American Journal of Chemical and Biochemical Engineering

Archive

Volume 7, Issue 2, December 2023

  • An Overview of Techniques for Extracting Caffeine from Coffee for Quantification

    Kasahun Wale, Bealu Girma

    Issue: Volume 7, Issue 2, December 2023
    Pages: 15-19
    Received: Jun. 27, 2023
    Accepted: Jul. 17, 2023
    Published: Jul. 31, 2023
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    Abstract: Coffee is one of the most important agricultural commodities. Of the coffee alkaloids, caffeine is the most common component. Caffeine in coffee affects the central nervous system, heart muscle, respiratory system, and stomach secretion, impacting health and defining the quality of the beverage. However, excessive caffeine consumption has health ha... Show More
  • Research Article

    Color Lightening Chemical Treatments for the Improvement of the Deep Red Colored Ruby Stones’ Quality

    Hebah Abdel-Wahab*, Tamara Gund, Joseph Bozzelli

    Issue: Volume 7, Issue 2, December 2023
    Pages: 20-23
    Received: Nov. 30, 2023
    Accepted: Dec. 15, 2023
    Published: Dec. 26, 2023
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    Abstract: Corundum mineral species include rubies and sapphires. The mineral corundum is a natural gemstone mined from earth, and is colorless in its purest form. Variations of its color can be caused by trace elements that become part of the mineral crystal structure. Ruby is a crystalline form of aluminum oxide (Al2O3) in a closed packed hexagonal structur... Show More