Tray dried gluten free smoothie mix powder: A nutrient dense ready to reconstitute beverage

An instant smoothie powder was developed using tray-drying technology with oats (40%) and foxtail millet (30%) as the main ingredients. Honey was used as a natural sweetener, without the inclusion of any preservatives or artificial colouring agents. The product demonstrated high sensory acceptability, achieving an 85% likeness score. It exhibited low moisture content (5%) and reduced water activity, contributing to improved microbial stability and an extended shelf life. Rich in crude fibre, the powder serves as a potential dietary fibre source, with the tray-drying process (conducted at 60°C for 5 hours) preserving the nutritional integrity of the ingredients. The reconstitution ability of the powder was confirmed with a solubility rate of 94%, indicating excellent instant mixing characteristics. SEM (Scanning Electron Microscopy) analysis revealed the powder’s rheological behaviour and surface morphology, highlighting its high hygroscopic nature which increases the risk of lump formation. This drawback can be mitigated through the addition of anti-caking agents and use of properly sealed packaging. The product is best reconstituted in a 1:2.5 (powder: water) ratio, providing a desirable consistency. While no additional sweetener is required, users may optionally enhance sweetness by adding sugar or drizzling honey. With its high nutritional value, excellent solubility, and convenience, this smoothie powder represents a healthy and ready-to-use beverage option for modern consumers.