Determination of four kinds of plant growth regulaters in apple by UPLC
Bibliographic record
Abstract
A solid phase extraction /ultra performance liquid chromatographic method was developed for the analysis of residues of 4- Chlorophenoxyacetic acid,5- Nitroguaiacolate,Thidiazuron and Forchlorfenuron in apple. Samples were extracted with 80% acetonitrile water solution,and then concentrated and cleaned up on a HLB solid phase column. The separation of target compounds was carried out on a BEH C18column( 2. 1mm ×50 mm,1. 7 μm) under gradient condition using methanol- 30 mmol /L NH4 Ac as the mobile phase. The recoveries ranged from 90. 1% to 95. 2% with the relative standard deviations of 1. 1%- 2. 4%. The detection limits of 4- chlorophenoxyacetic acid,5- nitroguaiacolate,thidiazuron and forchlorfenuron are 1mg /kg,1mg /kg,1mg /kg,and 0. 4 mg /kg,respectively. The developed method is simple and fast,and it can be used to detect four kinds of plant growth regulaters in apple.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".