已入深夜,您辛苦了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!祝你早点完成任务,早点休息,好梦!

Characterization of Acetyl Starch by Means of NMR Spectroscopy and SEC/MALLS in Comparison with Hydroxyethyl Starch

摩尔质量 淀粉 化学 取代基 分散性 大小排阻色谱法 摩尔质量分布 核磁共振波谱 分析化学(期刊) 色谱法 核化学 立体化学 有机化学 聚合物
作者
Dorothee Heins,Werner‐Michael Kulicke,Peter Käuper,Heiko Thielking
出处
期刊:Starch-starke [Wiley]
卷期号:50 (10): 431-437 被引量:44
标识
DOI:10.1002/(sici)1521-379x(199810)50:10<431::aid-star431>3.0.co;2-f
摘要

The properties of starch derivatives which may be used as plasma substitutes, are dependent upon the molecular structure. Seven acetyl starch (AS) samples were determined and compared with results from hydroxyethyl starch (HES) samples. The molar masses and their distributions were determined with the combination of size exclusion chromatography and light scattering. Slightly asymmetric distributions were determined with a polydispersity Mw/Mn = 2.4 and weight-average molar masses of Mw = 250,000–300,000 g/mol for six AS samples and Mw/Mn = 3.6 and a weight-average molar mass of 766,000 g/mol for one AS sample. The average degrees of substitution (DS) and the substitution pattern were determined by high resolution NMR spectroscopy. The AS samples investigated had a DS of 0.42 to 0.81, comparable to HES, but the regioselective substitution pattern revealed differences. While for HES the position C-2 is preferred and the position C-3 has nearly no substituent, for AS both positions, C-2 and C-3, are substituted likewise. Degradability by α-amylase was tested in the laboratory for AS as well as for HES having nearly the same degree of substitution and molar mass, but C-2/C-6 = 2 for AS and C-2/C-6 = 1.4 for HES. An exponential decrease in the molar mass was observed over time, down to a limiting molar mass Mw = 50,000 g/mol for AS and Mw = 30,000 g/mol for HES, the degradation of AS occurred more slowly.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
2秒前
务实的焦完成签到 ,获得积分10
4秒前
Dz1990m完成签到,获得积分10
4秒前
5秒前
6秒前
充电宝应助cholate采纳,获得10
6秒前
梅子完成签到 ,获得积分10
8秒前
情怀应助哈哈哈哈采纳,获得10
9秒前
17秒前
runtang完成签到,获得积分10
18秒前
18秒前
ZM完成签到 ,获得积分10
20秒前
顾矜应助柔弱紊采纳,获得10
20秒前
赘婿应助科研通管家采纳,获得10
22秒前
22秒前
汉堡包应助科研通管家采纳,获得10
22秒前
Rondab应助科研通管家采纳,获得10
22秒前
Rondab应助科研通管家采纳,获得10
22秒前
哈哈哈哈发布了新的文献求助10
22秒前
隐形曼青应助科研通管家采纳,获得10
22秒前
22秒前
Rondab应助科研通管家采纳,获得10
22秒前
Zack完成签到,获得积分10
23秒前
爱卿5271完成签到,获得积分10
23秒前
樱桃猴子发布了新的文献求助10
23秒前
李健应助自由的寄灵采纳,获得10
25秒前
27秒前
28秒前
彭于晏应助hhhh采纳,获得10
28秒前
29秒前
34秒前
小灰灰完成签到 ,获得积分10
34秒前
34秒前
37秒前
稚祎完成签到 ,获得积分10
37秒前
37秒前
自由寻冬完成签到 ,获得积分10
38秒前
隐形曼青应助liuyiduo采纳,获得10
38秒前
默默白开水完成签到 ,获得积分10
39秒前
菜根谭完成签到 ,获得积分10
39秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3976572
求助须知:如何正确求助?哪些是违规求助? 3520659
关于积分的说明 11204365
捐赠科研通 3257284
什么是DOI,文献DOI怎么找? 1798667
邀请新用户注册赠送积分活动 877835
科研通“疑难数据库(出版商)”最低求助积分说明 806577