I recently started buying Alpina brand soy milk on Rappi for breakfast, but it goes sour really fast, even when I keep it in the fridge from day one. Does this happen to anyone else or could mine come defective? Should I try a different brand?
That's weird because ultrapasteurization is literally designed so it lasts longer. Two days is way too short even for regular unsterlized milk, so something's off. The first thing I'd check is the cold chain: if Rappi brings it without a thermal bag or takes forever with delivery, the drink can arrive already partially spoiled. Also check the expiration date when it arrives, because sometimes those things come expired or close to expiration and then they go bad in just a couple days anyway.
Another thing you should look at is how you're storing it at home. If your fridge isn't cold enough (it should be between 0°C and 4°C), the drink will spoil fast. Try putting a thermometer inside to be sure. Also, once you open the bottle, make sure you close it tight; if you leave the cap loose, air gets in and bacteria do too, and that ruins it by the next day.
If after checking all this it keeps happening, then yeah try switching brands or even stores. Maybe the Alpina distributor in your area is having logistics or storage problems. But before blaming the product, I'd first rule out that it's a storage issue at your place or during delivery.
You're not just looking at the brand, which is probably not the real problem. Most likely the cold chain is getting broken somewhere: between the Rappi warehouse, the delivery, and your fridge. If the delivery person leaves packages in the sun or takes too long, the drink starts to degrade even if you refrigerate it afterward, and those two days you mentioned might be all the time it has left before you notice the change. Try checking your fridge temperature with a thermometer (it should be between 2-4°C) and pay close attention to the expiration date when your order arrives, because sometimes Rappi brings products that have already been sitting in stock for days.
I suspect the problem is the cold chain during transport, because something similar happened at my place when I started ordering dairy products through an app - the drink would arrive lukewarm or barely cold, and it would spoil in less than a week even though the fridge was fine. Did you check how the order arrives? If it comes in a bag without enough ice or takes too long to get there, that kills the ultra-pasteurization. I switched strategies and started buying at the physical store, and it lasted normally there. If you want to keep ordering through the app, try asking them to include more ice or use a convenience store that's closer so delivery is faster - changing brands probably won't fix anything if transport is the culprit.
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