Plasma expanders (PEs) such as hydroxyethyl strach are widely used for volume replacement. The plantation and production of tapioca in Thailand is abundant which may provide a new source for PEs starch with novel properties. This work investigated the properties and circulatory effects of native tapioca starch-based PE (TPE). Various formulations of mixture between native tapioca starch and 0.9% sodium chloride solution were prepared and characterized in order to obtain the proper physicochemical and rheological properties. About 1% concentration by weight per volume of TPE was compared with 6% hydroxyethyl starch 130/0.4 in 0.9% sodium chloride (HES130/0.4) using an acute hemodilution by 40% of blood volume in an animal protocol. TPE had higher turbidity and viscosity but lower colloid osmotic pressure compared with HES 130/0.4. The in vivo study demonstrated that Golden Syrian hamsters hemodiluted with TPE maintained a mean arterial blood pressure and no significant difference compared to HES 130/0.4. The arterial vasodilation and functional capillary density in the animals hemodiluted with TPE had higher values than in the animals hemodiluted with HES 130/0.4. Although the in vivo study reported positive results using this native tapioca starch-based PE, the product needs work to improve some of its physiochemical properties.
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