D-果糖

important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">又稱左旋糖important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">。由甜菜菊或蔗糖important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">經酸解后分離而得的一種酮糖important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">。 important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">　白色粉末型結晶。密度1.6g/cm3。熔點103～105℃(分解)。中毒劑量(小鼠，皮下)5000mg/kg。1g溶于15ml乙醇。14ml甲醇，易溶于水、熱丙酮，溶于吡啶，乙胺和甲胺，微溶于冷丙酮。 important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">　　糖類important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">中甜的糖。存在于許多水果important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">及蜂蜜important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">中，亦是存在于牛與人精液important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">中惟一的糖，以呋喃糖important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">和吡喃糖important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">兩種形式存在，在20℃的水溶液中含20%呋喃糖。 important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">　　用作生化試劑important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">，important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">患者食用及食品添加劑important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">等的工業原料。

制備方法：important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">果糖以游離的形態大量存在于水果的漿汁和糖蜜中，由菊芋水解可得到果糖。將含有果糖的多糖體菊粉（Inulin，在秋季，土木香，蒲公英，大麗花等根中菊粉含量可達40%之多）進行水解，生成果糖，經分離而得成品，這是生產果糖的方法之一。蔗糖是工業生產果糖豐富的原料，用稀酸或轉化酶水解蔗糖，從混雜有D-葡萄糖的溶液中析離果糖，果糖不易結晶，但它與氫氧化鈣形成不溶性的復合物，分離后，通入二氧化碳，即可得到果糖結晶。利用蔗糖發酵制葡聚糖的發酵糖液，經氈袋過濾器過濾，送入乙醇蒸餾塔回收乙醇，蒸餾后的廢糖液加0.25%（重量/體積）活性炭攪拌，待液溫降至40℃以下進行離子交換，分離得到果糖。目前工業上大規模生產采用淀粉水解制備葡萄糖，經固定化葡萄糖異構酶轉化為轉化糖，其中含有42%果糖和58%葡萄糖，商業上稱果葡萄糖漿或高果糖漿。它的甜度與蔗糖相當，但具有天然蜂蜜香味和生產成本低等特點，已廣泛用于飲料和糖果糕點等食品工業。 important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">　
　
用途：important; float: none; word-spacing: 0px; font: 14px/24px arial, 宋體, sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; background-color: rgb(255,255,255); orphans: 2; widows: 2; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px">果糖有直接供給熱能，補充體液及營養全身的，比葡萄糖容易吸收利用，用作供給能量補充體液比葡萄糖更佳。除作為藥物外，也用于糖果，嬰兒飲料中。果糖也用作生化試劑。

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