排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
The contamination of animal feed with mycotoxins represents a worldwide problem for the animal industry. The most applied
method for protecting animals against aflatoxicosis is the utilization of clay minerals. In the course of a research project
adsorption experiments were performed in buffer solutions in order to evaluate the ability to bind Aflatoxin B1 (AfB1) at various pH-values. In order to investigate the strength of binding, the chemisorption index was calculated. Isothermal
analysis was used to determine the values for the maximum adsorption capacity. Adsorption experiments in simulated gastrointestinal
fluid and real gastric juice were carried out. Furthermore binding capability of the materials regarding selected vitamins
was examined. Special attention was paid to the formation of AfB2a during experimental conditions. Based on the obtainedin vitro results, highly promising sorbent materials were ranked for furtherin vivo studies. Some adsorbing bentonites were also analysed mineralogically, but the results did not indicate which smectite property
influences the adsorption process for AfB1
Presented at the 28th Mykotoxin-Workshop, Bydgoszcz, Poland, May 29–31, 2006
Financial support: Christian Doppler Society 相似文献
2.
Anin vitro study using single concentration and isotherm adsorption was carried out to evaluate the capacity of Vietnamese produced
zeolite and bentonite to adsorb aflatoxin B1 (AFB1) in simulated gastrointestinal fluids (SGFs), and a commercial sorbent hydrated sodium calcium aluminosilicate (HSCAS) was
used as reference. In this study, AFB1 solution was mixed with sorbents (0.3, 0.4 and 0.5% w/v) in SGFs at pH 3 and pH 7 and shaken for 8 h, centrifuged and the
supernatant measured by Vicam fluorometer. Adsorption of AFB1 onto zeolite and bentonite varied according to the pH of SGFs and was lower than HSCAS. Linearity between the increased amount
of AFB1 adsorbed on sorbents and the decrease of sorbent concentration was observed for bentonite and HSCAS, except for zeolite in
SGFs at pH 7. The observed maximum amounts of AFB1 adsorbed on bentonite and HSCAS were 1.54 and 1.56 mg/g, respectively. The adsorption capacities of bentonite and HSCAS for
AFB1 were 12.7 and 13.1 mg/g, respectively, from fitting the data to the Freundlich isotherm equation. Improvement in processing
and purification for bentonite is needed to enhance the surface area, which would probably result in better adsorptive capacity
for this sorbent. 相似文献
3.
In an in vitro experiment, aluminosilicates (Atox® and Novasil™ Plus) and a yeast cell wall derivate (Mycosorb®) were used as sequestering agents (SAs) to verify their capacity for binding aflatoxin B1 (AFB1) in vitro. SAs were individually mixed at three different ratios with AFB1 (1:5000, 1:50,000 and 1:500,000, w/w) in water (CTR), rumen fluid from a lactating cow with a low rumen pH (LRS) or rumen fluid from a dry cow with a high rumen pH (HRS), and then used in a 3 × 3 × 3 factorial arrangement of a completely randomized design. At the 1:500,000 AF:SA ratio Atox® and Novasil™ Plus sequestered over 0.87 and 0.98 of the AFB1 in the CTR and rumen solutions (LRS and HRS), respectively. This efficacy decreased when the amount of clays was reduced, with higher values (P<0.001) for Atox® compared with Novasil™ Plus (0.50 vs. 0.28 in CTR; 0.58 vs. 0.16 in LRS and 0.44 vs. 0.27 in HRS). Mycosorb® had a lower sequestering efficacy (P<0.001) in all of tested experimental conditions, with 0.34 being the maximum value obtained in the CTR solution. 相似文献
1