Ara h 2是花生主要过敏原之一,为开发食物中Ara h 2过敏原成分的快速检测方法,减少因误食导致花生过敏事件的发生,该研究采用鼠源单克隆抗体作为捕获抗体、兔源多克隆抗体作为检测抗体,通过棋盘法优化抗体工作浓度,建立了一种检测花生...Ara h 2是花生主要过敏原之一,为开发食物中Ara h 2过敏原成分的快速检测方法,减少因误食导致花生过敏事件的发生,该研究采用鼠源单克隆抗体作为捕获抗体、兔源多克隆抗体作为检测抗体,通过棋盘法优化抗体工作浓度,建立了一种检测花生过敏原Ara h 2的间接双抗夹心化学发光酶免疫分析法,并对该方法的灵敏度、准确度、精密度和特异性进行评价。该方法的检出限为1.085 ng/mL,线性范围为3.12~200 ng/mL,添加回收率为78.30%~94.39%,批内和批间变异系数均小于10%,且特异性良好,与其他常见食物过敏原无交叉反应。该方法与相同抗体所建立的间接双抗夹心酶联免疫吸附测定(enzyme-linked immunosorbent assay, ELISA)方法相比,在灵敏度上表现出一定优势。该研究开发的化学发光酶免疫分析法可对花生食品生产过程中和消费前的Ara h 2过敏原成分检测提供可靠的技术支持。展开更多
This year marks the 20th anniversary of the China-Arab States Cooperation Forum(CASCF),and the tenth Ministerial Meeting of the CASCF was held in Beijing at the end of May,ushering in another highlight for China-Arab ...This year marks the 20th anniversary of the China-Arab States Cooperation Forum(CASCF),and the tenth Ministerial Meeting of the CASCF was held in Beijing at the end of May,ushering in another highlight for China-Arab cooperation.展开更多
目的:研制低致敏复合乳酸菌发酵花生乳。方法:利用试剂盒测定不同品种花生中的粗蛋白含量及Ara h 1含量,选取Ara h 1含量最低的花生品种制作发酵乳;以接菌量、接菌种类、发酵时间及糖添加量为考察因素,Ara h 1含量为测定结果,采用响应...目的:研制低致敏复合乳酸菌发酵花生乳。方法:利用试剂盒测定不同品种花生中的粗蛋白含量及Ara h 1含量,选取Ara h 1含量最低的花生品种制作发酵乳;以接菌量、接菌种类、发酵时间及糖添加量为考察因素,Ara h 1含量为测定结果,采用响应面法优化致敏蛋白Ara h 1含量下降最多的发酵花生乳制备工艺;制作复合益生菌发酵花生乳,并对产品的口感、组织状态和风味进行感官评价。结果:当接菌量为4%、接种嗜热链球菌和保加利亚乳杆菌、发酵4 h、糖添加量为6%时,发酵花生乳中的主要过敏原Ara h 1减少70%,含量为48μg/g,且感官评分达到80分。结论:经工艺优化获得了致敏蛋白Ara h 1含量低,凝乳效果好,口味怡人的复合益生菌发酵花生制品。展开更多
为探究湿热处理对花生球蛋白Ara h 3抗原性的影响,采用硫酸铵分级沉淀法从花生脱脂粉中分离纯化出Ara h 3,进行不同温度、时间和质量浓度的湿热处理,通过正交试验确定最优湿热处理条件,采用间接ELISA法检测湿热处理后Ara h 3抗原性变化...为探究湿热处理对花生球蛋白Ara h 3抗原性的影响,采用硫酸铵分级沉淀法从花生脱脂粉中分离纯化出Ara h 3,进行不同温度、时间和质量浓度的湿热处理,通过正交试验确定最优湿热处理条件,采用间接ELISA法检测湿热处理后Ara h 3抗原性变化,测定外源荧光、游离巯基含量以及圆二色光谱,从蛋白结构的变化解释湿热处理对Ara h 3抗原性的影响。研究表明:湿热处理能够降低Ara h 3抗原性,且在质量浓度10 mg/mL、90℃处理30 min时,抗原性降至最低;湿热处理后的Ara h 3荧光强度、表面疏水性增强,三级结构发生变化;游离巯基含量增加、空间结构发生改变;α-螺旋和β-折叠含量降低,无规则卷曲含量增加,二级结构发生变化。湿热处理后Ara h 3空间结构发生改变,部分抗原表位遭到破坏或被包埋,抗原性降低。展开更多
Little information was so far available about allergenic mechanism of the roasted peanut allergens during initial stages of allergy.The purpose of this study was to determine the influence of roasting(150℃,20 min)on ...Little information was so far available about allergenic mechanism of the roasted peanut allergens during initial stages of allergy.The purpose of this study was to determine the influence of roasting(150℃,20 min)on biochemical and biological properties of Ara h 3,a major peanut allergen.Allergenicity of roasted