Inter-Laboratory Reproducibility and Interchangeability of 3R4F and 1R6F Reference Cigarettes in Mainstream Smoke Chemical Analysis and <i>In Vitro</i> Toxicity Assays
Bibliographic record
Abstract
Summary A new reference cigarette, 1R6F, produced by the Kentucky Tobacco Research and Development Center, has been manufactured as a substitute for the 3R4F reference cigarette because of a depletion of 3R4F stock. The purpose of the current study was to investigate the interchangeability of 1R6F and 3R4F by comparing the chemical and biological characteristics of the mainstream smoke and to assess the inter-laboratory reproducibility by comparing the results obtained in the current study with a previous report. We analyzed 45 priority chemicals required by Health Canada for regulatory reporting and assessed the toxicological effects of cigarette smoke using in vitro standard toxicological assays recommended by the Cooperation Centre for Scientific Research Relative to Tobacco (CORESTA) under the International Organization for Standardization (ISO) standard and intense smoking regimens. The results of the chemical analysis and standard toxicological assays showed a good inter-laboratory reproducibility for 1R6F as a reference cigarette, while there were some slight reproducible differences between 1R6F and 3R4F. In addition, we investigated the interchangeability of 1R6F with 3R4F in some additional toxicological assays that detect oxidative stress because oxidative stress is a principle endpoint used in tobacco research with next generation tobacco and nicotine delivery products (NGPs). Both 1R6F and 3R4F elicited comparable responses in the oxidative stress assays. Overall, our results showed inter-laboratory reproducibility in chemical and standard toxicological assessments of 1R6F; thus, suggesting the suitability of 1R6F as a reference cigarette. In addition, the results obtained in the oxidative stress assays provide insight into the interchangeability of 1R6F with 3R4F when used as a comparator for NGPs.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
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 | 0.003 | 0.004 |
| 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".