Abstract :
ABSTRACT
Muhamad Rizal. B.1510201. Ice Milk Stability and Sensory on 4000 L Tank
Capacity with Different Ageing Time and Agitation Speeds. Supervised by
Aminullah and Siti Aminah.
Ice milk are one of the low-fat ice cream-based dairy products. The objective of
this research was to study the effect of different aging times and agitation speeds
on the stability and sensory ice milk on a larger scale. This research used Factorial
Completely Randomized Design (CRD) with two factors consisted of ageing time
with three treatment levels of 4 h, 24 h and 48 h and agitation speed with two
treatment levels of 35 rpm and 45 rpm, with three replications. The product
analysis included physical tests (fat globule, viscosity, and phase separation tests),
chemical tests (total solids and fat content) and organoleptic tests (difference from
control tests and quantitative descriptive analysis/QDA®
). The results of the study
showed that in general longer ageing time and faster agitation speed did not
significantly influenced fat globule, viscosity, total solids, and fat content.
However, it was founded that the longer aging time (48 hours) and the agitation
speed of 45 rpm tends to reduce the phase of separation that occured. In general,
the ageing time and agitation speed produce a consistent quality of ice milk, and
are strengthened by the results of sensory evaluation of difference from control
test methods, ice milk detected differently was determined based on the overall
sensory attributes between the blind control sample and the treatment sample that
are 4 hour ageing time treatment; agitation speeds of 35 rpm (A1B1) and 45 rpm
(A1B2), followed by quantitative descriptive analysis (QDA®
) of 10 sensory
attributes only obtained coarse texture at 4 hours of ageing with agitation speed of
35 rpm.
Keywords: ageing time, agitation speed, ice milk, sensory, stability.