Preparation of biodiesel from waste oils containing 72% of free fatty acids catalyzed by a novel Br?nsted acidic ionic liquid 1-sulfobutyl-3-methylimidazolium hydrosulfate([BHSO_3MIM][HSO_4]) was systematically invest...Preparation of biodiesel from waste oils containing 72% of free fatty acids catalyzed by a novel Br?nsted acidic ionic liquid 1-sulfobutyl-3-methylimidazolium hydrosulfate([BHSO_3MIM][HSO_4]) was systematically investigated.The optimum molar ratio of methanol to waste oils,catalyst amount,reaction temperature and reaction time were 8/1,10%(based on the mass of waste oils),140°C and 6 h,respectively,under which the obtained yield of biodiesel reached 94.9%.Also,[BHSO_3MIM][HSO_4] as a catalyst still retained around 97% of its original catalytic activity after successive re-use of 5 batches(6 h per batch),showing the excellent operational stability.Moreover,the acidic IL [BHSO_3MIM][HSO_4] was able to ef ficiently catalyze conversions of waste oils with different amounts of FFAs(free fatty acids) into biodiesel,and showed tremendous application potential.Therefore,an ef ficient and environmentally friendly catalyst is provided for the synthesis of biodiesel from waste oils with high acid value.展开更多
目的探究血清摄食抑制因子(Nesfatin-1)、类胰岛素生长因子结合蛋白3(IGFBP-3)、成纤维细胞生长因子21(FGF-21)联合检测对特发性矮小症(ISS)的诊断价值。方法本研究选取2022年6月至2023年6月期间在本院诊治的85例ISS患儿记为ISS组,另选7...目的探究血清摄食抑制因子(Nesfatin-1)、类胰岛素生长因子结合蛋白3(IGFBP-3)、成纤维细胞生长因子21(FGF-21)联合检测对特发性矮小症(ISS)的诊断价值。方法本研究选取2022年6月至2023年6月期间在本院诊治的85例ISS患儿记为ISS组,另选74例在本院体检的儿童记为对照组,记录两组儿童一般资料并进行比较分析。酶联免疫吸附实验(ELISA)检测受试者血清Nesfatin-1、IGFBP-3、FGF-21;使用原子吸收光谱仪测定受试者血清营养元素钙(Ca)、镁(Mg)、铜(Cu)、铁(Fe)、锌(Zn)的水平。X线骨密度仪检查受试者骨龄(BA)。Pearson相关性分析ISS患儿血清Nesfatin-1、IGFBP-3、FGF-21水平的相关性;多因素Logistic回归分析影响儿童发生ISS的影响因素;受试者工作特征(ROC)曲线分析Nesfatin-1、IGFBP-3、FGF-21水平对ISS的诊断价值;通过Z检验比较曲线下面积(AUC)的差异。结果与对照组相比,ISS组BA、身高、体重、BMI以及IGFBP-3、FGF-21水平较低,Nesfatin-1水平、性发育状态I级人数较高(P<0.05);ISS组患儿Nesfatin-1与IGFBP-3、FGF-21水平呈负相关(r_(Nesfatin-1 vs IGFBP-3)=-0.469,r_(Nesfatin-1 vs FGF-21)=-0.483),IGFBP-3与FGF-21水平呈正相关(r_(IGFBP-3 vs FGF-21)=0.456)(P<0.05);BA、性发育状态、IGFBP-3、FGF-21是儿童发生ISS的独立保护因素,而Nesfatin-1是儿童发生ISS的独立危险因素(P<0.05);Nesfatin-1、IGFBP-3、FGF-21单独诊断ISS的AUC分别为0.831、0.836、0.823,3者联合诊断ISS的AUC为0.928,优于单独及两两联合诊断(P<0.05)。结论ISS患儿血清中Nesfatin-1水平较高,IGFBP-3、FGF-21水平较低,3者是儿童发生ISS的影响因素,联合诊断ISS具有较高价值。展开更多
基金Supported by the National Natural Science Foundation of China(21676104,21336002,21376096)the Open Funding Project of the State Key Laboratory of Bioreactor Engineeringthe Program of State Key Laboratory of Pulp and Paper Engineering(2017ZD05)
文摘Preparation of biodiesel from waste oils containing 72% of free fatty acids catalyzed by a novel Br?nsted acidic ionic liquid 1-sulfobutyl-3-methylimidazolium hydrosulfate([BHSO_3MIM][HSO_4]) was systematically investigated.The optimum molar ratio of methanol to waste oils,catalyst amount,reaction temperature and reaction time were 8/1,10%(based on the mass of waste oils),140°C and 6 h,respectively,under which the obtained yield of biodiesel reached 94.9%.Also,[BHSO_3MIM][HSO_4] as a catalyst still retained around 97% of its original catalytic activity after successive re-use of 5 batches(6 h per batch),showing the excellent operational stability.Moreover,the acidic IL [BHSO_3MIM][HSO_4] was able to ef ficiently catalyze conversions of waste oils with different amounts of FFAs(free fatty acids) into biodiesel,and showed tremendous application potential.Therefore,an ef ficient and environmentally friendly catalyst is provided for the synthesis of biodiesel from waste oils with high acid value.
文摘目的探究血清摄食抑制因子(Nesfatin-1)、类胰岛素生长因子结合蛋白3(IGFBP-3)、成纤维细胞生长因子21(FGF-21)联合检测对特发性矮小症(ISS)的诊断价值。方法本研究选取2022年6月至2023年6月期间在本院诊治的85例ISS患儿记为ISS组,另选74例在本院体检的儿童记为对照组,记录两组儿童一般资料并进行比较分析。酶联免疫吸附实验(ELISA)检测受试者血清Nesfatin-1、IGFBP-3、FGF-21;使用原子吸收光谱仪测定受试者血清营养元素钙(Ca)、镁(Mg)、铜(Cu)、铁(Fe)、锌(Zn)的水平。X线骨密度仪检查受试者骨龄(BA)。Pearson相关性分析ISS患儿血清Nesfatin-1、IGFBP-3、FGF-21水平的相关性;多因素Logistic回归分析影响儿童发生ISS的影响因素;受试者工作特征(ROC)曲线分析Nesfatin-1、IGFBP-3、FGF-21水平对ISS的诊断价值;通过Z检验比较曲线下面积(AUC)的差异。结果与对照组相比,ISS组BA、身高、体重、BMI以及IGFBP-3、FGF-21水平较低,Nesfatin-1水平、性发育状态I级人数较高(P<0.05);ISS组患儿Nesfatin-1与IGFBP-3、FGF-21水平呈负相关(r_(Nesfatin-1 vs IGFBP-3)=-0.469,r_(Nesfatin-1 vs FGF-21)=-0.483),IGFBP-3与FGF-21水平呈正相关(r_(IGFBP-3 vs FGF-21)=0.456)(P<0.05);BA、性发育状态、IGFBP-3、FGF-21是儿童发生ISS的独立保护因素,而Nesfatin-1是儿童发生ISS的独立危险因素(P<0.05);Nesfatin-1、IGFBP-3、FGF-21单独诊断ISS的AUC分别为0.831、0.836、0.823,3者联合诊断ISS的AUC为0.928,优于单独及两两联合诊断(P<0.05)。结论ISS患儿血清中Nesfatin-1水平较高,IGFBP-3、FGF-21水平较低,3者是儿童发生ISS的影响因素,联合诊断ISS具有较高价值。