The TSS contents of the enzyme liquefied purees
were measured by a portable hand refractometer
(Atago®, Japan) with a scale of 0-32°Brix. The
pH value was measured using a digital pH meter
(Jenway, model 3505, UK) and the moisture content
of the powders were determined based on AOAC
(1984) method. The water activity of the samples was
measured by using a water activity meter (Novasina,
Labmaster, Switzerland) at 25±1.0°C.