Agrofood Waste and By-Product Valorization, Extraction, and Characterization of Pectin from the Waste Biomass Fruit Peel of Aframomum angustifolium Using Response Surface Methodology as Alternative Sources of a Functional Pectin

Table 5

Central composite design and response results for acid extraction.

Experimental runs	Experimental factors			Responses
	X1	X2	X3	Y1	Y2
	Temperature (^°C)	pH of acid	Time (min)	% yield	% DegE
1	70	3.68	85	4.33	48.7
2	53.18	2	85	4.00	60.3
3	70	2	85	5.23	63.5
4	80	3	120	4.83	68.5
5	70	2	143.9	5.50	68.8
6	60	3	50	4.03	57.3
7	86.82	2	85	5.43	56.3
8	70	2	26	3.07	56.9
9	70	0.32	85	5.37	48.4
10	80	3	50	4.00	59.3
11	60	1	50	4.93	53.1
12	80	1	50	5.17	50.5
13	80	1	120	5.93	46.1
14	60	1	120	5.67	51.3
15	70	2	85	5.20	61.3
16	60	3	120	4.93	66.7

X ₁ = temperature (^°C), X₂ = pH, X₃ = time (min), Y₁ = pectin yield (%), and Y₂ = degree if esterification (% DegE).