Fruit Leather Development: Processing, Formulation and Commercial Production of Fruit Bars and Aam Papad (2026)

Key Takeaways

• Three things preserve fruit leather. Low moisture of 15 to 25%, the fruit's natural acidity and a high sugar content keep it shelf-stable, for up to 9 months when properly dried and packed (FAO).
• Dry at about 60°C, not hotter. Drying at 70°C was faster but darkened the leather and made it chewier; 60°C gave the best quality (MIT ADT University).
• Sugar is a recipe lever. FAO's mango leather method adds sugar at 10 to 15% of pulp weight, depending on variety and taste (FAO, same source).
• Spread thickness sets drying time. FAO's method pours hot puree at 15 kg per square metre of tray (same source); thicker layers dry slowly and unevenly.
• Storage heat causes browning. Mango and pineapple leathers stored at 35°C browned more than those at 25°C (Revista Facultad Nacional de Agronomía Medellín), so packaging and cool storage matter.