Table II.
Recovery of Ascorbic Acid Added to Cream Formulations
| Cream formulationa | Added (mg%) | Found (mg%) | Recovery (%) | RSD (%) |
|---|---|---|---|---|
| 1a | 40.0 | 38.0 | 95.0 | 2.1 |
| 20.0 | 18.3 | 91.5 | 2.5 | |
| 2b | 40.0 | 37.1 | 92.8 | 1.5 |
| 20.0 | 18.5 | 92.5 | 2.5 | |
| 3c | 40.0 | 37.5 | 93.8 | 1.1 |
| 20.0 | 18.1 | 90.5 | 3.1 | |
| 4d | 40.0 | 38.4 | 96.0 | 1.3 |
| 20.0 | 18.9 | 94.5 | 2.1 | |
| 5b | 40.0 | 37.0 | 92.5 | 1.4 |
| 20.0 | 18.9 | 94.5 | 2.6 | |
| 6c | 40.0 | 36.9 | 92.3 | 1.0 |
| 20.0 | 19.0 | 95.0 | 2.2 | |
| 7d | 40.0 | 37.4 | 93.5 | 1.7 |
| 20.0 | 18.2 | 91.0 | 3.9 | |
| 8c | 40.0 | 38.0 | 95.0 | 1.5 |
| 20.0 | 18.8 | 94.0 | 3.3 | |
| 9d | 40.0 | 36.7 | 91.8 | 2.0 |
| 20.0 | 18.9 | 94.5 | 4.2 |
Values expressed as a mean of three to five determinations
aThe cream formulations represent combinations of each emulsifier (stearic acid, palmitic acid, myristic acid) with each humectant (glycerin, propylene glycol, ethylene glycol) to observe the efficiency of methanol to extract AH2 from different creams (Table I)