The phrase "a small sample of each" is correct and usable in written English.
It can be used when referring to a limited quantity taken from multiple items or categories for analysis or representation.
Example: "In our study, we collected a small sample of each species to assess their health and population dynamics."
Alternatives: "a brief selection from each" or "a limited portion of each".
Fritz's person, Evan Ball, assures in the description: "For those concerned about Fritz's diet, he was only rewarded with a small sample of each sausage for his efforts.
A small sample of each plasmid was used to re-transform FM628 to confirm ARS function.
A small sample of each ceramide synthase assay was resolved by SDS-PAGE and immunoblotted.
As in the SVC test, a small sample of each expired breath was analyzed and sent to the chart recorder to monitor end-tidal CO2.
A small sample of each primary PCR product was verified to consist of the expected 660-bp band fragment on an E-Gel (2% agarose) containing SYBR Safe (G7208 02; Invitrogen).
A small sample of each eluent was evaluated using thin layer chromatography and those eluents which showed similar chemical composition were combined and concentrated under vacuum to yield a total of 15 DCM sub-fractions designated as SC/D-F1, SC/D-F2, SC/D-F3, SC/D-F4,..., SC/D-F15.
Here, the characteristics of each are outlined in relation to its purpose, and it reviews a small sample of the models of each type that have been developed in forest ecophysiology in recent years, focusing on those of their properties that are of particular interest in relation to their purpose.
The general practice is to collect a small sample of blood from each newborn, generally by pricking the infant's heel and collecting drops of blood on special filter paper, which is then analyzed.
We ran five cycles of competition and preserved a small sample of spores at each cycle to estimate the relative frequencies of the competing isolates.
A simple and quick assay to assess for cell viability in the RNAi experiment is to stain a small sample of cells at each time point with trypan-blue (Sigma).
The first step in engineering the replacement urethras was taking a small sample of cells from the bladder of each of the boys.
