Collecting a juice sample:
Most harvest samples received at ETS come to the laboratory as juice. Berries should be selected from at least 20-40 different clusters, and can easily be pressed by hand in their collection bag – pour the juice into a standard ETS 60mL sample tube and label with your ETS client labels.
Samples should be kept cool to prevent fermentation.
We are unable to run Harvest Juice Panels on fermenting samples, because even small percentages of alcohol can cause inaccurate or misleading results. Fermenting juice or must samples should instead be submitted for individual component tests.
Contact us for help choosing the appropriate analyses.
Preparing a berry sample:
A representative sample is critical to obtain accurate results.
- Grape samples should include berries from at least 20-40 different clusters. Clusters can be collected either from harvest containers or directly from the vineyard.
- All the berries should be stripped from the clusters and mixed.
- Collect 300-400 of the mixed berries in a sealed plastic bag. (about 500g or 16 oz)
- Label each bag with the client name, sample ID, and requested analyses. ETS provides free sample labels that are pre-printed and barcoded with your client ID – visit our website or give us a call.
Cluster Sample Fee
We encourage clients to submit berry samples rather than whole clusters. If samples are submitted as clusters, ETS will prepare a berry sample for an additional fee.
* Grape samples submitted for the Rapid Phenolic Panel should contain ONLY intact and undamaged fruit to ensure accurate results.