Table 8.
Color analysis (L*, a*, and b* values) of fresh, used and treated oils with different lignocellulosic biomasses; including corn cob (CC), cornstalk piths (CP), and sugarcane bagasse (SC); 4, 12, and 20 means the frying period by (h, hours). Means with different letters (a, b, c, d) within each column indicate statistically significant differences between the samples after Duncan’s analysis (p < 0.05).
| Frying Time (h) | Samples | L* | a* | b* |
|---|---|---|---|---|
| 0 | Fresh oil | 40.91 ± 0.32 a | −1.69 ± 0.03 c | 7.38 ± 1.21 d |
| 4 | Used oil | 38.79 ± 0.41 a | −1.74 ± 0.04 c | 13.27 ± 2.34 c |
| CC-treated oil | 39.47 ± 0.65 a | −1.70 ± 0.02 c | 13.32 ± 2.12 c | |
| CP-treated oil | 39.29 ± 0.43 a | −1.98 ± 0.02 c | 14.57 ± 1.84 b,c | |
| SC-treated oil | 40.30 ± 1.23 a | −1.96 ± 0.03 c | 14.37 ± 2.47 c | |
| 12 | Used oil | 36.82 ± 0.95 a | 0.49 ± 0.06 a,b,c | 17.65 ± 1.59 a,b |
| CC-treated oil | 36.94 ± 0.56 a | 0.78 ± 0.05 a,b,c | 19.23 ± 0.12 a | |
| CP-treated oil | 36.68 ± 0.77 a | 0.56 ± 0.06 a,b,c | 17.68 ± 0.36 a,b | |
| SC-treated oil | 36.62 ± 0.84 a | 0.25 ± 0.02 b,c | 17.90 ± 0.83 a,b | |
| 20 | Used oil | 35.96 ± 0.92 a | 1.78 ± 0.08 a,b | 18.60 ± 0.32 a |
| CC-treated oil | 35.29 ± 0.75 a | 3.31 ± 0.21 a,b | 17.76 ± 0.89 a,b | |
| CP-treated oil | 35.55 ± 0.54 a | 3.71 ± 0.33 a | 18.52 ± 1.10 a | |
| SC-treated oil | 38.51 ± 0.42 a | 2.38 ± 0.16 a,b | 20.84 ± 0.97 a |