Purple rice was washed and soaked overnight at room
temperature. It then was steam cooked and washed again
with boiled water. A 0.3% w/w starter culture was added to
cooked and dry purple rice. It was incubated at 37°C for 3
days. The purple rice was blended and filtrated with a cotton
sheet. The filtrate was centrifuged at 5,000 rpm 0, 5, 10, 15
and 20 min and then added with 30% sucrose syrup in a ratio
of 1:1. HBFP were stored in a refrigerator until test.