Table 2.

Effect of rice protein concentrate (RPC) coatings enriched with essential oils tea tree (TEA), copaiba (COP), or thymo (THY) on Haugh unit (HU) and egg grade¹ (designated after each mean. in the parenthesis) during 6 wk of storage at 20°C.^²

Week	Control	RPC	RPC+TEA	RPC+COP	RPC+THY
0	81.99(AA) ± 0.39A,a	81.99(AA) ± 0.39A,a	81.99(AA) ± 0.39A,a	81.99(AA) ± 0.39A,a	81.99(AA) ± 0.39A,a
1	79.62(AA) ± 0.45B,a	81.10(AA) ± 0.52B,b	81.36(AA) ± 0.36A,b	81.19(AA) ± 0.61A,B,b	81.23(AA) ± 0.63A,B,b
2	75.28(AA) ± 0.34C,c	78.43(AA) ± 0.32C,b	80.23(AA) ± 1.13B,a	80.52(AA) ± 1.44B,a	80.23(AA) ± 0.84B,a
3	70.92(A) ± 0.55D,b	76.92(AA) ± 0.36D,a	77.21(AA) ± 1.14C,a	77.60(AA) ± 0.67C,a	77.50(AA) ± 0.92C,a
4	66.47(A) ± 0.53E,c	71.90(A) ± 0.40E,b	77.17(AA) ± 0.58C,a	77.07(AA) ± 0.40C,a	77.23(AA) ± 0.76C,a
5	63.29(A) ± 0.49F,c	68.58(A) ± 0.48F,b	74.06(AA) ± 0.58D,a	72.12(AA) ± 2.40D,a	73.90(AA) ± 1.16D,a
6	58.46(B) ± 0.52 G,c	61.47(A) ± 0.62 G,b	71.53(A) ± 0.75E,a	71.67(A) ± 2.90D,a	72.76(AA) ± 1.30D,a

^¹Egg grades: AA. HU > 72; A. HU = 71–60; B. HU = 59–31; C. HU < 30.

²Data are expressed as means (egg grades) ± standard deviations. Information was collected in 12 eggs per treatment. Statistical models included the effects of treatments (P < 0.001), storage periods (P < 0.001), and interaction (treatments by storage periods, P < 0.001).

^a-dMeans in the same row with different lowercase letters are significantly different (P < 0.001).

^A-DMeans in the same column with different capital letters are significantly different (P < 0.001).