A buyer can describe a product as mango puree, apple puree or “fine puree” and still be describing a different material from the one a supplier is testing. The name is a commercial starting point, not a measurement. A useful sample conversation begins when the feed, the preparation boundary and the conditions behind the observation are written down. That is also the point at which an equipment discussion becomes comparable.
A product name is not a specification
Codex provides a product-identity framework for fruit juices, nectars and related materials, but commercial puree names are used more loosely in trade. One supplier may apply the word to a screened fruit flesh with visible fibre; another may use it for a finely milled preparation with a different solids and particle profile. FAO’s general manufacturing chapter makes the same practical point in a different way: the route depends on the fruit structure and on what is being separated, not on a single label. Before comparing two samples, record which fruit, which cultivar or variety where known, and which preparation steps have already happened.
- State whether the sample came from whole fruit, a prepared puree or a reworked stream.
- Name the preparation steps already completed, including washing, peeling, destoning and screening.
- Record the lot, the sampling point and the person who drew the sample.
Record the feed before you record the result
A measurement loses much of its meaning when the incoming material is unknown. Maturity, surface condition, damaged tissue, foreign matter and the interval since harvest can all change what reaches the screen. FAO’s quality-criteria discussion lists maturity, solids, acidity, colour, defects, size and contaminants as separate delivery considerations. These are not all measured in the same way, and not every one belongs in a puree purchase specification, but the list is a reminder that “fruit” is not a controlled input. Describe the feed in the same note as the sample result so a later trial does not compare two different starting materials.
- Use the actual delivery or lot description rather than a generic fruit name.
- Note visible damage, decay, unripe pieces and any foreign material.
- Keep the feed record with the sample label, even when the sample is later frozen or transported.
Describe particles, fibre and visible defects
A puree can look smooth on a spoon and still contain fibre bundles, seed fragments, peel particles or small stones. Those features matter differently in a beverage base, a bakery filling and an ingredient supplied to another plant. Describe what is visible first: colour, gloss, serum separation, floating fibre, sediment and any foreign particles. Then record the method used for any particle measurement. A screen aperture is a machine feature. A Dv percentile is a distribution result calculated under a stated method. Neither one is interchangeable with the other, and neither replaces a physical inspection of the sample.
- Photograph the sample in a consistent container and lighting condition.
- Record the measurement method, sample preparation and number of readings.
- Keep stones, hard seed fragments and other physical hazards out of any product sample used for sensory review.
Measure flow at a stated temperature
Puree is not a single-viscosity liquid. The observed flow depends on temperature, particle content, fibre, dissolved solids and the shear history before the measurement. A reading taken from a cold sample that has been sitting for an hour is not comparable with a reading taken at the process inlet. Record the temperature, the instrument or method, the reading time and the sample history. If the product is intended for a continuous thermal duty, also note whether it was pumped, recirculated or manually stirred before the reading. These details let a supplier or engineer ask whether the proposed equipment is being matched to the same material.
- State the sample temperature at the time of the flow observation.
- Record whether the sample was sheared, settled or reheated before measurement.
- Avoid quoting a viscosity value without its method and conditions.
Connect the sample to its intended use
The receiving application changes the relevant questions. A beverage formulator may care about dispersion and visible particles; a bakery filling may care about water release and behaviour in a deposit; a dairy or dessert application may care about acidity and separation at the addition point; an ingredient buyer may care about a specification that can be repeated in another plant. FAO’s chapter notes that extraction and downstream operations are a series of compromises between recovery and quality. The same compromise logic applies to the sample. State the intended use before deciding which observation is a defect and which is a desirable characteristic.
- Name the receiving process and the point at which the puree is added.
- Describe the finished-product test that will judge the sample, not only the tank appearance.
- Separate product-use requirements from food-safety and regulatory requirements.
Keep the evidence with the sample
A sample without its record becomes an anecdote. A record should identify the lot, the sampling point, the date and time, the product temperature, the container, the storage condition and the chain of custody. Retain a duplicate where the project justifies it. The record should also say what the sample cannot prove: a single container does not establish recovery, throughput, thermal-process adequacy, shelf life or compliance with a market standard. Those questions need a defined trial and the appropriate competent review. A sample is evidence about a material at a point in a process; it is not a substitute for the process record.
- Use a unique sample identifier that links to the trial and the equipment setting.
- Record storage and transport conditions, including any freezing or chilling.
- State the limits of the sample when it is sent to a customer or an equipment reviewer.
Sources and scope
- FAO — Principles and practices of small- and medium-scale fruit juice processing, Chapter 6
General unit operations, fruit preparation, extraction, deaeration and transfer. Historical principles, not a validation record for a new line.
- FAO/WHO Codex Alimentarius — official standards registry
Entry point for current product-identity standards. The named standard and its revision must be checked for the actual product and market.
Source links identify the general material used for this analysis. They do not certify this site, a machine or a project process. Exact product parameters, regulatory classification and acceptance criteria require the applicable standard, a representative trial and competent review.