ambient temperature on storage ketchup, contamination of the final product by microorganisms and effect of the final product on the growth of selected microorganisms. Results obtained by laboratory analysis suited required values and confirmed the quality of raw material and good manufacturing and laboratory practices.
|
|
|
Sample preparation for DNA analysis from foods of plant origin
Silná, Renata ; Rittich, Bohuslav (referee) ; Kovařík, Aleš (advisor)
The isolation of high quality DNA is nessecary for many molecular biology applications. However, plant DNA contains high amonts of polysaccharides, polyphenols and various secondary metabolites, which decrease yield and quality of isolated DNA. The aim of this study was preparation of samples and different food matrices for DNA isolation DNA by magnetic particles. It was about 5 species of vegetable and 10 species of processed plant food. Homogenization of samples was performed in CTAB buffer. Isolation of plant DNA was performed by magnetic particles covered with carboxyl groups. All DNAs were isolated in conventional PCR qualities using primers for 700 bp amplicons, in the case of heat processed products for 220 bp ampilicons and for real time PCR. The efficiancy of separation of magnetic particles with DNA by magnetic separator and magnetic needle was compared. It was find out that DNA of higher purity was isolated using magnetic needle. The micromethod of isolation of plant DNA from homogenates with CTAB with magnetic particles is suitable for different processed food.
|
|
|
Design of juicer
Michalicová, Anežka ; Rubínová, Dana (referee) ; Tomášková, Veronika (advisor)
This bachelor's thesis deals with the analysis and afterwards design of a juicer. First part is devoted to an overview of the history of juicers then it continues in technical analysis of the product and further analysis of juicers available on the current market. Following chapters focus on my specific design proposal and the solutions it delivers. The output of the thesis is textual analysis, mock-up model and a poster.
|
|
|
Návrh automatizovaného hydroponického systému
Dvořáková, Kateřina
The thesis deals with hydroponic systems and their automation. The aim is to design and test an automated hydroponic system for growing vegetables in laboratory conditions. The thesis is divided into theoretical and practical parts. In the theoretical part, all available methods of hydroponic systems are analyzed, in the practical part the procedure of designing and implementing a specific automated hydroponic system is described. The control was solved using a single-board and prototyping microcontroller Arduino. The construction was realized using material commonly available in retail chains. The advantages and disadvantages of the hydroponic system constructed in this way were determined, and above all, whether such an automated system can be implemented and properly used.
|
|
|
Metody nanášení hydrogelů na povrch ovoce a zeleniny
Hrabová, Martina
The aim of this thesis was to develop a methodology for applying biopolymer mixtures directly onto the surface of selected fresh foods, fruits and vegetables, and to evaluate the prospects of biopolymer mixtures based on egg white. The theoretical part of this thesis outlines the issue of the packaging industry and the causes of food spoilage. Furthermore, methods for the application of biopolymeric coatings and films on a laboratory scale are described and natural polymers are summarized. In the experimental part of the thesis, the most suitable coating mixture was selected regarding the evaluation of strawberry and cucumber samples’ coating made of different biopolymeric mixtures. For this coating mixture, the samples of fruit and vegetable were subjected to analysis by near infrared spectroscopy.
|
|
| |
|
| |
|
| |
|
|
Fruits and vegetables as sources of fiber and minerals in the school systém.
ZDENĚK, Filip
From research on the effects of diet rich in vegetables and fruits comes convincing evidence of its benefits for human health and contribution to the prevention and fight against NCDs. Based on the knowledge about the importance of proper nutrition, efforts are being made to create suitable eating habits in children during the school attending period. The aim of this thesis is to find out whether the state of consumption of fruit and vegetables (2018-2020) in the practice of the school canteen corresponds to the nutritional standards. Another goal is to determine the average representation of fibre in one lunch among diners 7-14 years of age and to evaluate whether it corresponds to adequate intake according to EFSA. Using secondary analysis, data from collected consumption baskets at the selected school canteen were processed. Gathered values were statistically tested to evaluate the hypothesis of compliance or non-compliance with the norms.
|
guest ::
