α-葡聚糖(alpha glucan)是指由α-葡萄糖[註 1]聚合形成的聚糖[1]。澱粉(包括直鏈澱粉和支鏈澱粉)、糖原均屬於α-葡聚糖。在澱粉和糖原分子中,主鏈的不同單體之間由α-1,4-糖苷鍵聚合而成,在形成支鏈處,會有α-1,6-糖苷鍵存在[2][3]。另外,已有人工合成以α-1,3-糖苷鍵聚合的α-葡聚糖的報導[4]。
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