Brix is the first number a pineapple buyer looks at, and also one of the most misunderstood. Many believe MD2 pineapple tastes sweeter because its Brix is higher, that EU law requires 12 °Brix, or that a yellow-skinned fruit is a sweet fruit. According to authoritative sources, none of these three claims is accurate. This article explains what Brix is, how to measure it correctly, which threshold applies to whom, and where MD2 really differs from Cayenne.
Key points
- Brix measures soluble solids (mainly sugars) with a refractometer, under ISO 2173:2003; the sample must be juice representative of the whole fruit.
- Codex requires fresh pineapple to reach at least 12 °Brix. EU law sets no Brix threshold for pineapple; EU buyers typically target 13–17 °Brix.
- MD2 does not necessarily have a higher Brix than Cayenne; the measurable difference is lower acidity, which makes the sweetness more pronounced, and higher vitamin C.
- Pineapple does not ripen further or become sweeter after harvest; ethylene only turns the skin yellow.
How to measure Brix correctly
The standard method is ISO 2173:2003 (determination of soluble solids in fruit and vegetable products by refractometry), confirmed by ISO in 2022. Codex CXS 182-1993 requires a juice sample representative of the whole fruit, not a single-point reading, because sugar is not evenly distributed within a pineapple.
In the packhouse, Brix can be measured non-destructively by near-infrared (NIR) spectroscopy. Trials on Smooth Cayenne pineapple in Australia gave an error of about 1 °Brix, sufficient for grading fruit (Guthrie and Walsh, 1997). In the literature, “°Brix” and “% soluble solids” (TSS, SSC) are used interchangeably.
Brix thresholds: who requires what
| Applies to | Requirement | Source |
|---|---|---|
| Fresh pineapple (international standard) | Minimum 12 °Brix; does not apply to pineapple intended for processing | Codex CXS 182-1993 |
| Fresh pineapple into the EU (law) | No Brix threshold; only requires “satisfactory ripeness, not overripe” | Delegated Regulation (EU) 2023/2429 |
| EU buyers (in practice) | Minimum 12, typically targeting 13–17 °Brix; air-freighted fruit from 15 | CBI, 2022 |
| Consumers (recommendation) | Minimum 12% soluble solids and maximum 1% acidity for most consumers to accept the flavour | Kader, UC Davis |
| Reconstituted pineapple juice, EU / US | Minimum 12.8 °Brix | Directive 2012/12/EU; 21 CFR 146.185 |
| Pineapple juice, Japan (JAS) | Reconstituted from 11 °Brix; concentrate from 27 °Brix | JAS 1075 |
Two common misunderstandings: the 12 °Brix figure for fresh pineapple comes from Codex and from buyers, not from EU law; and Codex does not apply to pineapple supplied as raw material for processing, so it is wrong to say “the plant must buy pineapple from 12 °Brix under Codex”. For pineapple juice, the Brix threshold refers to the reconstituted product. See the pillar article on pineapple juice exports.
Is MD2 sweeter than Cayenne?
Measurements of 26 cultivars grown under the same conditions in Guangdong (Lu et al., Molecules, 2014):
- MD2: 16.12 °Brix; acidity 0.53%; Brix-to-acid ratio about 30; vitamin C 33.57 mg/100 g.
- Smooth Cayenne: 16.55 and 14.45 °Brix in two lines; acidity 0.73% and 1.23%; Brix-to-acid ratio about 23 and 12; vitamin C 5–8 mg/100 g.
MD2’s Brix is therefore not necessarily higher than Cayenne’s. The consistent difference is lower acidity, which makes the sweetness more pronounced. Trials by the Fruit and Vegetable Research Institute (2006–2008, reported by the Agriculture and Environment newspaper in 2009) recorded MD2 Brix 0.35–3.40 points higher than Chinese Cayenne, with lower acidity. Results vary by area and season, so each growing area needs to run its own measurements. An experiment on acid sulphate soil in Tan Phuoc recorded the highest MD2 Brix, 16.2%, with 10 g K₂O/plant plus a calcium nitrate spray (Nguyen Trinh Nhat Hang, Nguyen Khanh Duy, 2022). See the article comparing MD2 and Cayenne.
Brix, ripeness and skin colour
Pineapple is a non-climacteric fruit: it does not ripen further after harvest; exposing the fruit to ethylene only speeds up the loss of green colour slightly and does not change internal quality (Kader, UC Davis). A yellow skin therefore does not mean a sweet fruit, and fruit picked immature will not become sweeter in storage.
Brix rises while the fruit ripens on the plant: in MD2 in Malaysia, soluble solids increased from about 15.4% to 18.0% as the fruit progressed from maturity stage 1 to stage 4 (Ding and Syazwani, 2016). EU buyers grade skin colour from C0 (fully green) to C4 (yellow-orange over the whole fruit) according to their own specifications. Skin-colour thresholds corresponding to a specific Brix for MD2 grown in Vietnam: not yet published. See the article on flower induction and harvesting.
What companies should do
AgrifoodV recommendations:
- Equip teams with refractometers and measure Brix and acidity by plot in the field before harvest, using a juice sample representative of the whole fruit.
- Build a correlation table of skin colour, Brix and acidity for your own growing area over 1–2 seasons to guide harvesting.
- State clearly in contracts the Brix and acidity thresholds, the sampling method and the measurement method, to avoid disputes.
AgrifoodV supports companies in building raw-material quality control procedures in the growing area.
References
- ISO 2173:2003 Fruit and vegetable products – Determination of soluble solids – Refractometric method. iso.org.
- Codex Alimentarius. Standard for Pineapples, CXS 182-1993 (revised 1999, amended 2005, 2011). fao.org.
- European Commission. Delegated Regulation (EU) 2023/2429 on marketing standards for fruit and vegetables, consolidated version of 4 October 2025. eur-lex.europa.eu.
- CBI (Netherlands Ministry of Foreign Affairs). Entering the European market for fresh pineapples, 10 October 2022. cbi.eu.
- Kader, A. A. Pineapple – Produce Fact Sheet. UC Davis Postharvest Research and Extension Center. ucdavis.edu.
- Guthrie, J.; Walsh, K. B. Study on non-destructive measurement of pineapple sweetness by NIR. Australian Journal of Experimental Agriculture, 1997. DOI: 10.1071/EA96026.
- Lu, X.-H. et al. Molecules 19(6): 8518–8532, 2014. DOI: 10.3390/molecules19068518.
- Ding, P.; Syazwani, S. Study on MD2 pineapple quality by maturity stage. International Food Research Journal 23(2): 549–555, 2016. agris.fao.org.
- Agriculture and Environment newspaper (Nong nghiep va Moi truong). Article on the Fruit and Vegetable Research Institute’s MD2 pineapple variety trials, 1 July 2009. nongnghiepmoitruong.vn.
- Nguyen Trinh Nhat Hang, Nguyen Khanh Duy. Tạp chí Khoa học Công nghệ Nông nghiệp Việt Nam [Vietnam Journal of Agricultural Science and Technology], No. 07(140)/2022. tapchi.vaas.vn.
Article by AgrifoodV, compiled from the sources above (accessed 17 October 2026). This content is for reference only and is not a substitute for technical advice for a specific growing area. Cover image: Anna Klymenko / Pexels.
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