Extraction, Purification and Characterization of Antioxidant Fractions from Zizyphus spina-christi Fruits
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Bibliographic record
Abstract
In this study, in vitro antioxidant activity, total phenolic content and concentration of flavonoids of five different extracts from the Zizyphus spina- christi fruits were determined using spectrophotometric methods. Antioxidant activity of extracts were expressed as percentage of DPPH radical inhibition and values were ranged from 31.76% - 90.23% which indicated that zizyphus manifested the strongest capacity for neutralization of DPPH radicals. The total phenolic content ranged from 11.04 - 56.44 mg/g expressed as quercitin equivalent. The concentration of flavonoids in the zizyphus extracts varied from 16.66 - 58.32 mg/g expressed in terms of rutin equivalent (mg of RU/g extract). Methanolic extract of zizyphus showed the highest phenolic and flavonoid concentration and strong antioxidant activity. The significant linear correlation was confirmed between the values for the total phenolic content and antioxidant activity of plant extracts. The high contents of phenolic compounds indicated that these compounds contribute to the antioxidant activity. The zizyphus fruit can be regarded as a promising candidates for natural plant sources of antioxidant with high value.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it