Fischer glycosylationOHOHOH?+H+HOHOHCOHHOHOHC-H+OHOHROHOHOHRCC+H+HOHOHOORHOOHHOHO-H+④OHOHOHGlycosylcationPresenceof an oxygensubstituentαtotheanomeric carbon, makes any carbocation formedtheremorestable6
Fischer&glycosyla1on&& O OH HO HO OH OH +H+ -H+ O OH HO HO OH OH H O OH HO HO OH O OH HO HO OH R O H O OH HO HO OH OH R O OH HO HO OH OR +H+ -H+ Presence"of"an"oxygen"subs:tuent"α"to"the" anomeric"carbon,"makes"any"carboca:on"formed" there"more"stable" Glycosyl&& ca1on 6
DisaccharidesComposedof Glucose纤维二糖β-qlycoside bondrotateCH20HOHCH20HCellobioseC=hemiacetalHOCH2CHO-OHHO-two glucose unitsareducingsugar三HO.HOHjoined Cito C4HOHOHOLCH2OHasap-glycosideXC=acetalHO!-OHβ-glycosidebondnon-reducing sugarHa-giycosidebondsCH2OHHOCHβ-glycosidebondx-glycosidebondHOHOCH20HHO-HOCH2OHHOCHO.HOCHOHHOHO.OHHO-HOTrehaloseHO!GentiobioseMaltoseHOCH2人HO.two glucose unitstwo glucose unitstwo glucose unitsHO!OHjoined Ci to Cijoined C1 to C4joined C1 to C6as two ar-glycosidesas an ar-glycosideas a p-glycoside麦芽糖海藻糖龙胆二糖7
麦芽糖 龙胆二糖 海藻糖 纤维二糖 7
Maltose,MaltsugarSince1937SKINGOLDENarbeusMALTEDPANCAKE&WAFFLEFLOURBLUEBERRY21RS10)METWTARS-OI.beautybodyandskin.com8buyfoodsale.com
Maltose,&Malt&sugar& beautybodyandskin.com buyfoodsale.com 8
β-glycosidebondOHrotateHOLactoseCH20HH20HHO.6CH2?H-4-O-p-D-Galactopyranosyl-D-glucoseHOTOH/BHC[β-anomerisdrawn]HHO.H(HOC=hemiacetalHOWHO"CH2OHH6areducing sugarA=galactoseHO,'OHp-glycosidebondHB.=qlucoseA=qlucosesucrose16CH20HaHOCH2Xα-D-Glucopyranosyl-p-D-fructofuranosiderotateB=fructose180°β-D-Fructofuranosyl-α-D-glucopyranosideCHOH2COHHOHQ:OHOHHOHOTHOHglycoside bonds Ho3CH2OHH.CH2OHHOHC=acetal6'non-reducing sugarβ-D-Fructofuranose9
9
HOCH2OHHOHCH2OHHOHHOHOHO-CH2galactoseHOHHO-HHHOCH20HrHOHOHOCH2glucose0HOraffinoseHHOHOXHHOCH20HHOCH2HOHOfructose0HOn=1 stachvose-Hn=2verbascosesucroseHOCH2HO.棉子糖，蜜三糖OHOFHO水苏糖HO/HO00OH毛蕊花糖.OHHOCβ-cyclodextrinHOOHHO0HOOHOH'OHHOT环糊精0OHOOHOH10-OH
棉子糖，蜜三糖 水苏糖 毛蕊花糖 环糊精 10