The phrase "a substantial number of samples" is correct and usable in written English.
You can use it when discussing a significant quantity of samples in research, analysis, or data collection contexts.
Example: "In our study, we analyzed a substantial number of samples to ensure the accuracy of our results."
Alternatives: "a considerable amount of samples" or "a significant quantity of samples."
Although the overlap between the two tests was large (11 samples tested positive or borderline positive in both), a substantial number of samples showed contradictory results (nine samples).
Active Erk5 was present in a substantial number of samples, as well as in tumours from an animal breast cancer model.
Still, a substantial number of samples could not be assigned to any of the categories.
Despite these stringent precautions moderate degradation was observed in a substantial number of samples.
There would still remain a substantial number of samples that do not appear to contain a demonstrable HPV genotype.
Therefore, the computational time required by the MC simulation might become infeasible for the cases, where a substantial number of samples are required by the analysis.
Already today, and even more tomorrow, a substantial number of these samples will also be transferred to and stored in large scale Biobanks [1].
In a substantial number of the samples analyzed a band with a retarded migration with respect to Erk5, that corresponded to pErk5, was observed (Figure 2C).
The clinical use of array-based diagnostics is relatively late in coming; this is partially due to the demand of a substantial number of patient samples to be used for training, since estimates of a predictor's error rate during model construction are more prone to be biased for small datasets[17].
JMD provided a substantial number of population samples to the study.
Furthermore, an overexpression of ALDH1, detected in a substantial number of our samples, indicates that CTCs might often display tumor stem cell characteristics, highlighting their role in metastasis formation.
