Cooley S, Livesey G
Br J Nutr. 1987 Mar;57(2):235-43. doi: 10.1079/bjn19870029.
The digestible energy (DE) and metabolizable energy (ME) values of a commercial Polydextrose product and the polymer that it contained were determined by metabolic energy balance in male Wistar rats and compared with values obtained by radiochemical balance using a radiochemical analogue. The energy values of the whole preparations and of the polymer fractions were estimated. In the energy-balance study of 6 d duration, 100 g maize starch/kg control diet were replaced by Polydextrose to provide a test diet. Polydextrose had no significant effects on food intake, body-weight gain, digestibility of nitrogen and N retention but significantly increased the water consumption to 143% of the control value (P less than 0.05) and the water content of fresh faecal pellets from 548 (SE 10) to 646 (SE 15) g/kg wet weight (P less than 0.01). By energy balance the DE in the Polydextrose product and in the polymer that it contained were 13.5 and 12.8 (SE 1.9) kJ/g respectively. The corresponding ME values were 12.7 and 12.1 (SE 1.8) kJ/g respectively. These values were higher (P less than 0.05) than the corresponding values obtained by the radiochemical balance procedure: DE 8.8 and 8.6 (SE 0.4) kJ/g polymer respectively and ME 8.0 and 7.8 (SE 0.5) kJ/g polymer respectively. These findings indicate relatively high energy values for Polydextrose by comparison with previously published values and illustrate a potential difficulty when using energy values obtained by certain radiochemical methods to estimate the energy values of a mixed diet given to rats. Several alternative explanations of the discrepancies are advanced.
通过雄性Wistar大鼠的代谢能量平衡法，测定了一种市售聚葡萄糖产品及其所含聚合物的可消化能量（DE）和代谢能（ME）值，并与使用放射性化学类似物通过放射性化学平衡法获得的值进行比较。估算了整个制剂和聚合物组分的能量值。在为期6天的能量平衡研究中，用聚葡萄糖替代100 g玉米淀粉/kg对照日粮，以提供试验日粮。聚葡萄糖对食物摄入量、体重增加、氮消化率和氮保留无显著影响，但显著增加了水消耗量至对照值的143%（P<0.05），新鲜粪便颗粒的含水量从548（标准误10）增加到646（标准误15）g/kg湿重（P<0.01）。通过能量平衡法，聚葡萄糖产品及其所含聚合物的DE分别为13.5和12.8（标准误1.9）kJ/g。相应的ME值分别为12.7和12.1（标准误1.8）kJ/g。这些值高于（P<0.05）通过放射性化学平衡法获得的相应值：聚合物的DE分别为8.8和8.6（标准误0.4）kJ/g，ME分别为8.0和7.8（标准误0.5）kJ/g。这些发现表明，与先前公布的值相比，聚葡萄糖具有相对较高的能量值，并说明了使用某些放射性化学方法获得的能量值来估算给大鼠的混合日粮的能量值时可能存在的困难。对这些差异提出了几种替代性解释。
