Question

Which of the following comes under the categories of food – broken curve heating food?

(a) Evaporated milk

(b) Fruits packed without water/syrup

(c) Syrup packed with sweet potatoes

(d) All of the mentioned

I got this question in an international level competition.

The doubt is from Principles of Food Preservation by Canning-3 in section Principles of Food Preservation by Canning and Drying and Principles of Food Concentrates of Food Engineering

Answer 1

The correct choice is (c) Syrup packed with sweet potatoes

For explanation I would say: In syrup packed with sweet potatoes, the heat transfer is through convection initially. But when the starch particles from the solids separate, they retard the heat transfer.