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Product description：
β-環(huán)糊精(β-cyclodextrin, cyclomaltoheptaose)
簡稱：CD 或CyD Initial: CD or CyD
其他名稱：Other names:
β-cyclodextrin molecular structure
b-環(huán)糊精的結(jié)構(gòu)性能參數(shù)properties of β-cyclodextrin
|
環(huán)糊精類型 |
b |
Type |
β |
|
葡萄糖單元數(shù) |
7 |
Number of glucose units |
7 |
|
分子量 |
1135 |
Molecular |
1135 |
|
室溫水中溶解度（g/100ml） |
1.85 |
Solubility in water g/100ml at ambient temp. |
1.85 |
|
比旋光度 [α]D25 |
162.5±0.5 |
[α]D25 |
162.5±0.5 |
|
空腔直徑（Å） |
6.0-6.5 |
Cavity diameter Å |
6.0-6.5 |
|
筒壁高度 （Å） |
7.9±0.1 |
Height of torus |
7.9±0.1 |
|
筒壁外緣直徑（Å） |
15.4±0.4 |
Dia. of periphery |
15.4±0.4 |
|
空腔體積 （Å3） |
262 |
Vol. of cavity(approx.) Å3 |
262 |
|
每摩爾分子空腔總體積（ml） |
157 |
Cavity vol (approx.): |
157 |
|
晶型（水中制備） |
單斜平行四邊形 |
Crystal forms（from water） |
monoclinic parallelogram |
|
C1-C4-C4 夾角 |
117.7 |
Crystallographic params. C1-C4-C4 angle |
117.7 |
|
φ/φº |
169/-172 |
φ/φº |
169/-172 |
|
O4---O4距離 （Å） |
4.29 |
O4---O4 distance Å |
4.29 |
|
O2---O3距離 （Å） |
2.86 |
O2---O3 distance Å |
2.86 |
|
水中結(jié)晶含水量（%） |
13.2-14.5 |
|
13.2-14.5 |
|
40ºC擴散常數(shù) |
3224 |
Diffusion const.40ºC |
3224 |
|
α-淀粉酶水解 |
緩慢 |
Hydrolysis by A. oryzae α-amylase |
slow |
|
酶水解最大速度（min-1） |
166 |
Vmaxvalue min-1 |
166 |
|
相對介電常數(shù) |
52.0 29.5 |
Relative permittivity |
52.0 29.5 |
|
25º |
12.202 |
Pk (by potentionmetry) 25ºC |
12.202 |
|
溶液中偏摩爾體積 （ml/mol） |
703.8 |
Partial molar volumes in solution ml/mol |
703.8 |
特點及應(yīng)用：Characteristics and usage:
β-環(huán)糊精分子具有一個獨特的分子內(nèi)空腔?；衔锓肿颖画h(huán)糊精空腔包結(jié)時，大大減少了其與周圍環(huán)境的接觸，可以起到許多特殊的作用，并且在工業(yè)生產(chǎn)中得到廣泛的應(yīng)用。目前已知的作用有以下幾個方面：
β-cyclodextrin molecule has a unique cavity. When molecule of a certain compound is trapped in the cavity, its contact opportunity with other substances becomes noticeably less. So, β-cyclodextrin has some special functions, it is used widely in industry. Its known functions are listed below:
1. 使揮發(fā)性物質(zhì)長期保持穩(wěn)定 stabilize volatile substance
① 降低揮發(fā)性物質(zhì)的揮發(fā)性，并保持其氣味、風味；Reduce volatility of volatile substance to keep its smell and taste;
② 將有毒液態(tài)物質(zhì)制成固體，容易保存，減少毒害；Turn toxic liquid into solid to facilitate storage and reduce toxicity;
③ 除去發(fā)臭物質(zhì)的臭氣，并改善加工和使用條件；Reduce the odor of some reeking substance to improve the process and use conditions;
④ 調(diào)節(jié)芳香物質(zhì)和其他揮發(fā)性物質(zhì)的釋放。Adjust the release rate of aromatic substances or other volatile substances.
2. 使受熱、光、氧不穩(wěn)定的物質(zhì)穩(wěn)定化 stabilize the substance that easily decomposed in thermal, light or oxygen.
① 使不耐熱物質(zhì)在高溫中保持穩(wěn)定；Improve temperature resistance;
② 使紫外線和可見光下不穩(wěn)定性物質(zhì)保持穩(wěn)定；Improve light resistance;
③ 使易被氧化和分解的物質(zhì)穩(wěn)定。Improve oxidation resistance;
3. 改變物質(zhì)的物理、化學性質(zhì)Adjust physical and chemical properties
① 增大難溶或不溶于水的物質(zhì)的溶解度；Increase water solubility;
② 防止色素、熒光變化；Prevent degradation of pigment and fluorescein;
③ 掩蓋怪味、苦味，增加物質(zhì)的使用價值；Reduce strange odor and bitterness;
④ 易自行分解、潮解、粘性物質(zhì)穩(wěn)定性的改善；Stabilize substances easily to decompose, deliquesce and become sticky.
4. 水不溶物的乳化、液化，如油、脂肪、脂肪酸等的乳化 Make some substances become dissolvable or emulsifiable.
5. 液體變固體，如烴、醇、酯、油、脂肪等Change some substance from liquid to solid, such as hydrocarbon, alcohol, ester and fat.
6. 用做有機化學的催化劑，選擇合成反應(yīng)試劑，物質(zhì)的分離、分析、醫(yī)療化驗等。Act as catalyst in organic chemistry, used in chemical separation, chemicals analysis, medical analysis and so on.
這些作用的多樣性和低廉的價格，使β-環(huán)糊精能夠廣泛用于醫(yī)療、食品、化學、農(nóng)業(yè)和其他行業(yè)領(lǐng)域，功能顯著。Wide usage and low price of β-cyclodextrin make it successful in medicals, food, chemistry, agriculture and other spheres.
