Takahashi Toru, Sakata Takashi
Laboratory of Animal Nutrition, Faculty of Agriculture, Okayama University, Okayama, Japan.
Nutrition. 2004 Apr;20(4):377-82. doi: 10.1016/j.nut.2003.12.011.
It is believed that solid particles are not responsible for digesta viscosity. However, solid particles are responsible for the viscosity of whole blood and fiber suspension such as wood pulp. Therefore, we measured viscosity of gut contents with and without solid particles. We also determined the contribution of solid particles to viscoelastic characters of gut contents.
We measured the coefficient of viscosity, shear rate, and shear stress of pig cecal contents by using a tube-flow viscometer before and after removal of particles.
The coefficient of viscosity of intact pig cecal contents was negatively correlated with shear rate, a typical character of non-Newtonian fluids. The removal of solid particles from the contents resulted in a Newtonian fluid with very low viscosity.
Solid particles were mainly responsible for the viscoelastic character of pig cecal contents. Accordingly, the contribution of indigestible solid food components, sloughed epithelial cells, and bacterial cell bodies to the viscosity of gut contents should be re-evaluated.
人们认为固体颗粒与消化物粘度无关。然而，固体颗粒会影响全血和纤维悬浮液（如木浆）的粘度。因此，我们测量了有固体颗粒和无固体颗粒时肠道内容物的粘度。我们还确定了固体颗粒对肠道内容物粘弹性特征的影响。
我们使用管式流动粘度计在去除颗粒前后测量猪盲肠内容物的粘度系数、剪切速率和剪切应力。
完整猪盲肠内容物的粘度系数与剪切速率呈负相关，这是非牛顿流体的典型特征。去除内容物中的固体颗粒后得到一种粘度极低的牛顿流体。
固体颗粒是猪盲肠内容物粘弹性特征的主要原因。因此，应重新评估难消化的固体食物成分、脱落的上皮细胞和细菌菌体对肠道内容物粘度的影响。
