What does "cold pressed" mean?
Food waste is a pressing issue, so we’re doing our part by pressing cosmetically disadvantaged produce (think apples that are a little too small, carrots with curves, limes with yellow freckles and strawberries that are in surplus) into cold-pressed juice. We talk about cold-pressing a lot, but what exactly does “cold-pressed” mean? Have no fear, we’re here to explain it!
What does “cold-pressed” mean and how does it work?
By definition, cold-pressing is the process of separating fiber (pulp!) from the cells of fruits and vegetables without the aid of heat. After sorting, washing and chopping the produce, we put it into our juicer. The machine chews and crushes the fruits and veggies then uses a hydraulic press to put thousands of pounds of pressure on the produce. The result? Raw, nutrient-rich, fresh juice.
So when I juice at home, is that juice cold-pressed?
It depends on your juicer! Many at-home juicers are centrifugal juicers, which use rapidly spinning blades to pulverize produce. The rotation of the blades generate heat and expose the juice to air, which begins the process of oxidation. The heat and exposure to oxygen can destroy certain enzymes and nutrients.
Cold-pressed juicers (also called a masticating juicer), use hydraulic power to chew and crush the juice out of the fruits and veggies. No additional heat or oxygen is used to the process, meaning no lost nutrients
Why should I care if my juice is cold-pressed?
One word: nutrients! Because cold-pressed juice isn’t exposed to heat, it holds onto a ton of nutrients and vitamins. Removing the fiber allows your body to soak up those nutrients quickly. It is free from any added sugars and preservatives because it’s 100% fruits and veggies!
What’s the shelf life of cold-pressed juice?
Raw cold-pressed juice has a fridge life of 3-5 days.
When you see cold-pressed juices in the fridge at your local market, those juices have gone through some form of pasteurization or processing to kill the microorganisms that would otherwise make it go bad.
What is HPP (cold pressure/high-pressure processing)?
As if cold-pressing didn’t put enough pressure on our juice, it’s shelf life is extended through even more cold-pressure! We’re not talking peer pressure here, we’re talking about barometric pressure in a technique called High Pressure Processing (HPP for short, also referred to as “cold-processing” and “cold-pressured”). HPP allows us to distribute our delicious juice to retail stores around the Bay while not skimping out on taste, color, and nutrients. :)
How does HPP work?
HPP is a processing step that extends shelf life and kills at least 99.999% of the microorganisms in juice. Here’s how it works:
Raw juice is first made on a juice press, then bottled in plastic bottles.
Plastic bottles of juice are loaded into a giant chamber that fills with water and pressurizes the bottles up to 85,000 PSI. Pressure maintains between one minute and several minutes, then de-pressurizes. If you weighed down a bottle of juice and dropped it into the Mariana Trench, the deepest part of the ocean, you would only achieve 1/5th of the pressure created in an HPP machine
The result: almost no living microbial content in the juice and a shelf life of 30-45 days. This means a safer juice product and longer time on shelves in retail stores. It’s also FDA law for juice to undergo a process like HPP or heat pasteurization in order to be distributed wholesale. This process isn’t required if you’re selling directly to consumer, like our office juices.
So are all juices cold-processed?
While cold-processing has gotten more popular in the past few years, many traditional juice brands (anything kept at room temperature, many popular smoothie brands and OJ’s), use flash pasteurization. Flash pasteurization heats juices to a high-temperature for 3 to 5 seconds to destroy microorganisms. This gives juices a longer (and unrefrigerated) shelf life. The down side? Heat also kills some of the good nutrients, which means they need to be added back in.
We hope you enjoy your cold-pressed ugly juices!