高效液相色谱法测定帕拉金糖

采用高效液相色谱法 (HPL C) ,以 Kromasil KR10 0 - 5 NH2 柱为分析柱 ,乙腈 -水 (4∶ 1)为流动相 ,示差折光仪为检测器 ,一次进样能同时测定样品中果糖、葡萄糖、蔗糖、帕拉金糖等。方法变异系数为 0 .41%～ 0 .85% ,回收率为 98.6 7%～ 10 1.7% ,线性相关系数为 0 .99992～ 1.0 0 0 0。最低检出限在微克级     

腐霉利的气相色谱分析

探讨了腐霉利的气相色谱分析方法 ,采用氢焰离子化检测器 ,5% OV- 1 0 1 Chromosorb G.AWDMCS填充的 1 .0 m× 3mm i.d玻璃柱 ,柱温 2 50℃ ,检测室和汽化室温度 2 70℃ ,以邻苯二甲酸二辛酯为内标物。实验结果为 :回收率在 1 0 0 .0 %～ 1 0 3.6% ,变异系数≤ 0 .1 1 %。     

亚氨基二乙酸的高效液相色谱测定

本文描述利用液相色谱 ,采用外标法测定样品中亚氨基二乙酸的含量 ,紫外检测器检测波长为 2 1 0nm ,色谱柱为SAX强阴离子交换柱 ,采用 0 .0 0 5M磷酸二氢钾缓冲液 (pH =2 .5)为流动相 ,对样品进行分析。线性相关系数为 0 .9996,标准偏差为 0 .0 35,实验回收率为 98.5 %～ 1 0 1 .5%。     

福美双·三唑酮悬浮剂的高效液相色谱分析

用反相高效液相色谱法 ,采用ODS色谱柱 ,以甲醇 ( 70∶3 0V/V)作为流动相 ,在 2 54nm下对福美双、三唑酮复配制剂进行同柱分离与定量分析。福美双、三唑酮的标准偏差分别为 0 .0 76和 0 .0 74 ,回收率分别为 1 0 0 .0 3 %和 1 0 0 .2 0 % ,最大变异系数为 0 .98%。     

二嗪磷原油的气相色谱分析

采用气相色谱法 ,选用OV 17玻璃柱 ,邻苯二甲酸二丁酯为内标物 ,测定二嗪磷原油中有效成分的含量。方法的标准偏差为 0 19% ,变异系数为 0 2 0 % ,回收率为 99 5 1%～ 10 0 2 %     

33%苯噻酰·异丙·苄可湿性粉剂的高效液相色谱分析

采用甲醇 水 (HAC)为流动相体系 ,C18反相柱为分析柱 ,紫外检测器进行检测的反相高效液相色谱法同时测定 33%苯噻酰·异丙·苄可湿性粉剂中三个有效成分的含量。该方法测定苯噻酰草胺、异丙甲草胺和苄嘧磺隆的标准偏差分别为 0 94、0 0 70、0 0 2 9,变异系数分别为 0 37%、1 4 4 %、0 85 % ,平均回收率分别 10 0 3%、99 7%、99 2 % ,线性相关系数分别为 0 99978,0 99992 ,0 99994。     

草除灵的液相色谱分析

介绍了用高效液相色谱法 ,采用HypersilC1 8色谱柱 ,以水和甲醇为流动相 ,在 2 5 4nm下检测 ,外标法定量分析草除灵的方法 ,方法的标准偏差为 0 .0 66,变异系数为 0 .44% ,回收率为 99.5 0 %～ 10 0 .0 0 %。     

甲基膦酸二甲酯（DMMP）的气相色谱分析研究

研究了用气相色谱法测定新型磷系阻燃剂———甲基膦酸二甲酯 (DMMP)含量的方法 ,色谱柱采用的是 1.5m× 3.5mm不锈钢填充柱 ,10 %siliconeoilXE6 0作固定液。该方法的变异系数为 0 .5 5 %～ 1.2 0 % ,平均回收率为 99.2 7%～ 10 0 .5 %。实验结果表明 ,该方法分析速度快 ,且线性范围宽 ,分析结果准确可靠     

高效液相色谱法测定仲丁威及其主要杂质

采用高效液相色谱法 ,使用反相色谱柱和紫外检测器 ,用外标法对仲丁威原药的有效成分及主要杂质进行定量分析。方法的标准偏差分别为 0 4 5、 0 0 3;变异系数为0 4 8%、3 37% ;线性相关系数为 0 99993、0 99991;回收率为 99 3%～ 10 1 0 5%、99 6%～ 10 2 5%。     

5%锐劲特悬浮剂的高效液相色谱分析

采用高效液相色谱法 ,使用反向色谱柱和紫外检测器 ,用外标法对 5 %锐劲特悬浮剂进行定性、定量分析。方法的标准偏差为 0 0 3,变异系数 0 6% ,线形相关系数 0 9998,回收率 98 7%～ 10 0 .4 %     

