Development of Monoclonal Antibodies Against Cry1Ab Protein from<i>Bacillus thuringiensis</i>and Their Application in an ELISA for Detection of Transgenic Bt-Maize
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Bibliographic record
Abstract
Several transgenic insect resistant maize varieties, commonly referred to as Bt-maize, express the gene for the Bacillus thuringiensis toxin Cry1Ab. As a method for the determination of Bt-maize, a sandwich-type ELISA for Cry1Ab was established. Monoclonal antibodies were developed by immunization of mice with trypsin-activated Cry1Ab. The secondary antibody was labeled with horseradish peroxidase, and 3,3',5,5'-tetramethylbenzidine (TMB) was used as chromogene. The detection limit was 0.4 ng ml m 1 of Cry1Ab. No (Cry1Ac, Cry1C, Cry2A, Cry3A) or only little (Cry9C) cross-reactivity with other Cry proteins was observed. Furthermore, the assay was applied to protein extracts from maize powder containing different amounts of Bt-maize from three different lines (Bt-176, Bt-11 and MON810). Using 100 mg maize per sample and Tris-borate buffer for rapid protein extraction, the minimum detectable mass fraction was 0.10% for Bt-11 and 0.23% for MON810. In contrast, Bt-176 maize could not be detected due to the fact that the Cry1Ab gene is not expressed in seed tissue of Bt-176 maize.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| 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