Sample collection is one of the most important steps in cannabis analysis. Many clients underestimate the importance of proper sample selection and handling, which can negatively impact the results.
Why is good sample collection important in cannabis analysis?
In cannabis analysis, the accuracy of the results directly depends on the quality of the sample provided. Despite having the best analytical techniques and advanced equipment, if the sample is inadequate or poorly handled, the results will be far from accurate. This can lead to problems such as:
- Incorrect or inaccurate results: Poorly collected or contaminated samples can yield results that do not reflect the reality of the entire batch.
- Delays in analysis: The laboratory may need to repeat tests if the sample is insufficient or poorly preserved.
- Additional costs: Poor sample collection can extend analysis time and increase unnecessary costs.
What does a representative sample mean?
To obtain accurate results, the sample must be representative of the entire batch. That is, it must faithfully reflect the variability within a crop or product.
In the case of hemp and other cannabis-derived products, this is especially important since the concentration of cannabinoids, terpenes, and other compounds can vary significantly within a single plant or batch.
Factors such as light exposure, water and nutrient availability, soil composition, and storage and transportation conditions can affect the concentration of cannabinoids and other compounds. Even within the same plant, flowers located in different positions can show variations in composition.
How to obtain a representative sample?
To ensure the sample reflects the composition of the batch, a systematic sampling procedure is necessary. Here are some key tips:
- Harvest sampling: Once the hemp is harvested, spread the material on a flat surface and draw a grid. Take samples from at least three randomly selected portions and mix them to obtain a homogeneous sample. From this mixed material, take the necessary amount for analysis.
- Sampling from growing crops: If the hemp has not yet been harvested, randomly select plants from different areas of the crop. For each plant, take samples from different parts, such as buds from the top, middle, and bottom. Then, mix the collected samples before sending them to the laboratory.
- Sampling of derived products: More homogeneous products such as extracts, concentrates, and distillates are easier to sample. However, it is important to ensure the material is clean and homogeneous before collecting the sample. If the material is liquid, it is advisable to stir it before sampling.
What sample quantity is necessary for cannabis analysis?
The necessary sample amount depends on the type of analysis and the product in question. Sending too much sample may overwhelm the laboratory, while too little may prevent precise analysis.
A general rule is that the sample amount should be sufficient for the analysis and for keeping a portion in case it’s necessary to repeat tests or perform additional analyses. For example, if you are sending cannabis flowers for cannabinoid analysis, 1 gram is typically sufficient. For hash and other extracts, 0.5 grams is recommended. If you are sending oils or tinctures, 1 gram is needed, and for vape cartridges, you should send the entire cartridge.
The importance of correct sample identification
One of the most common errors in cannabis analysis is poorly labeled or unidentified samples, which can lead to serious issues in the results.
Always make sure to label the samples clearly and provide all relevant information. This includes:
- Client or company name
- Sample type (flower, extract, oil, etc.)
- Batch from which the sample is taken
- Sample collection date
- Any other relevant information for the analysis
How to prepare and send the sample?
The packaging and shipping process is critical to maintaining the integrity of the samples. Here are some key tips:
- Proper packaging: Use containers that protect the sample from moisture, contamination, and degradation. Glass, metal, or silicone containers are excellent options since they are inert materials that do not interact with the sample's components. Avoid using paper, non-specific plastics, or adhesive tapes, as they can contaminate the sample or absorb some of the cannabinoids.
- Preservation: Keep the sample dry and avoid exposure to extreme temperatures. Vegetative samples, such as cannabis flowers, should have a moisture content below 15% to prevent degradation. If the sample cannot be dried before shipment (such as with food products), consider using refrigerated shipping.
- Fast shipping: The faster the sample reaches the laboratory, the better the analysis quality. Don’t worry, our collection service will ensure that the sample arrives in the best conditions.