Optimization of drying parameters for mango seed kernels using central composite design

Bioresources and Bioprocessing

Table 1 Central composite design: coded variables, real variables, and responses

Number	Coded variables		Real variables		Responses
	Coded variables		Real variables		Moisture (%)			Oil content (%)			Total polyphenols (% DM)			Antioxidant activity (eq g of VitC/100 g DM)
	x ₁	x ₂	X ₁	X ₂	Exp	Cal	Res	Exp	Cal	Res	Exp	Cal	Res	Exp	Cal	Res
1	−1.00	−1.00	44.85	13.64	16.59	17.86	−1.27	9.14	9.05	0.09	0.99	1.11	−0.12	477.12	581.02	−103.90
2	1.00	−1.00	75.15	13.64	10.36	10.30	0.05	8.78	8.68	0.11	0.37	0.41	−0.04	781.64	924.62	−142.98
3	−1.00	1.00	44.85	61.36	7.72	8.11	−0.39	9.16	9.32	−0.16	1.30	1.30	0.00	892.26	723.22	169.04
4	1.00	1.00	75.15	61.36	1.72	0.79	0.93	8.79	8.94	−0.15	1.05	0.97	0.08	2,326.22	2,196.42	129.80
5	0.00	0.00	60.00	37.50	4.80	5.79	−0.99	9.45	9.56	−0.11	0.86	0.94	−0.08	1,144.65	1,148.92	−4.27
6	0.00	0.00	60.00	37.50	6.31	5.79	0.52	9.42	9.56	−0.14	0.91	0.94	−0.03	1,164.00	1,148.92	15.08
7	0.00	0.00	60.00	37.50	4.91	5.79	−0.88	9.49	9.56	−0.07	0.81	0.94	−0.13	1,150.18	1,148.92	1.26
8	−1.32	0.00	40.00	37.50	12.35	11.16	1.20	9.16	9.12	0.04	1.29	1.21	0.08	708.29	753.06256	−44.78
9	1.32	0.00	80.00	37.50	0.53	1.34	−0.81	8.65	8.63	0.02	0.49	0.53	−0.04	1,966.91	1,952.15056	14.76
10	0.00	−1.32	60.00	6.00	18.61	17.75	0.86	8.92	9.08	−0.16	0.89	0.78	0.11	596.20	404.3872	191.81
11	0.00	1.32	60.00	69.00	4.56	5.03	−0.47	9.66	9.44	0.22	1.20	1.27	−0.07	1,116.10	1,337.6272	−221.53
12	0.00	0.00	60.00	37.50	4.77	5.79	−1.02	9.39	9.56	−0.16	1.07	0.94	0.13	1,145.52	1,148.92	−3.40
13	0.00	0.00	60.00	37.50	6.41	5.79	0.62	9.83	9.56	0.27	0.92	0.94	−0.02	1,149.64	1,148.92	0.72
14	0.00	0.00	60.00	37.50	7.45	5.79	1.66	9.75	9.56	0.19	1.05	0.94	0.11	1,147.22	1,148.92	−1.70