Determining the Effects of High Intensity Ultrasound on the Reduction of Microbes in Milk and Orange Juice Using Response Surface Methodology

Table 2

Estimated regression model of the relationship between response variable () and independent variables (, , and ).

	Bacteria in milk		Spores in milk		Yeasts in OJ
	-value	Prob.	-value	Prob. >	-value	Prob. >
= time	3.84	0.0735	5.63	0.0352	0.18	0.6775
= temperature	78.62	0.0001	53.58	0.0001	3622.7	0.0001
= amplitude	9.50	0.0095	59.02	0.0001	692.53	0.0001
	0.28	0.6034	8.15	0.0145	1.06	0.3241
	0.46	0.5086	0.12	0.7315	0.00	1.0000
	1.87	0.1961	2.09	0.1741	0.18	0.6775
	13.24	0.0034	10.51	0.0070	627.98	0.0001
	0.025	0.8776	9.40	0.0098	106.64	0.0001
	6.75	0.0233	4.28	0.0607	81.85	0.0001

= time (min), = temperature (°C), = amplitude, and = log reduction.