Proximate composition of banana pseudostem
The results for the proximate composition of raw banana pseudostem as shown in Table 2. The banana pseudostem shows a moisture of 96.02±0.21, protein of 2.5±0.12, ash content of 0.3±0.05 and crude fiber of 15.5±0.24. The moisture content of 96.02% was more related to the value reported by
(Dawn et al., 2016). This may be due to the banana pseudostem species. The protein content of banana pseudostem (
Musa acuminata) was found to be 2.5% on a wet weight basis. The obtained result was similar to the result reported by
(Bhaskar et al., 2011). The ash content of the banana pseudostem was 0.3% and the similar values were reported for the banana pseudostem by
(Bhaskar et al., 2011). The crude fiber of the banana pseudostem was 15.5%.
Physico-chemical properties of banana pseudo stem extract
The results of the physico–chemical properties of banana pseudostem extract were shown in Table 3. The total soluble solids and pH values in were 1°Brix and 5.25 respectively. These values were slightly different reported by (
Bornare and Sumaiya, 2015). The titratable acidity of banana pseudostem extract was 0.17g/100ml and similar values were obtained by (
Bornare and Sumaiya, 2015).
Storage studies of ready-to-drink banana pseudostem beverage incorporated with pineapple and grape extract
Changes in pH
The pH value of ready-to-drink banana pseudostem beverage incorporated with pineapple and grape extract stored at ambient (25°C) and refrigerated (4°C) during storage was shown in Fig 1. In the present study, the pH values of banana pseudostem beverage (V
0) stored at ambient (25°C) temperature during storage were found to be slightly increased from 5.25 to 6.00. The pH value of ready-to-drink banana pseudostem incorporated with pineapple beverage (V
1) and grape beverage (V
2) stored at ambient (25°C) and refrigerated (4°C) during storage. The pH values of V
1 and V
2 were found to be increased from 4.60 to 4.78 and 4.60 to 4.70 respectively. There is no significant difference between V
1 and V
2 during storage upto 12 days. The pH value of ready-to-drink banana pseudostem incorporated with pineapple beverage (V
3) and grape beverage (V
4) stored at ambient (25°C) and refrigerated (4°C) during storage. The pH values of V
3 and V
4 were found to be increased from 4.52 to 4.82 and 4.52 to 4.73 respectively.
The results showed that there was no significant (p<0.05) difference was noticed in pH values during storage conditions. The pH was slightly increased after 6
th day of the ambient (25°C) and refrigerated (4°C) storage conditions up to 12 days. In the present study, the banana pseudostem beverages of pH values were increased during storage which might be due to a decrease in titratable acidity and the similar results were reported by
(Buvaneshwari et al., 2020). (Islam et al., 2014), in his study revealed that there was a significant increase in pH (5.6) during the storage period. This might be due to increase in titratable acidity and pH are inversely proportional to each other. (
Hirdyani, 2015), reported that there was a significant decrease in pH during storage.
Changes in titratable acidity
The titratable acidity of banana pseudostem stored at ambient temperature was shown in Fig 2. The titratable acidity of banana pseudostem beverage (V
0) stored at ambient temperature during storage was found to be decreased from 0.19 to 0.14g/100ml. The titratable acidity of RTD banana pseudostem incorporated with pineapple beverages stored at ambient and refrigerated storage conditions (V
1 and V
2) was found to be decreased from 0.64 to 0.52 and 0.64 to 0.55 g/100ml. There was no significant difference between V
1 and V
2 during storage up to 12 days. The titratable acidity of V
3 and V
4 were found to be decreased from 0.56 to 0.51 and 0.57 to 0.51g/100ml. In an initial storage condition, no significant difference (p<0.05) was present in the titratable acidity of the samples during ambient (V
1 and V
3) and refrigerated (V
1 and V
4) storage conditions. There was no significant difference between V
3 and V
4 during storage up to 12 days. In the present study, the titratable acidity values of all samples were decreased during storage due to decreasing concentration of pineapple and grape extract in the respective blends and similar reports were obtained by (
Bornare and Sumaiya, 2015). The titratable acidity of banana pseudostem beverage was decreased during storage and this might be due to the conversion of acids into salts and sugars by enzymes particularly invertase and similar results have been reported by
(Buvaneshwari et al., 2020); (
Bornare and Sumaiya, 2015).
Changes in total soluble solids
The total soluble solids of ready-to-drink banana pseudo stem beverage incorporated with grape extracts were stored at ambient (25°C) and refrigerated (4°C) temperature during storage were shown in Fig 3. The total soluble solids of banana pseudostem beverage (V
0) stored at ambient temperature during storage were found to be 9.00 to 9.00 °Brix. The results indicated that the total soluble solids of ready-to-drink banana pseudostem beverage incorporated with pineapple extracts were stored at ambient (25°C) and refrigerated (4°C) temperature during storage for up to 12 days. The total soluble solids of V
1 and V
2 were 8.00 to 8.00 °Brix and 8.00 to 8.00 °Brix respectively. There was no significant difference between V
1 and V
2 during storage up to 12 days.
