Fruit powders are made in three main ways. Spray drying sprays liquid pulp or juice into hot air. Freeze drying freezes the fruit and removes the ice under vacuum. Drum drying spreads a thin layer of pulp on a heated drum and scrapes it off as flakes.
A fourth route is to dry fruit slices in hot air and then mill them. Each method gives a different powder in colour, flavour, solubility, fruit content and cost. Knowing the method helps you compare quotes fairly.
Spray drying
The fruit is first made into a liquid, usually pulp or juice, and often blended with a carrier such as maltodextrin. This liquid is atomised into fine droplets inside a tall chamber of hot air. The water evaporates in seconds, and a fine powder collects at the bottom.
Spray-dried powders are fine, free-flowing and dissolve well, which suits drink mixes. The carrier is needed because fruit sugars become sticky when hot. This means the powder is often well under full fruit content. Spray drying is efficient at large scale, so it is usually the lowest-cost route.
Freeze drying
The fruit, as pieces or pulp, is frozen and then placed under vacuum. The ice turns straight to vapour without melting. Because the product is never heated much, colour, aroma and nutrients are well kept. Freeze-dried powders can often be made without a carrier.
Freeze drying is slow and uses a lot of energy, so it is the most expensive method. The powder is also very hygroscopic and needs good moisture barrier packing.
Drum drying
Pulp is spread as a thin film on a rotating heated drum. It dries in a single turn and is scraped off as flakes, which are milled into powder. Drum drying works well for thick pulps such as banana and mango.
The direct heat can give a slightly cooked flavour and darker colour. Drum-dried powders tend to be coarser and less soluble than spray-dried ones. The same comparison for vegetables is in spray-dried versus drum-dried vegetable powders.
Comparing the methods
- Flavour and colour: freeze-dried best kept, then spray-dried, then drum-dried, as a general rule.
- Carrier: common in spray-dried, sometimes in drum-dried, often not needed in freeze-dried.
- Solubility: spray-dried usually best for drinks.
- Texture: spray-dried fine, drum-dried and milled powders coarser.
- Cost: spray and drum drying usually lower, freeze drying highest.
- Moisture sensitivity: all fruit powders absorb moisture, freeze-dried especially.
Questions to ask a supplier
- Which drying method do you use, and in your own plant or a contract dryer?
- What carrier is added, and what is the fruit solids percentage?
- What are the typical moisture and water activity at packing?
- What packing do you use to protect against moisture?
The range of fruits on offer is covered in what fruit powders you can source from India.
Where we come in
We visit the drying plant to confirm the method and carrier used. We have samples tested at NABL-accredited labs and help you compare quotes on the same fruit content. Ask for a free sourcing review.