Properties and Characteristics

 

Cyclodextrin (CDs) is a kind of cylco-Oligosaccaride. It is also the most steady  and popular molecule microcapsule materials in recent time, It is natural and made from natural starch.   The conformation of the glucose units in the cyclodextrin places the hydrophilic hydroxyl groups at the top and bottom of the three dimensional ring and the hydrophobic glycosidic groups on the interior.So the outer side of bucket keeps strong hydrophile characteristics, the inner side of bucket keeps hydrophobic characteristics. Just because of the unique bucket’s hydrophilic characteristics of outter side and hydrophobe charaacteristics of inner side, it can entrap many kinds of guest moleculesin their internal, particularly to entrap oil form substance and form inclusion complexes.  If the guest substance included by cyclodextrin to form inclusion complexes, the stability and solubility  increase obviously ,  and volatility reduced a lot. Depending on it’s unique characteristc, CD is widely applied in the fields of pharmaceuticals industry, food industry,   cosmetics industry and  household chemicals,

light industry,agricultures etc.

 

The properties of Cyclodextrin (CDs)

 

Cyclodextrin CD

Alpha-CD

Beta-Cd

Gama-CD

HP-BCD

Glucose units

6

7

8

7

M.W. weight

973

1135

1297

1500

Cavity Diameter (Å)

4.7 - 5.3

6.0 - 6.5

7.5 - 8.3

6.0 - 6.5

Cavity  High (Å)

7.9

7.9

7.9

7.9

Cavity Volume (Å)

174

262

427

262

Specific Rotation

150.5°

162.5°

177.4°

126.50°

Iodine complex color

Blue+Purple

Yellow

Yellow+Brown

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Crystal Shape

Needle shape

Board shape

Board shape

 

Without certain shape

Solubility (g/100ml,25)

14.5

1.85

23.2

50 min.

Stability: Thermal Stability<200, Alkaline solution  (PH<14), Acidic solution (PH>3)