peanut emulsion to mice,differences in uptakes between Ara h 3 purified from raw peanuts(named as Ara h 3-Raw)and that purified from roasted peanuts(named as Ara h 3-Roasted)by bone marrow-derived dendritic cells(BMDCs)and the implication of cell surface receptors involving in uptake,and changes in glycosylation and structure of Ara h 3 after roasting were analyzed in this study.This study suggested that roasting increased allergenicity of peanut to BALB/c mice.Maillard reaction and structural changes of Ara h 3 induced by roasting significantly altered the uptake of Ara h 3-Roasted by BMDCs,and modified Ara h 3 fate in processes involved in immunogenicity and hyper allergenicity,indicating that food processing pattern can change food allergenicity.展开更多
以Ara h 3为免疫原免疫小鼠。选取血清效价高的小鼠再次免疫,制备出脾细胞后与骨髓瘤细胞一起进行细胞融合,得到杂交瘤细胞株,筛选阳性株制备大量单克隆抗体。通过酶联免疫吸附试验(ELISA)对制备的单克隆抗体进行效价测定、敏感性测定...以Ara h 3为免疫原免疫小鼠。选取血清效价高的小鼠再次免疫,制备出脾细胞后与骨髓瘤细胞一起进行细胞融合,得到杂交瘤细胞株,筛选阳性株制备大量单克隆抗体。通过酶联免疫吸附试验(ELISA)对制备的单克隆抗体进行效价测定、敏感性测定和特异性测定。通过蛋白质免疫印迹试验进一步验证其特异性。结果表明:免疫性较好的4B2单克隆抗体经纯化后的效价为1∶5.12×10^(5)。由敏感性测定得知4B2单克隆抗体的半抑制浓度(IC_(50))为389 ng/mL,证明其具有较好的敏感性,交叉反应率小于0.5%,成功制备出纯度高、效价高、敏感性好、特异性强的Ara h 3鼠源单克隆抗体,为建立免疫学快速检测方法奠定了基础。展开更多
China-Arab States Tour Operators Conference of the Sixth China-Arab States Expo,co-hosted by the Ministry of Culture and Tourism and the People's Government of Ningxia Hui Autonomous Region,and organized by the Ne...China-Arab States Tour Operators Conference of the Sixth China-Arab States Expo,co-hosted by the Ministry of Culture and Tourism and the People's Government of Ningxia Hui Autonomous Region,and organized by the Network of International Culturalink Entities and the Department of Culture and Tourism of Ningxia Hui Autonomous Region..展开更多
Chinese President Xi Jinping made a trip to Saudi Arabia from December 7 to 10, during which Xi attended the first China-Arab States Summit and the China-Gulf Cooperation Council(GCC) Summit, held bilateral meetings w...Chinese President Xi Jinping made a trip to Saudi Arabia from December 7 to 10, during which Xi attended the first China-Arab States Summit and the China-Gulf Cooperation Council(GCC) Summit, held bilateral meetings with nearly 20 Arab leaders, and paid a state visit to Saudi Arabia.展开更多
