On IO9, Esther Inglis-Arkell does a great job of describing the molecular gastronomy practice of "spherification," whereby food is liquefied and then coaxed into forming gelatinous spheres. It has its origin in a 1950s drug-delivery project from Unilever, but was revived by chef Ferran Adrià around 2003.
What spherification does is put back in what the manufacturers of sodium alginate take out. First, the food, whatever it is, is pureed until it's liquid. Then the calcium content of the food is determined. If the calcium content is high, adding sodium alginate will solidify the whole thing immediately. To high-calcium foods extra calcium chloride is added. To all other foods, sodium alginate is added. Then, as with all delectable meals, it's off to the centrifuge. The mixture gets centrifuged to remove any bubbles or impurities there might be in it. Once that's done, drops of the stuff are tossed into a bowl of liquid. If the food contains calcium chloride, the liquid will contain sodium alginate. If the food contains alginate, it will be tossed into liquid containing calcium.
Immediately, the process begins. The outer edge of the spherical drops is the front line. When the sodium alginates hit calcium ions, the ions bind the long strings together, until they form a kind of haphazard net of polymers. The outer layer of the gel solidifies before any of the inner liquid can leak out. Depending on the concentration of both chemicals, and the time spent in the 'bath,' the gel will either be a tiny skin, or an extremely firm layer. Even if the mix of chemicals is weak, the reaction will keep moving inwards, so the balls have to be whisked carefully out of the bath, put on a plate, and rushed out to be set in front of the strained smiles of dinner guests. Then there's just enough time to say, "Oh. You served me vegetable soup in cold, quivering ball form. How original," and it's down the reluctant hatch.
Better living through chemistry.
The Horrific Practice of "Food Spherification"
(Image: Huevas de Té Verde, a Creative Commons Attribution (2.0) image from jlastras's photostream)
Olivia P. Judson’s paper in Nature, The energy expansions of evolution, presents a novel, beautifully written and presented frame for looking at the history of life on Earth: as a series of five epochs in which energy became more abundant and available to lifeforms, allowing them to scale up in complexity and fecundity: geochemical energy, […]
Beatboxer Tom Thum had ENT doctor and laryngeal surgeon Dr Matthew Broadhurst shine an endoscopic camera down his throat while beatboxing: “I wanted to find out how my larynx functioned when beatboxing compared to how it functions normally with speech, and whether or not there were any abnormalities in my laryngeal anatomy. I also had […]
Gastric bypass surgery is remarkably effective at promoting weight-loss (it cuts the long-term risk of early death from morbid obesity by 40%), and it’s long been presumed that the major action by which it worked was that, by bypassing the parts of the gut where most food absorbtion takes place, it limited the calories that […]
If you are camping during rainy season, or just want a TSA-approved lighter, these plasma torches make perfect travel companions. These gas-free lighters create a small plasma beam that’s safer than butane to use and more environmentally friendly. It creates a super-hot, splashproof flame so you can get a campfire going, or have a smoke […]
If you don’t want to get stuck footing the bill for a hit and run, this dashboard-mounted camera offers up to 2K resolution to make sure you always have a reliable witness, and it’s available in the Boing Boing Store for 30% off it’s usual price.The PapaGo mounts unobtrusively to your windshield to see everything […]
While some people still maintain that everything in Apple’s walled garden “just works” and is immune to the rampant malware of the Windows world, the reality is different. The Mac’s growing market share has made it a much more viable target for malicious actors, and its built-in tools aren’t always enough to fix things. Drive […]