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Background. Inulin is a storage carbohydrate found in many plants especially in chicory root, Jerusalem artichoke and dahlia tuber. It is a prebiotic with many functional properties. In earlier research conceming chemical stability of inulin, the effect of pH on rheological properties of inulin gels was mainly analysed. In these studies, the effect of time, temperature and pH on inulin chemical stability was not analysed profoundly especially considering the inulin concentrations unable to form gel structure. Thus, the aim of this work was to study the effect of the above mentioned factors on inulin chemical stability in water solution. Material and methods. 5% (w/w) inulin Solutions at pH 1-12 were heated at 20, 40, 60, 80 and 100°C for 5-60 min. After the neutralisation the content of reducing sugar was analysed according to Miller’s method (1959) with 3,5-dinitrosalicylic acid. Results. The conducted studies showed that inulin Chemical stability at pH < 4 decreased with an increase of heating time and temperature. In a neutral and basic environment inulin was chemically stable regardless of heating time and temperature. Conclusions. Inulin application in food systems may be limited in acidic products especially when heated above 60°C during the production process. However, in products at pH > 5, the degradation of this fructan does not occur even at thermal processing.
The aim of the study was to evaluate 4-nitrophenylarsonic acid efficacy (Histostat® 50; Alpharma Trade Inc., USA) and metronidazol (Avimetronid; Polfa Grodzisk) in preventing turkeys histomoniasis. 10 turkeys with histomoniasis disorder and 10 healthy 10-week old turkeys' were divided into three groups (I, II, III). Turkeys from group I were the control group. The turkeys from groups II and III were administered Avimetronid at a dose of 2.5 g/kg and Histostat® 50 at a dose of 0.37 g/kg in their feed for 5 weeks, respectively. Clinical observations, anatomopathological examinations, parasitological examinations of cloacae swabs as well as hematological (RBC, WBC, leukogram) and biochemical examinations (ALT, AST, LDH) of the blood were carried out before the experiment and in the 5th week of its duration. The results indicated that 4-nitrophenylarsonic acid is highly effective in preventing histomoniasis and that metronidazol also has therapeutic proprieties. Although no side effects were noted in the turkeys receiving the examined 4-nitrophenylarsonic acid, it nevertheless seems that there is a danger of arsenic compounds cumulating in turkeys' organisms.
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