To thrive in a world that is undergoing changes not seen in a century,China and Arab states must enhance solidarity and collaboration.CHINA and Arab states are all developing countries.Combined,they account for one-si...To thrive in a world that is undergoing changes not seen in a century,China and Arab states must enhance solidarity and collaboration.CHINA and Arab states are all developing countries.Combined,they account for one-sixth of the world’s land mass,one-fourth of the world’s population,and one-eighth of the world economy.展开更多
为高效分离纯化花生过敏原Ara h 6,通过脱脂、蛋白浸提、阴离子交换层析分离得到目的蛋白,并用十二烷基磺酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)、基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF/MS)及免疫印迹技术(Western blotting)对其...为高效分离纯化花生过敏原Ara h 6,通过脱脂、蛋白浸提、阴离子交换层析分离得到目的蛋白,并用十二烷基磺酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)、基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF/MS)及免疫印迹技术(Western blotting)对其进行鉴定。结果表明,该蛋白为花生过敏原Ara h 6,其分子质量约为15kD,纯度大于95%,得率为22.5%。该方法简单、高效,可为花生过敏的进一步研究提供实验材料。展开更多
文摘Ara h 2是花生主要过敏原之一,为开发食物中Ara h 2过敏原成分的快速检测方法,减少因误食导致花生过敏事件的发生,该研究采用鼠源单克隆抗体作为捕获抗体、兔源多克隆抗体作为检测抗体,通过棋盘法优化抗体工作浓度,建立了一种检测花生过敏原Ara h 2的间接双抗夹心化学发光酶免疫分析法,并对该方法的灵敏度、准确度、精密度和特异性进行评价。该方法的检出限为1.085 ng/mL,线性范围为3.12~200 ng/mL,添加回收率为78.30%~94.39%,批内和批间变异系数均小于10%,且特异性良好,与其他常见食物过敏原无交叉反应。该方法与相同抗体所建立的间接双抗夹心酶联免疫吸附测定(enzyme-linked immunosorbent assay, ELISA)方法相比,在灵敏度上表现出一定优势。该研究开发的化学发光酶免疫分析法可对花生食品生产过程中和消费前的Ara h 2过敏原成分检测提供可靠的技术支持。
文摘This year marks the 20th anniversary of the China-Arab States Cooperation Forum(CASCF),and the tenth Ministerial Meeting of the CASCF was held in Beijing at the end of May,ushering in another highlight for China-Arab cooperation.
文摘目的:研制低致敏复合乳酸菌发酵花生乳。方法:利用试剂盒测定不同品种花生中的粗蛋白含量及Ara h 1含量,选取Ara h 1含量最低的花生品种制作发酵乳;以接菌量、接菌种类、发酵时间及糖添加量为考察因素,Ara h 1含量为测定结果,采用响应面法优化致敏蛋白Ara h 1含量下降最多的发酵花生乳制备工艺;制作复合益生菌发酵花生乳,并对产品的口感、组织状态和风味进行感官评价。结果:当接菌量为4%、接种嗜热链球菌和保加利亚乳杆菌、发酵4 h、糖添加量为6%时,发酵花生乳中的主要过敏原Ara h 1减少70%,含量为48μg/g,且感官评分达到80分。结论:经工艺优化获得了致敏蛋白Ara h 1含量低,凝乳效果好,口味怡人的复合益生菌发酵花生制品。
文摘为探究湿热处理对花生球蛋白Ara h 3抗原性的影响,采用硫酸铵分级沉淀法从花生脱脂粉中分离纯化出Ara h 3,进行不同温度、时间和质量浓度的湿热处理,通过正交试验确定最优湿热处理条件,采用间接ELISA法检测湿热处理后Ara h 3抗原性变化,测定外源荧光、游离巯基含量以及圆二色光谱,从蛋白结构的变化解释湿热处理对Ara h 3抗原性的影响。研究表明:湿热处理能够降低Ara h 3抗原性,且在质量浓度10 mg/mL、90℃处理30 min时,抗原性降至最低;湿热处理后的Ara h 3荧光强度、表面疏水性增强,三级结构发生变化;游离巯基含量增加、空间结构发生改变;α-螺旋和β-折叠含量降低,无规则卷曲含量增加,二级结构发生变化。湿热处理后Ara h 3空间结构发生改变,部分抗原表位遭到破坏或被包埋,抗原性降低。
基金funded by the National Key Research and Development Program of China(2016YFD0501101)the project of Food Science Discipline Construction of Shanghai University and the National Natural Science Foundation of China(31201306)。
