Physico-mechanical and microstructural properties of semolina flour films as influenced by different sorbitol/glycerol concentrations

Figures & data

Figure 1. ζ-potential of semolina film forming solutions.

Table 1. Physical and barrier properties of semolina films incorporated with various sorbitol/glycerol concentrations.

Plasticizer (% w/w)	Thickness (mm)	MC (%)	Solubility (%)	WVP ×10^−7 (g. m/m^2. d. Pa)	OP [cc.mil/(m².day.atm)]
30	0.132 ± 0.008^c	7.02 ± 0.42^c	37.51 ± 2.54^b	8.97 ± 0.42^a	2.24 ± 0.095^a
40	0.139 ± 0.008^b	8.04 ± 0.37^b	40.52 ± 3.03^ab	8.82 ± 0.29^a	2.21 ± 0.10^a
50	0.144 ± 0.005^a	8.82 ± 0.52^a	45.14 ± 2.01^a	8.01 ± 0.30^b	2.03 ± 0.04^b

Values are mean (n = 5) ± SD. Different letters in each column represent significant difference at the 5% level of probability among semolina films.

Table 2. Apparent colorimetric parameters of semolina films incorporated with various sorbitol/glycerol concentrations.

Plasticizers (% w/w)	L*	a*	b*
30	93.14 ± 0.102^c	−0.78 ± 0.085^a	3.66 ± 0.05^c
40	93.44 ± 0.065^b	−0.78 ± 0.015^a	3.83 ± 0.03^b
50	94.84 ± 0.02^a	−0.79 ± 0.018^a	4.06 ± 0.12^a

Values are mean ± SD (n = 5). Different letters in each column represent significant difference at the 5% level of probability among semolina films.

Table 3. Light transmission (%) values of semolina films incorporated with various sorbitol/glycerol concentrations.

	Light transmission at different wavelengths (%)
Plasticizer (% w/w)	200	280	350	400	500	600	700	800
30	0.00	0.08	12.01	22.30	31.00	34.59	37.04	39.09
40	0.00	0.31	13.62	19.04	25.46	28.30	30.53	32.64
50	0.00	0.99	14.75	18.67	24.84	27.28	29.22	31.11
LDPE*	13.10	67.50	79.90	83.40	85.60	86.90	87.80	83.60
OPP*	4.60	80.00	86.20	87.90	88.80	89.10	89.30	89.60
PE*	0.30	0.30	68.30	73.60	82.10	83.50	84.20	84.90

*LDPE, low density polyethylene; *OPP, Oriented polypropylene, *PE, polyethylene. Data obtained from Ramos et al. [32]

Figure 2. Tensile strength (A), elastic modulus (B), and elongation-at-break (C) of the semolina films incorporated with various sorbitol/glycerol concentrations. Different letters means significant differences (p <0.05).

Figure 3. FTIR spectra of the semolina films incorporated with various sorbitol/glycerol concentrations.

Figure 4. TGA of the semolina films incorporated with various sorbitol/glycerol concentrations.

Figure 5. Three-dimensional AFM topographic images of semolina film with (a) 30, (b) 40 and (c) 50% plasticizers (sorbitol/glycerol). Mean values with different superscript in small letters for Ra and in capital letters for Rq are significantly different (p < 0.05).

Hoque, M. S.; Benjakul, S.; Prodpran, T.; Songtipya, P. Properties of Blend Film Based on Cuttlefish (Sepia pharaonis) Skin Gelatin and Mungbean Protein Isolate. International Journal of Biological Macromolecules 2011, 49, 663–673. DOI: 10.1016/j.ijbiomac.2011.06.028.

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