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《Food Control》2015
Immunochromatographic assays (ICAs) are considered as a suitable diagnostic tool for the detection of mycotoxins. Mycotoxins and especially, ochratoxin A are analytes with more demanding sensitivity requirements. To enhance the sensitivity of current immunochromatographic assays for ochratoxin A (OTA), a novel sensitive ICA was developed in this study. In the assay, microspheres enclosing fluorescent europium (III) [Eu(III)] nanoparticles (EuNPs) were used as a label for OTA monoclonal antibody (OTA-mAb) conjugation. Accordingly, assay was called time-resolved fluorescent immunochromatographic assay (TRFICA). The test strip was composed of three parts: a sample pad, nitrocellulose membrane and an absorbent pad. As for detection, a proper concentration of conjugated microspheres was pipetted into the microtube and sample extract was added to it. Then the strip was inserted into the tube and the fluid flow along the strip. The TRFICA results were obtained in 8 min and read by a portable TRFICA strip reader. The established method allows quantitative determination of OTA with limit of detection as low as 1.0 μg kg−1 in the samples. For validation, spiked samples including wheat, maize, soybean and rice were respectively assayed by TRFICA and a standard high performance liquid chromatography equipped with a fluorescence detector (HPLC-FLD), and good agreement of results was obtained between two methods. 相似文献
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《Food Control》2017
Sesame oil is one of the most valuable oil due to its bioactive properties, unique taste, odor, and flavor. Therefore, consumers tend to consume and willing to pay a higher price for sesame oil due to increasing awareness of consuming healthier and better food. However, sesame oil is subjected to adulteration risks with lower price vegetable oils which impairs consumer rights and human health. In this study, we purposed an ATR-FTIR based method for the rapid detection of food adulteration in sesame oil. For this purpose, sesame oil was adulterated with hazelnut, canola, and sun flower oils in different concentrations ranged from 1 to 50%. Cluster analysis of FTIR spectra was performed for differentiation and classification of pure sesame oil from adultured vegetable oil samples. In addition, a calibration curve was obtained to determine relationship between actual adulterant concentration and FTIR predicted concentrations using partial least square (PLS) method for each oil samples. According to these results, it could be concluded that ATR-FTIR technique has a potential for adulteration of sesame oil as a non-destructive, rapid, and effective alternative method. 相似文献
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《Food chemistry》2005,91(4):731-736
This research was carried out to determine the effect of fractionation temperature on the physicochemical characteristics of refined, bleached and deodorized (RBD) palm oil and sunflower oil blends fractionated at different temperatures. Blends of 20% and 40% sunflower oil with 80% and 60% RBD palm oil, respectively, were fractionated at three different temperatures (15, 18 and 21 °C). The results showed that olein with higher iodine value was obtained at lower fractionation temperature. This was because, at lower fractionation temperature, more of the polyunsaturated fatty acid, namely linoleic acid (C18:2), went into the liquid fraction. On the other hand, more of the saturated fatty acid, namely palmitic acid (C16:0), went into the liquid fraction at higher fractionation temperature. Blending reduced the triacylglycerol composition, namely POP, POS, SOO and PLP, while OLO, PLL, OLL and LLL/LLnO increased. Lower fractionation temperature decreased the composition of monosaturated triacylglycerol and increased the composition of di- and polyunsaturated triacylglycerols. Lower fractionation temperature produced a liquid fraction with lower solid fat content and lower cloud point than did higher fractionation temperature. 相似文献
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