文摘Little information was so far available about allergenic mechanism of the roasted peanut allergens during initial stages of allergy.The purpose of this study was to determine the influence of roasting(150℃,20 min)on biochemical and biological properties of Ara h 3,a major peanut allergen.Allergenicity of roasted peanut emulsion to mice,differences in uptakes between Ara h 3 purified from raw peanuts(named as Ara h 3-Raw)and that purified from roasted peanuts(named as Ara h 3-Roasted)by bone marrow-derived dendritic cells(BMDCs)and the implication of cell surface receptors involving in uptake,and changes in glycosylation and structure of Ara h 3 after roasting were analyzed in this study.This study suggested that roasting increased allergenicity of peanut to BALB/c mice.Maillard reaction and structural changes of Ara h 3 induced by roasting significantly altered the uptake of Ara h 3-Roasted by BMDCs,and modified Ara h 3 fate in processes involved in immunogenicity and hyper allergenicity,indicating that food processing pattern can change food allergenicity.
文摘以Ara h 3为免疫原免疫小鼠。选取血清效价高的小鼠再次免疫,制备出脾细胞后与骨髓瘤细胞一起进行细胞融合,得到杂交瘤细胞株,筛选阳性株制备大量单克隆抗体。通过酶联免疫吸附试验(ELISA)对制备的单克隆抗体进行效价测定、敏感性测定和特异性测定。通过蛋白质免疫印迹试验进一步验证其特异性。结果表明:免疫性较好的4B2单克隆抗体经纯化后的效价为1∶5.12×10^(5)。由敏感性测定得知4B2单克隆抗体的半抑制浓度(IC_(50))为389 ng/mL,证明其具有较好的敏感性,交叉反应率小于0.5%,成功制备出纯度高、效价高、敏感性好、特异性强的Ara h 3鼠源单克隆抗体,为建立免疫学快速检测方法奠定了基础。
文摘China-Arab States Tour Operators Conference of the Sixth China-Arab States Expo,co-hosted by the Ministry of Culture and Tourism and the People's Government of Ningxia Hui Autonomous Region,and organized by the Network of International Culturalink Entities and the Department of Culture and Tourism of Ningxia Hui Autonomous Region..
文摘Chinese President Xi Jinping made a trip to Saudi Arabia from December 7 to 10, during which Xi attended the first China-Arab States Summit and the China-Gulf Cooperation Council(GCC) Summit, held bilateral meetings with nearly 20 Arab leaders, and paid a state visit to Saudi Arabia.
文摘To thrive in a world that is undergoing changes not seen in a century,China and Arab states must enhance solidarity and collaboration.CHINA and Arab states are all developing countries.Combined,they account for one-sixth of the world’s land mass,one-fourth of the world’s population,and one-eighth of the world economy.
文摘为高效分离纯化花生过敏原Ara h 6,通过脱脂、蛋白浸提、阴离子交换层析分离得到目的蛋白,并用十二烷基磺酸钠-聚丙烯酰胺凝胶电泳(SDS-PAGE)、基质辅助激光解吸/电离飞行时间质谱(MALDI-TOF/MS)及免疫印迹技术(Western blotting)对其进行鉴定。结果表明,该蛋白为花生过敏原Ara h 6,其分子质量约为15kD,纯度大于95%,得率为22.5%。该方法简单、高效,可为花生过敏的进一步研究提供实验材料。
