Monika Sabolová

Vitamin E has only relatively mild manifestations of hypovitaminosis in humans, which, moreover, are not, in most cases, caused by insufficient content of tocopherols in the diet. Thus, the fact that the actual intake of vitamin E is (worldwide) insufficient in the majority of the population is likely to escape the attention of nutrition policy. This review summarizes current information on the recommended and actual intake of vitamin E and on the risks and possible benefits associated with insufficient or increased intake. Vitamin E má u člověka jen relativně mírné projevy hypovitaminózy, které navíc nejsou, ve většině případů, způsobeny nedostatečným obsahem tokoferolů ve stravě. Pozornosti výživové politiky tak pravděpodobně uniká fakt, že skutečný příjem vitaminu E je u většiny populace (celosvětově) nedostatečný. Tento přehled shrnuje aktuální informace o doporučeném a reálnem příjmu vitaminu E a o rizicích a případných benefitech spojených s jeho nedostatečným či zvýšeným příjmem.

Nutritional interventions play a vital role in treating gout, and knowledge of the purine content in foods is essential. Because edible insects have been proposed as mini-livestock alternatives, this study aimed to analyse the content of purines (adenine, guanine, xanthine, and hypoxanthine) and their metabolite (uric acid) in two different developmental stages of six insects (Tenebrio molitor, Alphitobius diaperinus, Gryllus assimilis, Acheta domesticus, Locusta migratoria, and Blaberus discoidalis) and meats (chicken, pork, beef, and salmon). Compared to meat, edible insects contained equivalent or higher amounts of total purine (3.23-13.22 g/kg edible insect dry matter vs 3.61-5.53 g/kg meat dry matter) and uricogenic purines adenine + hypoxanthine (1.55-8.86 g/kg edible insect dry matter vs 2.97- 4.91 g/kg meat dry matter). Although the uric acid content was significantly affected by the developmental stage and species, the total purine content did not vary within the stages. In conclusion, the tested insects are unsuitable for a low-purine diet.

Relationship between the fat and oil composition and their initial oxidation rate during storage | Monika Sabolová, Václav Zeman, Gabriela Lebedová, Marek Doležal, Josef Soukup, Zuzana Réblová | Agricultural Journals

Fruits and vegetables are the best food sources of vitamin C. However, fruits and vegetables can be also sources of potentially harmful substances to the human body, nitrates being one of these. The aim of this study was to compare vitamin C and nitrates contents in selected fruits and vegetables from supermarkets and local farmers' markets. Samples of plums, strawberries, apples, spinach, red peppers and tomatoes were chosen for analysis. Content of vitamin C and nitrates was analyzed by HPLC/DAD. The hypothesis was that local market fruits and vegetables contain more vitamin C and fewer nitrates than samples bought in supermarkets. Laboratory analyses showed that there were differences in vitamin C in the case of strawberries, tomatoes and red peppers. The highest level of ascorbic acid was in red pepper samples (141 mg.100g^-1). In the case of fruit, the highest content was in strawberries (70 mg.100g^-1). As far as nitrates content is concerned, in three cases out of six, the fruit and vegetables we tested from farmers' markets contained lower concentrations of nitrates than those purchased at supermarkets and the hypothesis was accepted in these cases. There was no significant difference between the nitrate content of the local market and supermarket strawberries and red peppers. Tomatoes had significantly higher nitrate content when purchased at farmers' markets than at supermarkets. Leafy vegetables are considered to be the major source of nitrates, and this was confirmed by this study. The highest content of nitrates was in the spinach sample (2969 mg.kg^-1). Among all fruit samples, strawberries had the highest nitrates levels (maximum 131 mg.kg^-1). The results of this work showed that the content of ascorbic acid and nitrates differs significantly depending on the type of fruit or vegetables.

Attitude of assessors in the Czech Republic to the consumption of house cricket Acheta domestica L. – A preliminary study | Lenka Kouřimská, Veronika Kotrbová, Martin Kulma, Anna Adámková, Jiří Mlček, Monika Sabolová, Dana Homolková | Agricultural Journals