Lactose Chemical 4-O-β-D-Galactopyranosyl-β-D-glucopyranose
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Density 1.8± 0.1g /cm3
Boiling point 667.9±55.0 °C at 760 mmHg
Melting point 222.8°C
Molecular formula C12H22O11
Molecular weight 342.297
Flash point 357.8±31.5 °C
Accurate mass 342.116211
PSA 197.37000
LogP minus 3.41
Appearance properties white crystalline or crystalline powder. It is sweet, about 70% as sweet as sucrose. Odorless or slightly characteristic odor. Relative density d4201.525(water content). It has reducibility and dextrotropism. There are α-type and β-type isomers. Alpha-lactose can be broken down into glucose and galactose by acids and lactase enzymes. It can be converted into lactic acid by lactic acid bacteria, but cannot be utilized by yeast. The crystalline precipitates in water are C12 H22O11 monohydrate H2O, if heated at 120℃, can become anhydrous substance. Anhydrous melting point 201 ~ 202℃, 1g soluble in 5ml water or 2.6ml hot water, slightly soluble in ethanol, insoluble in ether. β-lactose precipitates in hot water above 93℃, solubility is different from α-lactose, 1g dissolved in 2.2ml water or
Vapor pressure 0.0±4.6 mmHg at 25°C
Refractive index 1.652
stability
White crystalline or crystalline powder. It is sweet, about 70% as sweet as sucrose. Odorless or slightly characteristic odor. Relative density d4201.525(water content). It has reducibility and dextrotropism. There are α-type and β-type isomers.
Alpha-lactose can be broken down into glucose and galactose by acids and lactase enzymes. It can be converted into lactic acid by lactic acid bacteria, but cannot be utilized by yeast.
In the water crystallization precipitation, is C12 H22O11.H2O monohydrate, such as heating at 120℃, can become anhydrous substance. Anhydrous melting point 201 ~ 202℃, 1g soluble in 5ml water or 2.6ml hot water, slightly soluble in ethanol, insoluble in ether.
β-lactose precipitates in hot water above 93℃, and its solubility is different from that of α-lactose. 1g is dissolved in 2.2ml water or 1.1ml hot water. Melting point 252℃, rotation [α]D20+53.6°. It can be hydrolyzed to glucose and galactose in 2% sulfuric acid emulsion.
Only exists in animal milk, human milk contains about 7%(5%-8%), cow milk contains about 4.5%(4%-5%). At body temperature, the mixture is balanced by a ratio of two alpha-types to three β-types. The common lactose commodity is α-type.
Water solubility 5-10 g/100 mL at 20 ºC
Molecular structure
1. Molar refractive index: 71.47
2, molar volume (cm3/mol) : 202.7
3. Isotropic specific volume (90.2K) : 648.4
4. Surface tension (dyne/cm) : 104.5
5. Polarization (10-24cm3) : 28.33
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