What Is Brix? A Practical Guide for Food Purchasers

Brix (°Bx) measures the sugar content of a liquid solution as a percentage of weight. One degree Brix equals one gram of sucrose per 100 grams of solution. In food manufacturing, Brix is the primary specification for purchasing fruit juice, concentrates, purees, and syrups: it determines pricing, flavour intensity, and regulatory compliance. A refractometer reading of 65°Bx on orange juice concentrate means 65% of the solution’s weight is dissolved solids (predominantly sugars).

In short:

• Brix is measured using a refractometer (optical, handheld or inline) or a hydrometer (density-based). Refractometers are standard in commercial trading because they require only a few drops of sample and give instant readings.
• Codex Alimentarius sets minimum Brix values for commercial fruit juices: orange 11.2°Bx, apple 11.5°Bx, grape 16.0°Bx, pineapple 12.8°Bx. Concentrate Brix values are multiples of these. For example, orange concentrate at 65°Bx is nearly 6x the original strength.
• Brix directly affects pricing: juice and concentrate are traded on a cost-per-Brix-tonne basis. A 1°Bx deviation from spec can represent a 1–2% cost difference per shipment.

How Is Brix Measured?

Refractometry is the standard commercial method. A refractometer measures how light bends (refracts) when passing through a liquid. Higher dissolved solids concentration = greater refraction = higher Brix reading. Digital refractometers provide readings accurate to ±0.1°Bx and automatically correct for temperature.

Handheld refractometers are used for quick field and warehouse checks. Place a few drops of juice on the prism, close the cover, and read the scale. Cost: €50–300 for analog, €200–1,000 for digital.

Inline process refractometers are installed in production lines for continuous Brix monitoring during concentration, blending, or reconstitution. They enable real-time quality control and automated process adjustments.

Hydrometers measure liquid density and convert to Brix via density tables. Less common in modern practice but still used in some sugar refining and brewing applications. Hydrometers require larger sample volumes and manual temperature correction.

Temperature affects Brix readings because sugar solution density changes with temperature. The international reference temperature is 20°C. Digital refractometers correct automatically; analog instruments require a correction table. A 10°C temperature error can shift a Brix reading by 0.4–0.5°Bx.

Codex Standard Brix Values by Fruit

The Codex Alimentarius sets minimum Brix levels for reconstituted fruit juice. Juice below these values cannot legally be labelled as 'fruit juice' in the EU.

Concentrate that arrives below the contracted Brix means you are paying for water instead of dissolved solids. Always verify Brix at receipt against your purchase specification.

Brix as a Pricing Tool: Cost-per-Brix-Tonne

In the juice and concentrate trade, pricing is often expressed as cost per Brix-metric-tonne (BMT). This normalises prices across different concentration levels. The formula: Price per BMT = Price per MT ÷ (°Bx ÷ 100).

For example, orange juice concentrate at €2,500/MT at 65°Bx = €2,500 ÷ 0.65 = €3,846 per BMT. Comparing this to NFC at €800/MT at 11.2°Bx = €800 ÷ 0.112 = €7,143 per BMT. This calculation demonstrates why concentrate is more cost-effective for most manufacturing applications despite the higher per-MT price.

Always include a Brix tolerance in your purchase contract (e.g., 65°Bx ±1°Bx). Specify the measurement method, temperature reference, and whether the seller’s or buyer’s analysis prevails in disputes. A 1°Bx deviation on a 20 MT shipment of orange concentrate can represent €750–1,000 in product value.

Beyond Sugar: What Else Does Brix Tell You?

Brix measures total dissolved solids, not just sugar. In fruit juice, dissolved solids are approximately 85–90% sugars, with the remainder being organic acids, minerals, and other compounds. In most fruit applications, Brix is a good indicator of sugar content, but not an exact measurement.

For products with significant non-sugar dissolved solids (tomato paste, vegetable juices, dairy), Brix readings will overestimate sugar content. In these cases, HPLC sugar profiling provides the precise sugar composition (glucose, fructose, sucrose individually).

Brix is also used as a harvest maturity indicator for fresh fruit. Higher Brix generally means riper, sweeter fruit. For frozen fruit procurement (IQF strawberries, for example), specifying a minimum Brix ensures consistent sweetness across batches from different harvest windows.

For a deeper comparison of how Brix values affect buying decisions, see our articles on juice concentrate vs NFC and juice processing methods. If you’re looking to buy fruit juice, concentrate, and puree from certified suppliers then you can use the search engine on Nutrada. Filter by fruit type, Brix level, and processing method.

Frequently Asked Questions

What instrument do I need to measure Brix?

For incoming quality control, a digital handheld refractometer (€200–1,000) is sufficient. For production line monitoring, install an inline process refractometer. Both should be calibrated regularly with distilled water (0°Bx) and certified sucrose solutions.

Is Brix the same as sugar percentage?

Not exactly. Brix measures total dissolved solids, which in fruit juice is approximately 85–90% sugars. For pure sugar solutions, Brix equals sugar percentage. For fruit products, Brix is a good indicator, but it includes organic acids and minerals in the reading.

What is the Brix/acid ratio?

The ratio of Brix to titratable acidity (expressed as % citric acid). It indicates flavour balance: a higher ratio = sweeter perception. Codex specifies a minimum Brix/acid ratio of 7:1 for orange juice. Premium NFC orange juice typically ranges from 12:1 to 16:1.

How does temperature affect Brix measurement?

Sugar solution density changes with temperature. The reference standard is 20°C. A sample at 30°C will read approximately 0.4–0.5°Bx lower than the true value. Digital refractometers compensate automatically; analog instruments require manual correction from published tables.