Influence of pre-crystallisation and water plasticization on flow properties of lactose/WPI solids systems

Abstract

This study investigated the influence of pre-crystallisation and water plasticization on flow properties of lactose/ whey protein isolate (WPI) solids systems. Powder characteristics of lactose/WPI mixtures with different amount of α-lactose monohydrate (1.01%, 11.18%, 29.20%, and 46.84%, w/w) were studied. Dairy powders with higher amounts of crystalline lactose showed larger tapped bulk density and particle density. Morphological characteristics study indicated dairy solids with higher crystallinity had less rounded shape and rougher surface. Increasing protein content or crystalline lactose content could decrease the molecular mobility of dairy solids. Flow function tests indicated that dairy solid with 11.18% crystallinity was more easy-flowing than lactose/WPI mixtures with 1.01%, 29.20% and 46.84% crystallintiy at 0% and 44% relative humidity (RH) storage conditions. Furthermore, dairy solids with higher amount of crystalline lactose showed better resistance to develop cohesive at high RH storage conditions. The friction angle of dairy solid with 1.01% crystallinity increased with increasing water content, while friction angles of lactose/WPI mixtures with higher crystallinity decreased with increasing water content.

Breakage of infant milk formula through three different processing methods and its influence on powder properties

“…The specific bulk volume and how it is influenced by consolidation is an important powder functionality, as it influences the storage volume required to store a given mass of powder. Furthermore, for infant formula, the specific bulk volume influences the size of product containers and the scoop volume requirement for the preparation of infant milk (Hanley, 2011;Li et al, 2016a). The loose specific bulk volume is presented in Table 2 (This is the inverse of loose bulk density).…”

An investigation into the flowability of fine powders used in pharmaceutical industries

“…Also, low friction between the particles will facilitate in easier rearrangement of the particles more easily, which in turn would result in a higher; packing fraction and bulk density [19]. Porosity [20,21] and compressibility index [22] were determined using the following formulae:…”