The phospholipid composition of human placenta,endometrium and amniotic fluid: A comparative study

The contents of lecithin in human lung, liver, spleen, kidney, heart muscle, skeletal muscle, placenta, endometrium, amniotic flud, and brain gray and white matter are 52.1–54.2%, 44.2–45.8%, 42.6–44.5%, 35.1–37.2%, 42.5–43.0%, 48.0–50.0%, 45.5–46.4%, 42.0–43.0%, 65.0–66.0%, 23.9–24.3% and 24.7–24.9% respectively in total phospholipids. The level of diphosphatidyl glycerol is much lower in placenta, lung and spleen, and almost absent in amniotic fluid and brain; the heart muscle has 8.6%. The content of phosphatidyl serine is high in endometrium and brain. The content of sphingomyelin is high in lung, spleen, kidney and brain as compared to liver, heart muscle, skeletal muscle and endometrium. It is suggested that the phospholipid composition of various human tissues is characteristic for that class.     

Seed oils ofAcacia holosericea A. Cunn. ex G. Don.: Characteristics and composition

Like the fruits ofElaeis guineensis, the seeds ofAcacia holosericea have two types of oils. One is present in the yellow aril (56%), which is attached to the black seed, and the other is in the kernel of the seed (12%). The proximate composition of seed and the physicochemical characteristics of the solvent-extracted oils are reported. The aril fat is quite different from the seed oil in all respects. In descending order, the major fatty acids in aril fat are 18∶1 (54.35%), 16∶0 (29.3%), and 18∶2 (8.0%), whereas in seed (−aril) oil, the order is 18∶2 (59.45%) 18∶1 (20.2%), and 16∶0 (10.0%). In whole seed (+aril) oil, the order is 18∶2 (53.3%), 18∶1 (25%), 16∶0 (12.6).     

30%三唑磷微乳剂的制备

以起始外观、冷藏[(0±2)℃,7 d]外观、热贮[(54±2)℃,14 d]外观和/或稀释稳定性(1∶200倍液)合格和/或流动性好为标准,考察了不同表面活性剂、助剂、助溶剂、水的用量等对30%三唑磷微乳剂性能的影响。结果表明,优化的配方为:三唑磷30%,丁醇1%~3%,二甲苯3%~5%,二甲基甲酰胺3%~5%,乳化剂(500#、NPE-PO4、1602#和400#按一定比例混合)17%~20%,水余量。该微乳剂贮藏稳定性良好,平均分解率为2%;田间药效试验显示,在有效成分浓度相同时,30%三唑磷微乳剂药效好于40%三唑磷乳油,但两者差异性不显著,前者的工厂成本比后者低。     

Preparation and characterization of soy protein isolate/SiO2 nanocomposite films and their walnut oil microcapsules

In this study, nano-SiO₂/soy protein isolate composite film was prepared by casting method. The effects of (adding 0%, 1%, 3%, 5%, 7%, and 9% w/w) nano-SiO₂ on the properties of the resulting blend films were investigated. Results showed that the addition of 5% nano-SiO₂ exhibited good barrier properties. The mechanical properties including tensile strength and elongation at break of the film with 7% nano-SiO₂ is increased by 82.6% and 31.49% correspondingly. Differential scanning calorimetry indicated that the melting temperature of the composite film is increased by 56.6°C compared with the pure film. The wall material modified by nano-SiO₂ (adding 1%, 3%, 5%, 7%, and 9% w/w) was used for encapsulating walnut oil by spray drying. After accelerating oxidation test at 63°C for 12 days, we found that the encapsulation efficiency value of walnut oil microcapsules with 0%, 1%, 3%, 5%, 7%, and 9% nano-SiO₂ decreased by 64.23%, 48%, 21%, 22%, 21.00%, and 31% respectively. The results suggested that the stability of the core material was improved by adding nano-SiO₂ to the wall material.     

THE ESTIMATION OF THE ALUMINA CONTENT OF DIASPORE AND BURLEY CLAY FROM THE SILICA CONTENT1

The formula, % Al₂O₅= 0.85 ×% SiO₂+ 0.85 (100 – 2.15 ×% SiO₂) – 5.1, is presented for use in estimating the per cent of All08 of diaspore and burley clays. The silica determination is quick enough and cheap enough to make control testing of carload shipments practicable. The method applies to the lowest-grade burley as well as the highest-grade diaspore. The results of 381 actual analyses are presented showing that the method is accurate to 1% in 65% of the tests and to 2%, in 89% of the tests.     

