Selenium and Trace Element Distribution in Astragalus Plants: Developing a Differential Pulse Polarographic Method for Their Determination
Notice bibliographique
Résumé
Astragalus plants have a wide range of applications in pharmaceuticals (gum tragacanth), as thickening agents in foods, and may have applications in controlling cancer cells. They are used as feed for animals and they are indicator plants for selenium. Because of their use in health-related areas it is very important to determine their selenium and trace element content with high accuracy. A new differential pulse polarographic method was established for trace element determination (10 elements) and their distribution in these plants. The Astragalus plants investigated in this work are Astragalus microcephalus and Astragalus lusitanicus, which grow almost everywhere. Their roots, stems, and leaves were analyzed separately. Since some Astragalus plants are known to accumulate selenium, the most emphasis was given to its determination. The Astragalus plants were wet digested and their DPP polarograms were taken in various media. In pH 2 acetate buffer, Se, Mo, Cd, Pb, Cr, Zn, and As peaks, and in pH 4 acetate buffer, Cu, Se, Mo, As, and Zn peaks could be separated and determined. In the presence of EDTA at pH 4, Cu, Ti, Se, and As peaks, and at pH 6, Fe, Cu, Ti, and As peaks could be separated and determined. Thus, by adjusting the pH and medium, it was possible to determine 10 trace elements in the same solution. While in Astragalus microcephalus plants the Se content was 183 \\pm 15 m g/g, another plant, Elymus (Gramineae), which was taken from the same soil had no selenium, which indicates that selenium is accumulated in this kind of astragalus plant. On the other hand, no selenium was found in Astragalus lusitanicus plants. The types of Astragalus plants that accumulate selenium to the greatest degree are known to grow in Canada, USA, Russia, Afghanistan, Spain, and Turkey. According to the results, most of the elements are accumulated in the roots, but selenium was also distributed in the stems and leaves. Although large quantities of Cr were present in the roots, it was under the detection level in the stems and leaves. On the other hand, there was a level of iron present in both the roots and leaves. The proposed method is simple, fast, and cheap, does not require any preconcentration or separation procedure, and can be safely used with many biological materials.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».