*Ome, A.P.1, Okeke-Okoye,
C.J.2 and Ifediba, D.I.3
1’2Department of Food Science and Technology,
Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria.
3Department of Agricultural
Technology/Processing, Anambra State Polytechnic, PMB 002 Mgbakwu, Anambra
State, Nigeria.
*Email: talk2omepeter@gmail.com
ABSTRACT
The study was
conducted to evaluate and compare the quality of yoghurts produced from blends
of whole milk and soybean powder. Soybean powder was prepared from ground
soybean seeds. Four samples of yoghurt product were used, namely; 100% whole
milk powder, 30:70, 50:50 and 70:30 (soybean powder: whole milk powder) and analysed
for physicochemical, proximate, and sensory properties. The results of the
physicochemical properties of the samples ranged as follows: pH,total solid and
total titratable acidity expressed as percent lactic acid 4.40 – 4.70, 10.33 –
13.30 and 0.46 – 0.64, respectively. There was no appreciable difference
(P>0.05) in the physicochemical properties of the samples. The
proximate composition of all the yoghurt
samples had different levels of protein content (3.24%,
3.41%, 3.59%, 3.76%) respectively. Fat content (2.90% – 3.60%), moisture
content (88.10% – 88.70%), ash content (0.50% – 1.00%) and carbohydrate content
(3.14% – 5.44%), with Sample D (70% soybean powder, 30% whole milk powder blend)
having the highest values in protein, ash contents, moisture and carbohydrate
contents. The sensory evaluation showed that there was no significant
difference (P>0.05) in texture and overall acceptability of the samples.
However, there were significant differences in appearance, taste and flavour of
the samples. Results from this study have demonstrated a further way of
enhancing soy yoghurt production and acceptability.
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