《Table 3–Comparison of the properties of the acylated whey protein powder which prepared by differen

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《"Succinylated whey protein isolate as a sustained-release excipient of puerarin derivative oral tablets:Preparation,optimization and pharmacokinetics"》

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As shown in Table 3，bulk densities ranged from 0.23（Freezedried）to 0.64 g/ml（Drum wind-dried）.The bulk density for drum wind-dried powder was the highest amongst these three.From these density values，flow ability of S-WPIs was measured by calculating Hausner ratio（HR）.HR was greater than 1.5，the powder is a powder adhesive，poor flow ability and filling；less than 1.2 indicates that the powder has good flow ability and filling[22].Drum wind powder showed“excellent”flow ability（HR=1.07）；the native S-WPIs would be classified in the“fair”category（HR=1.25）while freezedried and spray-dried S-WPIs may be classified in the“passable”category（HR=1.34 and 1.44）.While all the powders have shown flow ability complying with industry standard in generally.