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Zeitpunkt              Nutzer    Delta   Tröts        TNR     Titel                     Version  maxTL
So 02.06.2024 00:00:01     7.207       0      591.559    82,1 NerdCulture               4.2.9      500
Sa 01.06.2024 00:00:21     7.207      +1      591.100    82,0 NerdCulture               4.2.9      500
Fr 31.05.2024 00:00:12     7.206       0      590.475    81,9 NerdCulture               4.2.9      500
Do 30.05.2024 00:00:09     7.206       0      589.972    81,9 NerdCulture               4.2.8      500
Mi 29.05.2024 00:00:09     7.206      +1      589.451    81,8 NerdCulture               4.2.8      500
Di 28.05.2024 00:00:13     7.205       0      588.971    81,7 NerdCulture               4.2.8      500
Mo 27.05.2024 00:00:12     7.205      +1      588.366    81,7 NerdCulture               4.2.8      500
So 26.05.2024 00:00:11     7.204       0      587.854    81,6 NerdCulture               4.2.8      500
Sa 25.05.2024 00:00:11     7.204      +2      587.294    81,5 NerdCulture               4.2.8      500
Fr 24.05.2024 00:00:28     7.202       0      586.821    81,5 NerdCulture               4.2.8      500

So 02.06.2024 15:19

Ultrasonic Cold Brew Coffee :ablobcatcoffee:

Cold brew is supposed to take a long time (that’s part of how it gets its characteristic smoothness). But a group of engineers from the University of New South Wales have figured out a way to cut the time down from several hours to a mere 3 minutes, using ultrasonic waves.

unsw.edu.au/newsroom/news/2024

The study found that this arrangement is capable of doubling both the extraction yield and caffeine concentration, compared with non-soundblasted samples. The team sent samples of the coffee off to be evaluated on aroma, texture, flavor and aftertaste. Although the one-minute extraction samples received similar ratings to a 24-hour brew in terms of flavor and aftertaste, they lacked the intensity and dark chocolate aroma of the longer brew. But the three-minute extraction samples scored quite highly in all areas, suggesting that the average cold brew drinker wouldn’t be able to tell the difference.

The study found that this arrangement is capable of doubling both the extraction yield and caffeine concentration, compared with non-soundblasted samples. The team sent samples of the coffee off to be evaluated on aroma, texture, flavor and aftertaste. Although the one-minute extraction samples received similar ratings to a 24-hour brew in terms of flavor and aftertaste, they lacked the intensity and dark chocolate aroma of the longer brew. But the three-minute extraction samples scored quite highly in all areas, suggesting that the average cold brew drinker wouldn’t be able to tell the difference.

Interestingly, the UNSW Sydney engineers’ process uses a typical prosumer-grade espresso machine and involves blasting the portafilter with a transducer and a horn. This transforms the coffee basket into a sonoreactor. Sound waves at a frequency of 38.8 kHz are injected at multiple points through the walls, generating acoustic cavitation within. You can read all about it in Ultrasonics Sonochemistry.

Interestingly, the UNSW Sydney engineers’ process uses a typical prosumer-grade espresso machine and involves blasting the portafilter with a transducer and a horn. This transforms the coffee basket into a sonoreactor. Sound waves at a frequency of 38.8 kHz are injected at multiple points through the walls, generating acoustic cavitation within. You can read all about it in Ultrasonics Sonochemistry.

In the 90’s/early oughts iced coffee was mostly just leftover coffee dumped over ice. Progress has been made and now we all enjoy the full bodied, smooth tasting „cold brew“.

In the 90’s/early oughts iced coffee was mostly just leftover coffee dumped over ice. Progress has been made and now we all enjoy the full bodied, smooth tasting „cold brew“.

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