Water activity of spray dried powder

Hello everyone.

Now I am doing my research based on maltodextrin concentration on spray dried powder.

The result obtained  was increasing trends. However, when I refer on previous journals, it should be decreasing trend. 

Thus, is there any 'evidence' or supporting details to support the result?

Thank you :)

Dear Rossy,

can you describe it more clear.. so we can see the problems more clear..

Rgds

AS Nur

Thank you for replying.

Currently I am doing research on effect of microcapsulation on herbs by using spray drying and freeze drying.

One of the characteristics that I investigate is water activity of powder.

For your information, the concentration of maltodextrin used for my research are 5%, 10% and 15% for spray drying and freeze drying. However, the final results showed that the water activity are increasing from concentration of maltodextrin 5% until 15%. According to previous study,the results showed the water activity should be decreased as increasing of concentration of maltodextrin.

Is it clear? :)

Thank you :)

Dear Rossy,

what is your intention of measuring water activity in powders? Microbiology?

Rgds

moskito