3.1.2. Physicochemical analyses
The pineapple pomace had a pH of 3.86 ± 0.07 (Table 3), which is similar to the pH of Gold pineapple (3.77) (Ramsaroop & Saulo, 2007), variety used in this study to obtain the pomace. The water activity of the samples averaged 0.14 ± 0.06 (Table 3) which is lower than those reported by Prakongpan, Nitithamyong, and Luangpituksa (2002) who found 0.24 for pineapple core dietary fibre and 0.28 for pineapple core cellulose. Considering the low pH and water activity of the material evaluated in this study, it has low risk of food deterioration by microorganisms, enzymes or nonezymatic reactions.Titratable acidity was quantified at 2.01 ± 0.23 g citric acid/100 g sample (Table 3). Costa, Felipe, Maia, Brasil, and Hernandez (2007) found 2.53% and 2.98% of citric acid in pineapple peel and pineapple pomace, respectively, values slightly higher than reported here. As most fruits mature, the acidity decreases, and the sugar content increases. Therefore, differences between acidity values may have been caused by variations in fruit ripeness and/or differences in pineapple varieties.
Processed and dried pomace was light in colour, i.e., high L* value (75.63 ± 3.07) (Table 3), which is a desirable attribute because ingredients with dark colours could limit potential food applications. Regarding the a* and b* colour parameters, the sample presented values of −0.1 ± 1.79 and 26.91 ± 2.35, respectively.
3.1.2. Physicochemical analysesThe pineapple pomace had a pH of 3.86 ± 0.07 (Table 3), which is similar to the pH of Gold pineapple (3.77) (Ramsaroop & Saulo, 2007), variety used in this study to obtain the pomace. The water activity of the samples averaged 0.14 ± 0.06 (Table 3) which is lower than those reported by Prakongpan, Nitithamyong, and Luangpituksa (2002) who found 0.24 for pineapple core dietary fibre and 0.28 for pineapple core cellulose. Considering the low pH and water activity of the material evaluated in this study, it has low risk of food deterioration by microorganisms, enzymes or nonezymatic reactions.Titratable acidity was quantified at 2.01 ± 0.23 g citric acid/100 g sample (Table 3). Costa, Felipe, Maia, Brasil, and Hernandez (2007) found 2.53% and 2.98% of citric acid in pineapple peel and pineapple pomace, respectively, values slightly higher than reported here. As most fruits mature, the acidity decreases, and the sugar content increases. Therefore, differences between acidity values may have been caused by variations in fruit ripeness and/or differences in pineapple varieties.Processed and dried pomace was light in colour, i.e., high L* value (75.63 ± 3.07) (Table 3), which is a desirable attribute because ingredients with dark colours could limit potential food applications. Regarding the a* and b* colour parameters, the sample presented values of −0.1 ± 1.79 and 26.91 ± 2.35, respectively.
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