## 3 Results
### Water Vapor Permeability (WVP)  
The WVP results of the films (Figure 6a) showed values between 0.1057 and 1.8657 g\(\cdot\)mm/kPa\(\cdot\)h\(\cdot\)m\({}^{2}\). A fairly strong positive relationship with a correlation coefficient of 0.8 was observed between WVP values and film thickness. The lowest value found in Sample 17 showed a thickness of 66.43 \(\upmu\)m while the highest vapor flux through the film was found at Sample 11 with 147.3 \(\upmu\)m thickness made of 30 mL PJ (3.73 g dw.), 1 g BG, 0.6 g SA [37]. The WVP results of the \(\beta\)-glucan/cranberry juice films (between 0.3523 and 0.3782 g\(\cdot\)mm/kPa\(\cdot\)h\(\cdot\)m\({}^{2}\)) are higher than \(\beta\)-glucan/bilberry juice films but in comparison with the scientific literature, [PERSON] et al., (2021) after the development of films based on cranberry extract and chitosan for the antibacterial properties found values between 3.71 and 4 (\(\times 10^{-12}\) mol\(\cdot\)m/m\({}^{2}\)\(\cdot\)s\(\cdot\)Pa) [51]. Owning that 1 mole of water weighs 18.01 g we can deduce that the values found for WVP by the authors were between 0.2405 and 0.2593 g\(\cdot\)mm/kPa\(\cdot\)h\(\cdot\)m\({}^{2}\), close to our values. [PERSON] et al., 2016 determined that a high pomergnate juice content in films will increase WVP values due to the plasticizing effect of sugars by adding significant amounts of juice and decreasing the concentration of the polymer matrix that weakens the films. The highest value found in that study was 10.91 g\(\cdot\)mm/kPa\(\cdot\)h\(\cdot\)m\({}^{2}\)[55]. Of course, by all of three types of films made, it was found that the highest value of WVP was found in films based on pomergnate juice with 1.8657 g\(\cdot\)mm/kPa\(\cdot\)h\(\cdot\)m\({}^{2}\) and 30 mL juice added. An innovative aspect that improved water vapor permeability was the addition of \(\beta\)-glucans to the films of various juices. It was observed in previous studies on films made of \(\beta\)-glucan/pullulan that the WVP values does not exceed 1.2 g\(\cdot\)mm/kPa\(\cdot\)d\(\cdot\)m\({}^{2}\)[56]. In addition, films made of cranberry pomace  
Figure 5: **(a) WVTR tendency of the \(\beta\)-glucan, sodium alginate and juices films; (b) Experimental model of dry cup with CaCl\({}_{2}\) as desiccant according to ASTM (4 mm air gap). Values followed by different letters are significantly different at \(p<\) 0.05.**  
extract, low methoxyl pectin, and glycerin showed increased values of 68.5 g\(\cdot\)mm/kPa\(\cdot\)d\(\cdot\)m\({}^{2}\) (2.85 g\(\cdot\)mm/kPa\(\cdot\)h\(\cdot\)m\({}^{2}\)) compared to our samples that included \(\beta\)-glucans [57].  
Based on the five stages for the gas transport described by [PERSON] and Park (a diffusion surface layer of the side with higher concentration of penetrants, the absorption of the gas, diffusion the gas through the polymer of a certain thickness, desorption of the gas to the side with lower concentration of penetrant and diffusion of the gas [58]) in films based on pomerangates, bilberries, and cranberries juice, the composition and thickness of the layer are the only parameters that differs, whereas the rest of the parameters such as the surface of the film and the pressure on the two layers remained the same.  
However, another factors that affects the WVP values between samples are represented by the integrity of the film, hydrophilic-hydrophobic ratio, crystalline-amorphous ratio, or the polymeric chain mobility [60]. In the present study, in all 27 samples the FFS was a homogeneous mixture and the films showed uniformity, without coarse particles or air bubbles in the mass of the film. The plasticizer with the hydrophilic nature (glycerin) was kept at 25% from total solids while the addition of soybean oil did not show linear association with WVP (r = 0.09). The main use of glycerin was to impart flexibility and enhance toughness for films. In the absence of a plasticizer, the longitudinal microcracks visible in the cross-section of Figure 6b can initiate and over time it can lead to film breakage [61; 62].