I think they mentioned that cold brew has lower acidity than hot brew.
Yes it’s agitation with the mentioned frequency. Technically it should move the grounded coffee particles back and worth and so extracting the components.
Yes, they mentioned that cold brew has a reputation for being lower acidity than hot brew, but they didn’t measure the pH of the coffee they were testing using a hot brew process. They reported the pH of the normal cold brew and sonicated cold brew as both about 5.1.
For frequency, does it matter if it’s high or low frequency? I’m wondering if I can shake my cold brew for 3 minutes and get close to the same effect.
Yes hot brew coffee has more acidity tan cold brew. I like hand filter coffee and I use water around 90 degree Celsius. The higher I go with to boiling water the more it washes out bitter and acidic components.
Yes it’s agitation with the mentioned frequency. Technically it should move the grounded coffee particles back and worth and so extracting the components.