--- title: "Fructose Syrup COA Explained: Fructose Content, Glucose and Solids — LiangduSyrup" url: "https://liangdusyrup.com/fructose-syrup-coa-explained-fructose-content-glucose-and-solids/" date: 2026-09-10 --- # Fructose Syrup COA Explained: Fructose Content, Glucose and Solids A certificate of analysis tells a buyer what a delivered batch of fructose syrup actually contains, as opposed to what the sales sheet promised. Read well, it prevents disputes; read carelessly, it becomes a rubber stamp. This guide explains each value commonly found on a fructose syrup COA, what range is reasonable, and how to use the document during receiving and release. What a COA Is and Is Not ------------------------ A COA reports measured results for a specific lot, produced under the supplier’s quality system. It is not a specification, a brochure or a guarantee that every future batch will match. The specification states the limits you agreed; the COA shows whether this particular lot met them. Both matter, and they should be compared line by line rather than treated as interchangeable. The Core Sugar Parameters ------------------------- ParameterTypical range or valueWhat it tells youFructose contentAbout 42% or 55% of solidsGrade and sweetness potentialGlucose contentThe balance of the sugar fractionBulking, browning, fermentabilityDry solids or BrixAround 71-77%Delivery cost and microbial stabilityDextrose equivalentVaries with gradeDegree of conversion and fermentablespHRoughly 3.5-5.5Acid balance and stability in drinks Fructose and glucose should be read together, because their ratio defines the grade far more precisely than either value alone. A lot labelled F55 whose measured fructose sits well below the agreed band is a mis-grade, even if the total sugar looks correct. The dextrose equivalent describes how far the starch conversion has proceeded and is a useful cross-check on consistency between lots. Appearance and Purity Measures ------------------------------ Colour, turbidity and ash, or conductivity ash, speak to how well the syrup was refined. Clear, low-colour syrup with low ash is what a pale beverage needs; elevated colour or haze can carry straight into a clear finished drink. Sulphur dioxide, where used, should sit within the legal limit for the destination market, and its declared level should be consistent with the process the supplier describes. Contaminants and Microbiology ----------------------------- Depending on the market and the supplier’s scope, a COA may report heavy metals such as lead and arsenic, and process markers such as hydroxymethylfurfural, which rises with excessive heat exposure. Microbiological results typically cover total plate count, yeasts and moulds. High solids suppress many organisms, so the usual concern is osmophilic yeasts rather than bacteria, and their presence points to a handling or hygiene failure rather than a raw-material problem. **Buyer tip:** check the lot number, production date and test date against your shipment. A COA that cannot be tied to the delivered container is paperwork, not evidence. How to Read It in Practice -------------------------- 1. Confirm the lot number matches the delivery documents. 2. Compare each result with the agreed specification limits, not with the previous supplier’s sheet. 3. Note the test method where given; results from different methods are not always directly comparable. 4. Keep a sealed counter-sample so any dispute can be tested independently. 5. Trend values over several shipments to spot drift before it becomes a rejection. Red Flags to Watch ------------------ Be cautious when a COA is generic rather than lot-specific, when key parameters are missing, when results are suspiciously identical from batch to batch, or when the document arrives without a traceable lot identifier. These are capability signals, not merely administrative gaps. A producer that tests routinely generates a clean, specific COA as a by-product of normal operations, so a weak document often reflects a weak process. Frequently Asked Questions -------------------------- What is the difference between a COA and a specification?The specification is the set of limits you and the supplier agree on. The COA is the measured result for one specific lot, showing whether it met those limits. You need both. Which value tells me the grade is correct?Fructose content on a dry basis is the key figure, read alongside glucose. An F55 lot should sit in the agreed band for fructose; a significant deviation indicates a different grade. Why is HMF reported on a fructose syrup COA?Hydroxymethylfurfural is a marker of heat exposure during processing and storage. Elevated levels can indicate excessive thermal treatment and may accompany colour development. Can I reject a batch based on the COA?If a result falls outside the agreed specification limits, that normally triggers the remedy clause in the contract. Confirm the test method and, where needed, retest a retained counter-sample before acting.