Nata de coco is made by fermenting coconut water with a specific species of bacteria that converts sugar into sheets of pure cellulose. The process takes roughly 11 days from start to finish, producing a translucent, chewy gel that’s then cut into cubes and soaked in sugar syrup. What makes it unusual is that the final product isn’t really coconut at all. It’s a mat of microscopic cellulose fibers, built one glucose molecule at a time by living bacteria floating on the surface of coconut water.
The Bacteria Behind the Gel
The entire process depends on a bacterium called Acetobacter xylinum (now often classified under the genus Komagataeibacter). This microbe does something remarkable: it eats sugar and excretes cellulose, the same structural fiber found in plant cell walls. Each bacterial cell contains an enzyme called cellulose synthase, anchored in its membrane, that links individual glucose units into long chains. These chains bundle together into ultra-fine fibers that interweave into a dense, three-dimensional mesh.
Because the bacteria need oxygen to thrive, they naturally float to the surface of whatever liquid they’re growing in. As millions of cells produce fibers simultaneously, a solid mat, called a pellicle, forms at the air-liquid interface. This pellicle is nata de coco in its raw form. It’s about 99% water trapped within a tight network of cellulose, which is what gives it that distinctive firm-yet-bouncy texture that no plant-based gel can quite replicate.
Preparing the Culture Medium
Coconut water is the traditional base, and it remains the standard in commercial production. Producers typically use coconut water from mature fruits, sometimes stored for a few days before processing. On its own, coconut water provides some sugar and minerals, but it needs a few additions to create the ideal growing environment for the bacteria.
White sugar (sucrose) is added as an extra carbon source, typically at concentrations above 1%. A nitrogen source, most commonly ammonium sulfate, is dissolved into the liquid at concentrations above 0.1% to support bacterial growth. The acidity is then adjusted to a pH of around 4.0 to 4.5 using acetic acid (essentially vinegar). This mildly acidic environment favors the cellulose-producing bacteria while discouraging many common contaminants. The medium is sterilized before inoculation, usually by heating in an autoclave, to kill off any unwanted microbes that would compete with or spoil the culture.
Fermentation in Shallow Trays
The prepared coconut water is poured into shallow rectangular trays, typically about 45 cm by 30 cm by 12 cm in factory settings, filled with 1.5 to 1.7 liters of liquid each. The trays are then inoculated with a starter culture containing the bacteria. Each tray is covered with kraft paper (or sometimes newspaper in smaller operations) and left undisturbed.
This is the critical part: the fermentation must be completely static. Any shaking or tilting disrupts the pellicle forming at the surface, producing uneven or fragmented sheets. The trays are stacked one on top of another in large fermentation rooms kept at around 30°C. This shallow-tray stacking method is the dominant production approach across major producing countries including the Philippines, Indonesia, Vietnam, Thailand, and China, because it maximizes the surface area where bacteria can access both the liquid nutrients below and the air above.
Over the next 10 to 12 days, the pellicle steadily thickens. Research on the fermentation process found that the average production cycle runs about 11 days, yielding a slab roughly 0.8 cm thick. Interestingly, once the sugar and nitrogen levels are above their minimum thresholds, the main factor limiting growth isn’t nutrient supply. It’s oxygen. As the pellicle thickens, it becomes harder for oxygen to reach bacteria deeper in the mat, which is why the gel eventually stops growing on its own.
Harvesting and Washing
Once the pellicle reaches the desired thickness, it’s peeled out of the tray as a single rubbery sheet. At this stage, it has a sour smell from the acidic fermentation liquid and contains trapped bacteria, residual sugars, and metabolic byproducts. The raw sheets go through repeated cycles of boiling and soaking in clean water, sometimes over several days, to neutralize the acidity and wash out impurities. This is what transforms the tangy, off-white raw slab into the odorless, nearly transparent gel you see in finished products.
After washing, the sheets are cut into the familiar small cubes, roughly 1 to 2 cm on each side.
Sweetening and Packaging
Plain nata de coco is almost flavorless on its own. It’s essentially water held in a cellulose scaffold. The taste comes entirely from the syrup it’s packed in. Commercial nata de coco drinks and dessert toppings typically use a sugar syrup at around 11 to 13 °Brix, which is a moderate sweetness similar to most fruit juices. Flavoring varies widely: lychee, strawberry, pandan, and plain sugar syrup are all common. The cubes absorb some of the surrounding syrup over time, so they carry flavor into whatever they’re added to.
The finished cubes in syrup are heat-sealed in jars or pouches, often pasteurized for shelf stability. A typical serving of commercial nata de coco in syrup contains about 72 calories and 17 grams of carbohydrates per 100 grams, with a small amount of dietary fiber.
Why It’s Almost Pure Cellulose
What sets nata de coco apart from other gel-like foods (like agar or gelatin) is that it’s a product of bacterial biosynthesis rather than extraction from a plant or animal. The cellulose fibers the bacteria produce are chemically identical to the cellulose in cotton or wood, but they’re far finer and more uniformly structured. This microstructure is what creates that unique chewiness: firm enough to resist your teeth, but with a satisfying snap rather than the brittleness of agar or the melt of gelatin.
Because the cellulose network holds so much water, nata de coco is extremely low in calories before any syrup is added. The gel itself contributes almost no digestible nutrients. It passes through the digestive system much like other insoluble fiber, which is part of why it’s sometimes marketed as a diet-friendly food, though the sugar syrup it’s sold in adds most of the calories in a typical serving.
A Filipino Invention
Nata de coco was invented in 1949 by Teódula Kalaw África, a Filipino chemist working for the National Coconut Corporation (now the Philippine Coconut Authority). It was developed as an alternative to nata de piña, a similar fermented gel traditionally made from pineapple juice that was already popular in Filipino cuisine. Commercial production began in 1954, when the Philippine Coconut Administration opened a facility in Alaminos, Laguna and taught local farmers the technique. From there, production spread across Southeast Asia, and nata de coco became a staple ingredient in desserts, drinks, and fruit cocktails throughout the region and eventually worldwide.