| Samples (µg/mL) |
Dilution factor |
PAA (AU) |
Measured L-AA concentrations (µg/mL)1 |
Recovery (%) |
COV2 |
r2 |
|
Dragonfruit vitamin water |
1/50 |
684.25 ± 1.41 |
489.50 |
102.13 |
2.46 |
0.997 |
| (479.28) |
1/25 |
1290.47 ± 0.44 |
474.50 |
99.00 |
|
|
| |
1/9 |
3514.37 ± 3.27 |
461.34 |
96.26 |
|
|
| |
1/4 |
7932.46 ± 0.02 |
479.32 |
100 |
|
|
| |
|
|
|
|
|
|
| Camu powder extract |
1/45 |
285.54 ± 3.15 |
168.30 |
95.22 |
2.12 |
0.999 |
| (176.74) |
1/8 |
1381.97 ± 71.00 |
163.04 |
92.25 |
|
|
| |
1/4 |
2861.67 ± 9.69 |
171.40 |
96.97 |
|
|
| |
1/2 |
5620.27 ± 21.69 |
169.44 |
95.86 |
|
|
| |
|
|
|
|
|
|
| Orange vitamin water |
1/4 |
7996.65 ± 7.03 |
480.00 |
100 |
1.87 |
0.999 |
| (480.00) |
1/10 |
3294.70 ± 0.11 |
494.20 |
102.96 |
|
|
| |
1/25 |
1361.94 ± 0.13 |
502.00 |
104.58 |
|
|
| |
1/50 |
684.25 ± 1.41 |
489.50 |
101.98 |
|
|
| |
|
|
|
|
|
|
| Pressed berry juice |
1/2 |
3784.89 ± 55.15 |
113.74 |
103.23 |
6.28 |
0.995 |
| (110.14) |
1/5 |
1774.24 ± 12.42 |
131.70 |
119.58 |
|
|
| |
1/10 |
870.84 ± 3.67 |
126.30 |
114.67 |
|
|
| |
1/20 |
435.99 ± 2.98 |
120.40 |
109.31 |
|
|
| |
|
|
|
|
|
|
| Tropical juice |
1/5 |
7548.66 ± 5.79 |
570.03 |
100.00 |
3.81 |
0.999 |
| (570.03) |
1/12 |
3230.86 ± 3.54 |
581.46 |
102.00 |
|
|
| |
1/20 |
1993.46 ± 2.55 |
593.39 |
104.10 |
|
|
| |
1/100 |
396.43 ± 3.71 |
542.43 |
95.16 |
|
|
|
| PAA values are means ± SD of two determinations (n=2); 1L-AA concentrations calculated using y=mx+c; 2Precision between four concentration levels. Abbreviations:
AU: Absorbance Unit; COV: Coefficient of Variation; PAA: Peak Absorbance Area; r2, Correlation Coefficient |
| Table 1: Linearity of samples (Peak absorbance area vs. Dilution factor). |