The total soluble solids of ready-to-drink banana pseudostem beverage incorporated with grape extracts were stored at ambient (25°C) and refrigerated (4°C) temperature during storage up to 12 days were shown in Fig 3. The total soluble solids of V
3 and V
4 were 8.00 to 8.00 °Brix and 10.00 to 10.00 °Brix respectively. There is no significant difference between V
3 and V
4 during storage up to 12 days.
(Shiva et al., 2018) reported the total soluble solids of RTD beverage gradually increased with the values of 12 °Brix to 13.8 °Brix during storage up to 6 months. The total soluble solids were increased with the gradual passage of storage time which might be due to the hydrolysis of polysaccharides into monosaccharides and oligosaccharides (
Hirdyani, 2015). Banana pseudostem beverage revealed that juice blends found an increasing trend in total soluble solids during storage at ambient and low temperatures in lime- aonla and mango pineapple spiced RTS beverages (
Jan and Masih, 2012). In the present study, RTD banana pseudo stem beverage of TSS values was constant during storage for up to 12 days due to the shorter storage period.
Changes in viscosity
The viscosity of banana pseudostem beverage incorporated with pineapple and grape extracts during storage was presented in Table 4. The viscosity of banana pseudostem beverage (V
0) stored at ambient temperature during storage was found to be decreased from 177.00 to 130.00 mpa.s. up to 12 days. The viscosity of V
1 and V
3 were found to decreased from 185.00 to 100.00 and 145.60 to 85.00 mpa.s respectively.
The viscosity of ready-to-drink banana pseudostem beverage incorporated with pineapple and grape extract was stored at refrigerated (4°C) temperature during storage up to 12 days. The viscosity of V
2 and V
4 were found to increase from 185.00 to 220.00 and 145.60 to 180.00 mpa.s respectively. In the present study, there was a significant difference between the viscosity of V
1 and V
3 samples were decreased, V
2 and V
4 samples were increased during storage up to 12 days.
Changes in Color
The color of the ready-to-drink banana pseudostem is an important attribute for the organoleptic acceptability of the product. The color of banana pseudostem beverage incorporated with pineapple and grape extracts was stored at ambient temperature as shown in Fig 4.1, 4.2 and 4.3. The result values were obtained by absorbance i.e., the maximum absorbance shows the color of the product. The banana pseudostem beverage (V
0) had maximum light absorbed at 490nm during a storage period of up to 12 days, the results showed that the banana pseudostem beverage was blue-green. The absorbance value differs on wavelength this might be due to the browning of the beverage. The V
1 and V
2 samples had maximum light absorbed at 520nm during a storage period of up to 12 days, the results showed that the product was green-yellow. There was no significant difference between V
1 and V
2 samples during storage up to 12 days. The V
3 and V
4 samples had maximum light absorbed at 460nm during a storage period up to 12 days, the results showed that the product was violet-blue in color. There was no significant difference between V
3 and V
4 samples during storage up to 12 days. In the present study, significant changes occur in (V
1, V
2) and (V
3, V
4) samples during storage up to 12 days due to the maximum absorbance of light and wavelength.
Sensory analysis
The results of the sensory analysis of ready-to-drink banana pseudostem beverage incorporated with pineapple and grape extract were evaluated by 50 semi-trained panelists based on their appearance, color, flavor, mouthfeel, taste and overall acceptability were shown in Table. 5. The highest scores of 7.68 and 7.77 indicated that the color and appearance of ready to drink banana pseudostem beverage incorporated with grape extract (V
3) were rated best by the sensory panel and similar results were observed by
(Ravi et al., 2011). The highest scores of 7.77, 7.81 and 7.95 indicated that the flavor, mouthfeel and taste of ready-to-drink banana pseudostem beverage incorporated with pineapple extract (V
1) were rated best by the sensory panel because sourness of pineapple extract. The overall acceptability score of ready-to-drink banana pseudostem beverage incorporated with pineapple (V
1) was preferred by panelists.
Microbiological analysis
The total plate count,
E.coli, yeast and mould of banana pseudostem beverage incorporated with pineapple and grape extract were stored at ambient temperature for up to 12 days were shown in Table 6. Initially there was no microbial count observed in the developed banana pseudostem beverage samples, there was no bacterial, fungi and mould growth observed in the refrigerated and ambient temperature samples throughout their shelf life of 12 days. In the case of the ambient condition stored samples, there was no growth seen over the 12-day storage period. After that, there was no fungi and mould growth were seen in the storage period of up to 12 days. In the present study, the results showed that no microbial count was observed for up to 12 days and similar results were observed by
(Buvaneshwari et al., 2020). FSSAI (2017) reported that the microbiological requirements of fruit beverages, carbonated beverages and ready to serve beverages including fruit beverages were not more than 50 CFU/ml for TPC, not more than 2 CFU/ml for YMC (
FSSAI, 2017). The results indicated that the microbial quality of banana pseudostem beverage, V
1, V
2 and V
4 samples were satisfactory. It remained fresh up to 12 days at ambient and refrigerated conditions and it was safe for human consumption.