Effect of Particle Size, Temperature, and Total Soluble Solids on The Rheological Properties of Watermelon Juice: A Response Surface Approach

Figures & data

Table 1 Central composite design arrangement for independent variables (Particle size, mm (X₁), temperature °C (X₂), TSS, °B (X₃)) and their responses (consistency coefficient, Pa sⁿ (k), flow behavior index (n)) (n = 3)

	Variables levels (uncoded)			Responses
Run	X1 (Particle size, mm)	X2 (Temperature, °C)	X3 (TSS, °B)	Experimental‘k’	Predicted ‘k’	Experimental ‘n’	Predicted ‘n’
1	−1(0.15)	−1(5)	−1(25)	0.241	0.239	0.864	0.702
2	1(0.355)	−1(5)	−1(25)	0.286	0.267	0.776	0.700
3	−1(0.15)	1(15)	−1(25)	0.178	0.189	0.949	0.821
4	1(0.355)	1(15)	−1(25)	0.196	0.157	0.867	0.746
5	−1(0.15)	−1(5)	1(55)	0.286	0.349	0.684	0.739
6	1(0.355)	−1(5)	1(55)	0.486	0.499	0.717	0.779
7	−1(0.15)	1(15)	1(55)	0.301	0.345	0.837	0.847
8	1(0.355)	1(15)	1(55)	0.410	0.436	0.717	0.813
9	−1.682 (0.075)	0(10)	0(40)	0.286	0.228	0.756	0.858
10	1.682(0.425)	0(10)	0(40)	0.305	0.328	0.838	0.756
11	0(0.25)	−1.682 (1.59)	0(40)	0.332	0.312	0.771	0.811
12	0(0.25)	1.682 (18.41)	0(40)	0.230	0.216	0.887	0.940
13	0(0.25)	0(10)	−1.682 (14.77)	0.185	0.226	0.281	0.539
14	0(0.25)	0(10)	1.682 (65.23)	0.628	0.552	0.792	0.627
15	0(0.25)	0(10)	0(40)	0.349	0.312	0.757	0.756
16	0(0.25)	0(10)	0(40)	0.285	0.312	0.758	0.756
17	0(0.25)	0(10)	0(40)	0.2861	0.312	0.757	0.756
18	0(0.25)	0(10)	0(40)	0.397	0.312	0.763	0.756
19	0(0.25)	0(10)	0(40)	0.278	0.312	0.764	0.756
20	0(0.25)	0(10)	0(40)	0.270	0.312	0.756	0.756

Figure 1 Effect of particle size and temperature on consistency coefficient ‘k’ of watermelon juice having TSS of 40°B.

Figure 2 Effect of particle size and total soluble solids on consistency coefficient ‘k’ of watermelon juice at 10°C.

Figure 3 Effect of temperature and total soluble solids on consistency coefficient ‘k’ of watermelon juice having particle size of 0.25 mm.

Figure 4 Effect of particle size and temperature on flow behavior index ‘n’ of watermelon juice having TSS of 40°B.

Figure 5 Effect of total soluble solids and particle size on flow behavior index ‘n’ of watermelon juice at 10°C.

Figure 6 Effect of total soluble solids and temperature on flow behavior index ‘n’ of water melon juice having particle size of 0.25 mm.