Table 7. Changes in yield, acid value, peroxide value and optical density (OD) affected by different concentrations of clay acid

Contents ofclay acid (%)	Yields(%)	Acid value(mg KOH/g)	Peroxide value(meq/kg)	OD(480 nm)
Deacidified oil	100±0.00a1)	0.27±0.02a	17.91±0.20a	1.06
1	94.92±0.13b	0.21±0.01b	17.65±0.21a	0.44
2	93.70±0.12c	0.20±0.01bc	15.80±0.05b	0.24
3	93.57±0.14c	0.20±0.01bc	14.34±0.42c	0.16
4	92.14±0.18d	0.18±0.01c	11.77±0.18d	0.13
5	91.05±0.16e	0.14±0.01d	9.24±0.94e	0.10

Values are mean±SD (n=3). Means with the different letters in the same column are significantly different (p<0.05).