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Marica Consolini Michela Sega Chiara Zanetti Marina Fusi Roberto Chignola Marco De Carli Corrado Rizzi Gianni Zoccatelli 《Food Analytical Methods》2012,5(2):234-243
Wheat α-amylase inhibitors (α-AIs) are known anti-nutritional factors, respiratory allergens, and they can sporadically cause
food allergy. α-AIs are therefore expected to reach the enteric mucosae in an immunologically active form, but information
on their stability to gastric digestion is not available. Resistance to pepsinolysis is nonetheless a key factor for any food
allergen. We therefore investigated whether α-AIs could resist pepsin digestion in simulated gastric fluids (SGF) and in emulsified
SGF, the latter simulating more realistically the multi-phase nature of stomach bolus. Since α-AIs comprise a huge family
of proteins, we investigated 0.19 α-AI as a prominent member. The digestion patterns were analyzed by immunoblotting using
anti-0.19 polyclonal antibodies and sera from wheat allergic patients sensitized to 0.19 α-AI. The results show that the immune
epitopes of α-AI are detectable up to 120 min of digestion in emulsifying conditions. Intra-molecular disulfide bonds and,
in particular, emulsification were found to be crucial factors for protein stability. The results show that 0.19 α-AI must
be considered a potential food allergen. 相似文献
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The presence of antibiotic residues in raw milk is a big threat not only to the dairy industry but also to public health. Therefore, it is very important to detect antibiotic residues in raw milk. There are many reliable antibiotic test used in dairy laboratories. Unfortunately, some factors can affect the results causing, so-called false-positive results. The aims of this paper are to check the detection limits of microbiological inhibitor test with test organisms Geobacillus stearothermophilus var. calidolactis, which are provided on Delvotest® Accelerator instrument (DSM, The Netherlands) for antibiotics amoxicillin and oxytetracycline and to examine the influence of variations of milk fat contents, pH values and azidiol concentrations in raw milk on detection limits, e.g., test results. The obtained results showed that detection limit for amoxicillin is 3 μg/L and oxytetracycline 250 μg/L; concentration of preservative azidiol of 0.1 mL per 40 mL of milk does not affect the detection limits of the test; microbiological inhibitor test is extremely sensitive to low pH value of samples so, it is recommended to avoid testing milk samples with low pH value, or to adjust the sample’s pH value by addition of some base; and that fat content in raw milk up to 5 % does not affect the detection limit of the methods for amoxicillin and for oxytetracycline. 相似文献