醋酸乙酯

Aim To prepare lower degree of substituted starch acetate with cassava starch as material, acetic anhydride as acetylation reagent, sodium hydroxide as catalyst and sodium sulfate as gelatinization inhibiter.

目的 以木薯淀粉为原料，醋酸酐为乙酰化试剂，NaOH为催化剂，Na2SO4为膨胀抑制剂，制备了低取代度木薯淀粉醋酸酯。

This paper deals with making stop bleeding sponge with dried small shrimps. Firstly breaking away with inorganic salt and proteir in the dried small shrimps with acid and NaOH, secondly, taking off vinyl-in the chitin with 50% NaOH, temperature is 110 ℃. the last, reacting with chitosamine and PVA-124 make stop bleeding sponge were produced, catalyst is PdCl 2. The sponge film and sparkce is setatisfaction.

用虾壳经除盐，去蛋白处理后，用50％的NaOH溶液在110℃的温度下脱乙酰基制备壳聚糖；以1∶9的稀醋酸溶作溶剂，氯化钯作催化剂，甲苯二异氰酸酯作发泡剂、交联剂，使壳聚糖与PVA－124进行交联成膜，发泡用氨水洗成中性后在80℃的红外灯烘箱下烘干，制得止血海棉

After acid hydrolysis of urine, primary amino acids were derivatized with ortho-phthaldialdehyde and removed from the sample by use of silica gel, followed by devivatized of hydroxyproline with 9-fluorenylmethyl chloroformate, and then injected into a C8 reversed-phase column.

采用邻苯二甲醛和芴甲基氯甲酸酯两个衍生剂，先后处理尿标本，以国产C8柱为固定相，在醋酸钠缓冲液中加入23%的乙腈作为洗脱液，3，4-脱氢脯氨酸作为内标。

The process was methanolysis ed alkyl inino-acetic acid ester hydrogen chloride salt from methyl-cyanide.

研究了由乙腈为原料经烷基亚氨基醋酸酯盐酸盐醇解制备原乙酸三甲酯的工艺方法，对投料比、反应温度、反应时间及中和指示剂等工艺条件进行了研究，得出较优惠的工艺条件。

A second group includes those compositions, which include an organic polymeric binding material, eg, mixed cellulose esters of monobasic or dibasic acids such as cellulose acetate succinate; an addition-polymerizable ethylenically unsaturated compound, eg, vinylidene and vinyl monomers, preferably of the acrylic or alkacrylic ester type; eg, triethylene glycol diacrylate; and an addition-polymerization initiator which forms radicals under the influence of actinic radiation, eg, anthraquinone.

第二组包括那些作品，其中包括有机聚合物具有约束力的物质，例如，对一元或二元酸混合纤维素酯，如醋酸纤维素琥珀酸； 1此外，聚合ethylenically不饱和化合物，例如，偏和乙烯基单体，丙烯酸最好的或alkacrylic酯类型，如，三乙二醇二丙烯酸酯；和加成聚合引发剂的形式下光化辐射的影响自由基，例如，蒽醌。

With sodium acetate as catalyst, inosine was esterified with acetic anhydride in the yield of 92% to give 2',3',5'-triacetyl inosine, which was treated with pyridine and phosphorus oxychloride to form a pyridinium solution, followed by performing an amination at 40℃ and 0.25~0.30 MPa to achieve adenosine in the yield of 67%.

肌苷在醋酸钠存在下与醋酸酐发生酯化反应以92%的收率得到2'，3'，5'-三乙酰肌苷，其化合物经吡啶和三氯氧磷处理形成吡啶盐溶液，未分离直接在40℃、0.25~0.30 MPa压力下进行氨解反应以67%产率制得腺苷。

The determination of amino acids in blood clam antianaemia oral liquid using HPLC-AccQ-Tag method is reported. The oral liquid reacted with 6-aminoquinolyl-N-hydroxysuccini-mdyl carbamate. Then, the corresponding derivatives were analyzed with an HPLC. The chromatographic conditions were AccQ-TagTM C18 column for amino acids analysis (3.9mm×15cm); mobile phase of program elution sodium acetate solution(pH5.02), acetonitrile, Milli-Q water. The amino acids'AQC deriatives were detected at 248nm with a UV-detector. Eighteen kinds of amino acids were completely determined in 35 minutes.

以6-氨基喹啉-N-羟基琥珀酰亚胺基氨基甲酸酯为衍生剂，与毛蚶抗贫血口服液中的氨基酸柱前定量衍生，用WatersHPLC仪，AccQ-TagTM专用C18柱(3.9mm×15cm)，以140mmol·L-1的醋酸钠溶液(pH5.02)为溶剂A，乙腈为溶剂B，超纯水为溶剂C，进行梯度洗脱，检测波长为248nm，35min测试完毕。

Methods The amino acids in the injections were pretreated with 6-aminoquinolyl-N-hydroxysuccinimdyl separately and their derivatives were analyzed on Waters 2695 HPLC using AccQ-Tag column. Gradient eluents consisted of sodium acetate solution (pH 4.95), acetonitrile and water. The Detection wavelength was 248 nm and column temperature 37℃.

采用AccQ-Tag法，以6-氨基喹啉－N-羟基琥珀酰亚胺基甲酸酯为衍生试剂，与复方氨基酸注射液(18AA-V)中17种氨基酸柱前衍生，用Waters 2695 HPLC仪器，AccQ-Tag柱，以醋酸钠(pH 4.95)缓冲液为流动相A，乙腈为流动相B，水为流动相C进行梯度洗脱，检测波长为248 nm，柱温为37℃，进样量为5μL。

DM is mainly used as high-boiling point solvent for printing ink, dyestuff, resin, cellulose and painting.

二乙二醇丁醚醋酸酯有着十分高的沸点，主要用于高温烤瓷以及印刷油墨的高沸点溶剂，也用作乳胶漆的助聚结剂；由于该溶剂挥发速度很慢，在水中溶解度低，所以可作为丝网印刷油墨的溶剂，以及聚苯乙烯涂料印花釉的溶剂；也可作为共沸剂用于醇与酮的分离。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。