Which coffee has the most caffeine: Arabica, Robusta, Liberica or Excelsa?

Liberica coffee contains significantly more caffeine than Arabica, according to some studies. However, other studies suggest that Liberica has considerably less caffeine than Arabica. What’s the truth? We delve into this question in this video. If you can’t wait for the results, here are the measurements: Caffeine in mg/dl – Prepared as CGI Cupping: Canephora (Robusta) - India Parchment: 93.5 Arabica - Brazil Catuai & Bourbon: 55.2 Arabica - Ethiopia Yirgacheffe: 51.2 Liberica - Malaysia MyLiberica: 42.4 Liberica - Malaysia House of Kendall: 64.0 Excelsa - India Mara Kaapi: 56.9 Chlorogenic Acid in mg/dl – Prepared as CGI Cupping: Canephora (Robusta) - India Parchment: 97.8 Arabica - Brazil Catuai & Bourbon: 66.2 Arabica - Ethiopia Yirgacheffe: 78.9 Liberica - Malaysia MyLiberica: 63.1 Liberica - Malaysia House of Kendall: 93.1 Excelsa - India Mara Kaapi: 114.5 Density in g/l: Canephora (Robusta) - India Parchment: 811 Arabica - Brazil Catuai & Bourbon: 752 Arabica - Ethiopia Yirgacheffe: 799 Liberica - Malaysia MyLiberica: 777 Liberica - Malaysia House of Kendall: 813 Excelsa - India Mara Kaapi: 802 Used Equipment: Sample Roaster: Nucleus Link https://roastrebels.com/en/nucleus-link/ Density Measurement: Lighttells MD-500 https://roastrebels.com/en/roasting-a... Caffeine & CGA: Lighttells CA-700 https://roastrebels.com/en/roasting-a... Video with Tobias Seewer on Liberica & Excelsa:    • Liberica Coffee - introduction & roasting ...   Liberica Green Coffee from Kebun Malaya: https://www.kebunmalaya.com/ Chapters: 0:00 Measurement Methods and Equipment 2:08 Arabica, Canephora, Liberica, Excelsa 3:29 Taste of Arabica, Canephora, Liberica, Excelsa 9:03 Density of Arabica, Canephora, Liberica, Excelsa 11:45 Caffeine Content of Arabica, Canephora, Liberica, Excelsa 19:59 More Information ▬ About the Nucleus Link sample roaster ▬▬▬ The Nucleus Link is a highly accurate convection roaster. It has been specifically designed as a sample roaster - in particular, it allows the same roast to be produced regardless of external conditions. This makes it perfect for communication between coffee growers, traders and roasters, and as a sample roaster for farm visits. The unit comes in a shockproof box and with accessories to determine the density of the beans. It also comes with an app that selects the appropriate settings for the machine based on the altitude, type and density of the beans. Thanks to its ease of use, the machine is also suitable for ambitious and quality-conscious home roasters. You can find more about the roaster here: https://roastrebels.com/en/nucleus-link/ ▬ About this channel ▬▬▬▬▬▬▬▬▬▬▬▬ At Roast Rebels, our mission is to make coffee roasting easy. On the one hand we offer the most proven small scale roasting machines and high quality green coffees, on the other hand we want to support people who roast coffee with tips, knowledge, roasting profiles and tutorials to achieve good roasting results quickly.