Table 2. Pearson’s correlation coefficients (r) between TAC, TFC, TPC and mineral content and antioxidant activity (1/EC50) of rice bran extracts (MS, SK, PY, PC and KK; for sample abbreviations see Materials and Methods).
| Extract | 1/EC50 | r (N=3) | ||||||
|---|---|---|---|---|---|---|---|---|
| TAC | TFC | TPC | Cu | Fe | Mn | Zn | ||
| MS | NO˙ | 0.994 | 0.842 | 0.129 | –0.532 | –0.932 | –1.000* | –0.127 |
| O2˙Ż | –0.380 | –0.874 | 0.811 | –0.493 | 0.762 | 0.475 | 0.926 | |
| LOO˙ | 0.777 | 1.000* | –0.432 | 0.016 | –0.979 | –0.839 | –0.632 | |
| SK | NO˙ | 0.631 | 0.160 | –0.330 | –0.998* | –0.998* | –0.014 | –0.237 |
| O2˙Ż | –0.970 | –0.721 | –0.302 | 0.839 | 0.764 | –0.589 | –0.393 | |
| LOO˙ | –0.949 | –0.666 | –0.230 | 0.877 | 0.811 | –0.527 | –0.323 | |
| PY | NO˙ | 0.153 | 0.724 | –0.981 | –0.176 | –0.933 | 0.024 | –0.688 |
| O2˙Ż | –0.944 | 0.268 | 0.292 | –0.786 | 0.756 | –0.893 | –0.317 | |
| LOO˙ | –0.736 | 0.976 | –0.705 | –0.916 | –0.220 | –0.818 | –0.986 | |
| PC | NO˙ | 0.846 | –0.679 | 0.307 | –0.865 | –0.998* | 0.907 | –0.720 |
| O2˙Ż | –0.227 | –0.916 | –0.799 | –0.757 | –0.392 | 0.694 | 0.420 | |
| LOO˙ | 0.955 | 0.116 | 0.922 | –0.182 | –0.597 | 0.271 | –0.996 | |
| KK | NO˙ | –0.701 | 0.422 | 0.984 | 0.732 | 0.468 | –0.181 | 0.765 |
| O2˙Ż | –0.888 | 0.121 | 0.881 | 0.492 | 0.719 | 0.170 | 0.927 | |
| LOO˙ | 0.913 | 0.702 | –0.177 | 0.376 | –0.992 | –0.878 | –0.870 | |
*correlation is significant at the 0.05 level (2-tailed). TAC=total anthocyanin content, TFC=total flavonoid content, TPC=total phenolic content