采用扫描电镜、凝胶过滤色谱、红外光谱和差示扫描量热仪等仪器手段，对一种可用于运动饮料的新型马铃薯淀粉源小分子糖Jxsac 4进行表征，包括基本理化性质、颗粒形貌、分子量分布、糊化性质、热力学特性和体外抗消化性质等。结果表明Jxsac 4属淀粉高度水解产物，其平均分子量为786 D。Jxsac 4中水分含量为6.70%，含有一定的灰分(0.84%)，蛋白质和脂肪含量均很低（不超过0.10%），直链淀粉含量非常低(0.11%)，蓝值为0，还原糖含量为29.05 g/100 g。该糖溶解度为97.00%，为冷水可溶性糖。其透光率为97.00%，沉降体积为4.00 mL/100 mL，这表明Jxsac 4具有较强的亲水性。红外光谱结果显示有淀粉源糖类的特征吸收峰。该小分子糖中快消化淀粉含量较高，为94.02%，而慢消化淀粉含量仅为5.80%。Jxsac 4有望作为一种可阶梯供能的运动饮料原料。

Scanning electron microscopy (SEM), gel filtration chromatography (GFC), infrared spectroscopy (IR), and differential scanning calorimetry (DCS) were used to characterize the properties of Jxsac 4, a novel oligosaccharide derived from potato starch, including its physicochemical properties, particle morphology, molecular weight distribution, pasting properties, thermal properties, and in vitro digestion-resistance capacity, for use in sports drinks. The results showed that Jxsac 4 was a highly hydrolyzed starch product with an average molecular weight of 786 D. In Jxsac 4, the water content was 6.70%, there was a certain amount of ash (0.84%), while protein and fat contents were relative low (less than 0.10%), amylose content was very low (0.11%), the blue value was zero, and reducing sugar content was 29.05 g/100 g. The solubility of Jxsac 4 was 97.00%, and it was soluble in cold water. Light transmittance and sedimentation volume of this sugar were 97.00% and 4 mL/100 mL, respectively, demonstrating that Jxsac 4 was highly hydrophilic. The FT-IR spectrum of Jxsac 4 showed the characteristic absorption peak for the functional groups derived from starch. The oligosaccharide had a high rapidly digestible starch content (94.02%), while the slowly digestible starch content was 5.80%. Jxsac 4 is a potential ingredient of sports drinks that can provide stepwise energy supply.

全军科研项目（AX110C002和AWS12J004）