Lactose, or milk sugar, is a disaccharide composed of glucose & galactose found mainly in the milk of lactating female eutherian mammalians. You can build glucose (β-D-glucose) & galactose (β-D-galactose) models separately for comparison & note that they are carbon 4 epimers.
Combine them so that the β(1→4) glycosidic bond connects anomeric carbon 1 of β-D-galactose to the hydroxyl group on carbon 4 of the β-D-glucose to form β-D-lactose. This structure results in a relatively linear arrangement of the two monosacharride sub-units as shown also in a stand Haworth projection.
Lactose is the principal carbohydrate in mammalian milk. Aside from being an essential energy source in infants it also facilitates the uptake of calcium and other minerals necessary for bone development. It has a further advantage of promoting fewer cavities in teeth than other sugars such as sucrose, glucose, and fructose.
Indigo Instruments has maintained a substantial inventory of genuine Cochranes of Oxford (Orbit) parts for 30+ years (scroll down to see "Skeletal (Orbit/Minit) and are compatible with every molecular model kit we have sold since day 1. This level of quality may appear expensive but no parts support from other vendors costs even more.
P/N | Description | QTY |
---|---|---|
68186-20 | Wobbly bond, 20mm, each | 225 |
68186-30 | Wobbly bond, 30mm, each | 250 |
68216C | Atom, Orbit, H "a", white, 1 prong | 200 |
68218C | Atom, Orbit, O "a", red, 1 prong | 3 |
68230C | Atom, Orbit, O "d", 110 degree, red | 100 |
68241C | Atom, Orbit, C "j", planar: 120-120-120, black | 3 |
68242C | Atom, Orbit, N "j", planar: 120-120-120, blue | 3 |
68244C | Atom, Orbit, C "k", tetrahedral, black | 100 |
68267C | Atom, Orbit "x", double/triple bond peg/insert | 6 |
68366 | Orbit bonds, opaque, 20mm, 15/bundle | 1 |