In a large saucepan, mix milk and cream in a saucepan and gently heat to 45°C.
In a small bowl, mix together glucose and a splash of the warm cream mixture. Stir until incorporated. Add the glucose mixture back to the pan.
Mix together milk powder, sugar and dextrose and whisk them into the milk mixture. Keep whisking to dissolve any lumps. Bring the mixture to 85°C and cook out for 5 minutes, stirring continuously. Stir in the mango puree and mix well.
Prepare an ice bath by filling a large bowl with ice and cold water (a metal container will chill faster than glass or plastic). Transfer the gelato base to a bowl and set over the ice bath. Whisk until cool.
Chill the gelato base in the fridge overnight.
Put the cooled gelato base in your ice cream maker and churn according to the machine instructions.
Transfer the gelato to an airtight freezer safe container and freeze for 2-3 hours before serving.