Mannopyranosyl-D-erythritol

An apparently similar type of mannan is formed exocellularly by a certain Rhodotorula species. Rhodotorula glutinis mannan has a specific rotation of —78°, and consists of a linear chain of at least 90 units, which is overoxidized somewhat with periodate, consuming 0.61 mole of oxidant with formation of 0.07 mole of acid per mole of mannose residue after two days. Partial hydrolysis gives 4-0-)3-D-mannopyranosyl-D-mannose and 0-j8-D-mannopyranosyl-(1 3)-0-/8-D-mannopyranosyl-(1 4)-D-mannose, but a)8-D-(l- 4)-linked manno-triose is not detectable. Since 2-0-j8-D-mannopyranosyl-D-erythritol is obtained from the mannan by a Smith degradation, an alternating ar-... 

D-galactopyranosyl-D-arabinopyranoside l-O- -o-mannopyranosyl-L-erythritol 4-0- -o-galactopyranosyl-D-glucopyranoside (lactose) 6-0-a-D-galactopyranosyl-D-glucopyranoside (melibiose) l-O-a-o-glucopyranosyl-... 

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