The simple carbohydrates and the glucosides / by E. Frankland Armstrong.

  • Edward Frankland Armstrong
Date:
1910
Catalogue details

Licence: In copyright

Credit: The simple carbohydrates and the glucosides / by E. Frankland Armstrong. Source: Wellcome Collection.

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    tion of the corresponding aldoses. The hexose alcohols have been already described (p. 25). ^/-Mannitol and r/-dulcitol are widely dis- tributed in nature; ^-sorbitol is more rare, but it can be obtained with- out difficulty from ripe mountain-ash berries. Two heptose alcohols, C7H1G07, are known, eg., perseitol, occurring in Persea gratissima, and volemitol, discovered in Lactarius volemus, and since identified in the rhizomes of some species of primula. Perseitol is the alcohol corre- sponding to mannoheptose. An octitol has been isolated from the mother liquors of the sorbitol preparation from the fruit of some of the rosacea?. These alcohols are similar in properties to mannitol. Their physical constants are collected in Table VII.:— TABLE VII. Alcohol. 1 Melting-point. Optical Rotatory Power [«]B. Erythritol .... 126° inactive Adonitol .... 102° inactive Mannitol .... lt8° + 22*5° Dulcitol .... 18S0 inactive Sorbitol .... 1 IO° + I2\3° Perseitol .... 1800 - i-3°