分别将2.5%、5.0%、7.5%和10.0%的大豆分离蛋白(SPI)和淀粉添加于猪肉中,采用UHPLC-MS/MS法测定其中16种杂环胺的含量,探讨其对杂环胺形成的影响。结果表明:添加2.5%的SPI和淀粉后,除喹喔啉类(Me IQx和4,8-Di Me IQx)外,各杂环胺的含量...分别将2.5%、5.0%、7.5%和10.0%的大豆分离蛋白(SPI)和淀粉添加于猪肉中,采用UHPLC-MS/MS法测定其中16种杂环胺的含量,探讨其对杂环胺形成的影响。结果表明:添加2.5%的SPI和淀粉后,除喹喔啉类(Me IQx和4,8-Di Me IQx)外,各杂环胺的含量均显著增加(p<0.05)。随着添加量的增加,杂环胺的含量先升高后开始下降。当添加量达到10.0%时,SPI的添加对4,8-Di Me IQx的形成出现显著抑制作用(p<0.05),而淀粉的添加对吡啶和喹啉/喹喔啉杂环胺的促进作用则变得不再显著(p<0.05)。由此可见,SPI和淀粉的添加对烤猪肉体系中多数杂环胺的形成具有低剂量促进,且随着剂量的增多促进效果逐渐减弱的影响规律。展开更多
Reverse flotation studies on magnetite samples have revealed that the use of starch as a depressant of Fe-oxides has a hydrophilic effect on the surface of Fe-bearing silicates and significantly decreases Fe in the si...Reverse flotation studies on magnetite samples have revealed that the use of starch as a depressant of Fe-oxides has a hydrophilic effect on the surface of Fe-bearing silicates and significantly decreases Fe in the silica-rich stream when used in combination with an amine （Lilaflot D817M）. In this study, the effect of reverse flotation on the optimization of products obtained fi＇om magnetic separation was inves- tigated. Two different magnetic samples, zones 1 and 2, were milled to 〈75 btm and then subjected to low intensity magnetic separation （LIMS）. The LIMS test conducted on the 〈75 ~m shown an upgrade of 46.40wt% Fe, 28.40wt% SiO2 and 2.61wt% MnO for zone 1 and 47.60wt% Fe, 29.17wt% SiO2 and 0.50wt% MnO for zone 2. Further milling of the ore to 〈25 ~tm resulted in a higher magnetic-rich product after magnetic separation. Reverse flotation tests were conducted on the agitated magnetic concentrate feed, and the result shows a significant upgrade of Fe compared to that obtained from the non-agitated feed. Iron concentrations greater than 69%, and SiO2 concentrations less than 2% with overall magnetite recoveries greater than 67% and 71% were obtained for zones 1 and 2, respectively.展开更多
文摘分别将2.5%、5.0%、7.5%和10.0%的大豆分离蛋白(SPI)和淀粉添加于猪肉中,采用UHPLC-MS/MS法测定其中16种杂环胺的含量,探讨其对杂环胺形成的影响。结果表明:添加2.5%的SPI和淀粉后,除喹喔啉类(Me IQx和4,8-Di Me IQx)外,各杂环胺的含量均显著增加(p<0.05)。随着添加量的增加,杂环胺的含量先升高后开始下降。当添加量达到10.0%时,SPI的添加对4,8-Di Me IQx的形成出现显著抑制作用(p<0.05),而淀粉的添加对吡啶和喹啉/喹喔啉杂环胺的促进作用则变得不再显著(p<0.05)。由此可见,SPI和淀粉的添加对烤猪肉体系中多数杂环胺的形成具有低剂量促进,且随着剂量的增多促进效果逐渐减弱的影响规律。
基金the financial assistance of the National Research Foundation(NRF)University of the Witwatersrand,Johannesburg,South Africa
文摘Reverse flotation studies on magnetite samples have revealed that the use of starch as a depressant of Fe-oxides has a hydrophilic effect on the surface of Fe-bearing silicates and significantly decreases Fe in the silica-rich stream when used in combination with an amine （Lilaflot D817M）. In this study, the effect of reverse flotation on the optimization of products obtained fi＇om magnetic separation was inves- tigated. Two different magnetic samples, zones 1 and 2, were milled to 〈75 btm and then subjected to low intensity magnetic separation （LIMS）. The LIMS test conducted on the 〈75 ~m shown an upgrade of 46.40wt% Fe, 28.40wt% SiO2 and 2.61wt% MnO for zone 1 and 47.60wt% Fe, 29.17wt% SiO2 and 0.50wt% MnO for zone 2. Further milling of the ore to 〈25 ~tm resulted in a higher magnetic-rich product after magnetic separation. Reverse flotation tests were conducted on the agitated magnetic concentrate feed, and the result shows a significant upgrade of Fe compared to that obtained from the non-agitated feed. Iron concentrations greater than 69%, and SiO2 concentrations less than 2% with overall magnetite recoveries greater than 67% and 71% were obtained for zones 1 and 2, respectively.