A simplified model for prediction of pozzolanic characteristics of fly ash, based on chemical composition

The correlation between type and quantity of glassy phase and chemical composition of fly ash has been reviewed. A simplified model based on above has been proposed for assessment of pozzolanic reactivity of fly ash in terms of compressive strength of fly ash cement mortar. The model is fitted for 10%, 20%, 35% and 50% of fly ash replacement and for 28, 91 and 365 days of curing period using a least squares technique. The model is found to predict well for more than 20% fly ash replacement. The correlation coefficient (R²) between predicted and experimental values is maximum for 50% replacement. The model fit for 10% replacement of fly ash is poor.     

Cephalaria syriaca seed oil

Cephalaria syriaca shrad., in Turkish pelemir, grows predominantly in the southeastern district of Turkey as a weed in cereal fields. Pelemir seeds are sometimes used for extraction of their oil, as an improver of baking value of wheat, and as an antistaling agent for bread. The seeds contain 7.8% moisture; their chemical composition on a dry basis is: crude fat, 25.3%, crude protein, 15.9%; N-free extract, 40.4%; crude fiber, 11.9%; crude ash, 6.5%. Characteristics of the seed oil are: specific gravity at 25 C, 0.9229; refractive index at 25 C, 1.4706; saponification value, 192; iodine value, 88.4; thiocyanogen value, 58.8; Reichert-Meissl value, 0.36; Polenske value, 0.25; unsaponifiable matter, 1.24%; hydroxyl value, 20.9. The fatty acid components are: lauric acid, 1.5%; myristic acid, 19.5%; palmitic acid, 9.4%; stearic acid, 2%; oleic acid, 23.0%; linoleic acid, 36.9%. The chemical composition of extracted cakes on a dry basis is: crude protein, 20.4%; crude fat, 0.8%; N-free extract, 50.5%; crude ash, 6.4%; crude fiber; 14.4%%; saponin, 7.5%. The oil contains 7.8% epoxy acid, calculated as epoxy oleic acid, which makes its use as an edible oil rather difficult but renders it usable in industries using epoxidized oils. Due to its high content of myristic acid, the oil is very suitable for soapmaking as well.     

The nonpolar egg wax lipids of the cattle tick,Boophilus microplus (Canestrini)

About 40% of the lipids of the egg wax ofBoophilus microplus are nonpolar and comprise hydrocarbons (10%) and was esters (90%). The hydrocarbon fraction is 87% unbranched alkanes, the major components being n-nonadecane (10.8%), n-eicosane (12.1%), and n-heneicosane (9.8%). This fraction also contains 2,4,6-cholestatriene (4.6%). The majority of the acids are branched (77%), the major components being 12-methyl-tetradecanoic (16.3%) and branched hexadecanoic acids (28%). The major alcohols are n26∶0 (20.4%), n28∶0 (47.3%) and n36∶0 (18.2%). A steroid, possibly 2,4,6-cholestatrien-25-ol (5.6%), is also present.     

同步反硝化短程除硫功能菌群的变化及鉴定

依据反硝化除硫理论,利用全混流反应器富集反硝化除硫菌,采用平板计数法和PCR-DGGE法对功能菌群进行跟踪和鉴定,并对分离纯化得到的单菌株SNB1进行鉴定。结果表明,反应器中细菌总量、除硫菌和反硝化菌分别增加了1.92×10、6.49×105和1.66×103倍。稳定运行时反应器内存在3种优势菌群。a菌群与Thauera sp.的同源性高达99%,为反硝化菌;其包含的SNB1生理生化指标显示为一株兼性自养反硝化除硫菌,且与Thauera selenatis(同源性高达99.0%)最相似;反硝化除硫菌的比例为49.3%,数量约为3.70×109cfu.ml-1。b菌群与Desulfovibrio sp.的同源性高于98%,为硫酸盐还原菌。c菌群和Rhodococcus sp.的同源性高于94%,为反硝化菌。当S/N在0.007～0.386间变化时,除S2-始终被100%转化为S0外,还有大于46.47%的SO42--S被转化为S0;而NO3-和COD的去除率分别为72.3%～95.8%和9.8%～43.5%。     

Synthesis and Thermal Properties of Boron-Nitrogen Containing Phenol Formaldehyde Resin/MMT Nanocomposites

The nanocomposites of boron-nitrogen containing phenol formaldehyde resin (BNPFR) and organic-montmorillonite (O-MMT) (BNPFR/MMT) were synthesized from phenol, formaldehyde, boric acid, ammonia water and montmorillonite. The thermal properties of nanocomposites were characterized. The results show that the remaining weight fraction of BNPFR is 68.82% at 750°C, but the hybrid nanocomposite (BNPFR/MMT) is 75.51%. At 900°C, the remaining weight fraction of 7% O-MMT containing nanocomposites is 72.89%, which is 11.46% higher than BNPFR. The mechanical loss peak temperature T _p of BNPFR/MMT nanocomposites is 194.6°C, which is higher 7.3°C than that of BNPFR.