.4.1. Effect of pH on phytic acid precipitation
In S1, the best pH conditions for precipitating and reducing the losses of PA were found with a solution of 1.5 M Na2CO3 or 4 M NaOH and varying the pH value from 7.0 to 9.0 in increments of 0.5. After adjusting the pH of the respective supernatant S1, the solution was store for an additional 12 h. The formed pellets were recovered by centrifugation, as discussed above, and the supernatants were discarded. Ten pellets (P2) were obtained: 5 from the precipitation with 1.5 M Na2CO3 and 5 from the precipitation with 4 M NaOH. The P2 pellets containing PA were resuspended with 1 M HCl, 10 mL of formaldehyde and 0.5 g of diatomaceous earth to denature the proteins and remove other contaminants. The suspensions were shaken for 2 h at ambient temperature in a hood, kept at rest for an additional 12 h and filtered through qualitative filter paper Whatman # 3. In the filtered solution (S3) the best pH condition for PA precipitation was found with a 1.5 M Na2CO3 solution and varying the pH value from 7.0 to 9.0 in increments of 0.5. After adjusting the pH of S3, the pellet formed (P4) was recovered through qualitative filter paper Whatman # 3, and the filtered solution was discarded. All of the recovered PA precipitates were dried for 24 h in an oven at 60 °C and the content and yield of the purified PA were determined.
.4.1. Effect of pH on phytic acid precipitationIn S1, the best pH conditions for precipitating and reducing the losses of PA were found with a solution of 1.5 M Na2CO3 or 4 M NaOH and varying the pH value from 7.0 to 9.0 in increments of 0.5. After adjusting the pH of the respective supernatant S1, the solution was store for an additional 12 h. The formed pellets were recovered by centrifugation, as discussed above, and the supernatants were discarded. Ten pellets (P2) were obtained: 5 from the precipitation with 1.5 M Na2CO3 and 5 from the precipitation with 4 M NaOH. The P2 pellets containing PA were resuspended with 1 M HCl, 10 mL of formaldehyde and 0.5 g of diatomaceous earth to denature the proteins and remove other contaminants. The suspensions were shaken for 2 h at ambient temperature in a hood, kept at rest for an additional 12 h and filtered through qualitative filter paper Whatman # 3. In the filtered solution (S3) the best pH condition for PA precipitation was found with a 1.5 M Na2CO3 solution and varying the pH value from 7.0 to 9.0 in increments of 0.5. After adjusting the pH of S3, the pellet formed (P4) was recovered through qualitative filter paper Whatman # 3, and the filtered solution was discarded. All of the recovered PA precipitates were dried for 24 h in an oven at 60 °C and the content and yield of the purified PA were determined.
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