Research on preparation of carboxymethyl starch with high degree of substitution;
高取代度羧甲基淀粉的制备研究
Synthesis of konjac glucomannan ester of palmitic acid and determination of degree of substitution
棕榈酸葡甘聚糖酯的合成及取代度的测定
Cellulose benzoate(CB),the degree of substitution(DS) of which was calculated from the content of C determined by element analysis,was prepared from microcrystalline celluloseand benzoyl chloride under heterogeneous condition and characterized by FT-IR and()~1H-NMR.
研究了微晶纤维素和苯甲酰氯在多相条件下合成制备纤维素苯甲酸酯(CB)的反应,通过元素分析所得碳的质量百分含量计算了产物的取代度(D S),并系统研究了吡啶与N,N-二甲基乙酰胺或与三乙胺混合反应溶剂、苯甲酰氯与纤维素羟基的摩尔比r、反应温度和反应时间对D S的影响,用FT-IR和1H-NM R对产物进行了表征。
Test of Influence of Substitution Degree on Cationic Starch Property;
取代度对阳离子淀粉性能的影响试验
Determination of substitution degree of N-succinyl-chitosan by conductometric titration;
电导滴定法测定N-琥珀酰壳聚糖取代度
Preparation of starch succinate with low substitution degree(DS) was studied by using corn starch as raw material,succinic anhydride as esterifying reagent,water as solvent and sodium hydroxide as catalyst.
以玉米淀粉为原料,丁二酸酐为酯化剂,以水为媒介,氢氧化钠为催化剂对低取代度淀粉丁二酸酯的制备工艺进行了研究。
Native starch was modified by etherification with acrylonitrile,and films were prepared from blends of polyvinyl alcohol(PVA) with cyanoethyl starch(CES) with different degrees of substitution(DS) by solvent casting methods.
研究了原淀粉通过丙烯腈醚化改性,用不同取代度的氰乙基淀粉与聚乙烯醇(PVA)利用溶剂流延法共混制膜。
The treatment effect of slightly polluted water with modified guar and the influence of such factor as reaction temperature,reaction time,consumption of chloroacetic acid,consumption of sodium hydroxide,ethanol dosage,and stirring time on the DS of carboxyl methyl guar were investigated,and the optimal reaction conditions for the preparation were also determined.
研究改性瓜尔胶处理微污染水的效果,以及反应温度、反应时间、氯乙酸用量、碱用量、酒精用量和搅拌时间等因素对羧甲基瓜尔胶取代度的影响,确定制备的最佳反应条件。
The results showed that the water reducing ratio of sulfonated starch is increased with the degree of substitution(DS).
结果表明:磺化淀粉减水率随磺酸基取代度增加而增加,当其取代度达到0。
Through single factor and orthogonal experiments,the effects of reaction conditions on degree of substitution(DS)and apparent viscosity(η)were investigated,and the optimum reaction conditions were .
通过单因素和正交试验,对其改性反应条件进行优化,以产物取代度(DS)和表观粘度(η)为评价指标,综合二者确定羧甲基化的最佳条件为:55℃、pH12反应3。
The best technical conditions were determined to obtain higher substitution CMC by the orthogonal experiment.
以取代度为目标,用正交实验方法确定了最佳工艺条件,制得较高取代度CMC。
All kinds effects of reaction on substitution of products were discussed through many experiments.
系统地研究以玉米高直链淀粉、环氧丙烷为主要原料,采用微乳化法合成羟丙基高直链淀粉工艺,通过实验探讨各影响因素对产品取代度的影响;并用X射线衍射仪、电子扫描仪等对产品性能进行分析。
Preparation of O-carboxymethyl chitosan oligosaccharide with different substituting degrees and their antioxidant activity;
不同取代度O-羧甲基壳聚糖的抗氧化性能
The factors affecting substituting degree were investigated.
考察了影响取代度的各因素,确定了最佳工艺条件。
Synthesis and characterization of starch acetate of high degree of substitution;
高取代度淀粉醋酸酯的合成及表征
Study on preparation of starch acetate with high degree of substitution by microwave with the high amylose
高直链淀粉微波制备高取代度醋酸酯淀粉的研究
Acetylated starches with high degree of substitution were synthesized from cornstarch with acetic anhydride as esterifying agent and methanesulphonic acid as catalyst.
以玉米淀粉为原料,醋酸酐为酯化剂,甲烷磺酸为催化剂,制备高取代度淀粉醋酸酯。
DS, D.S. (degree of substitution)
取代度,置换[程]度
EFFECT OF CARBOXYMETHYL STARCH WITH LOW DEGREE OF SUBSTITUTION ON THE ADHESION BEHAVIOR TO TEXTILE FIBERS
低取代度羧甲基淀粉对纤维粘附性能
Synthesis of Amylum Phosphate Monoester and Determination of Degree substitution;
淀粉磷酸单酯的合成及取代度的测定
Preparation for cassava starch acetate with low degree of substitution by acetic anhydride
醋酸酐制备低取代度木薯淀粉醋酸酯
Determination of the molar substitution degree and substitution position of hydropropyl guar gum
羟丙基瓜尔胶中羟丙基摩尔取代度以及取代位置的表征
THE STUDY OF THE PREPARATION OF CARBOXYMETHYL STARCH OF HIGH DEGREE OF SUBSTITUTION AND HIGH VISCOSITY
高取代度、高粘度羧甲基淀粉醚制备的研究
The most widely sold type for use as a food ingredient has a DS of 0.7.
食品配料中市售的主要类型是取代度0.7的CMC。
The effects of substitution degree on retrogradation and anti-mycotic were less.
取代度的变化对沉降性和抗霉菌能力影响不大。
Most commercial sodium carboxymethylcellulose (CMC) products have a degree of substitution (DS) in the range 0.4--0.8.
大多数羧甲基纤维素钠具有0.4～0.8的取代度(DS)。
study on the Preparation and Application of Cationic Starch with High Degree of Substitution
高取代度阳离子淀粉的制备与应用研究
The old system has been superseded.
旧制度已被取代了。
The system of obtaining a guarantor to post one's bail awaits trial in China ancient times to form in Song Dynasty
宋代与中国古代取保候审制度的形成
The system of barter was superseded by the use of money.
以物易物的制度被金钱的使用取代了。
Performance pay can't replance good managent.
业绩工资不能取代良好的管理制度。
In Terms of Han Dynasty the Palace is Blamed and Composed;
论汉代宫怨赋的情感维度与取象视野
On Measures with Values in von Neumann Algebras;
取值于von Neum ann代数的测度
Study on Solid Phase Extraction and Spectrophotometric Determination of Gold with Thio-Michler's Ketone
固相萃取-硫代米蚩酮光度法测定金
A representative slice of unit thickness in then taken for analysis purposes.
取代有代表性的单位厚度的薄片作为分析对象。