Chirality and the Origins of Life
A Case Study in Organic Chemistry
Department of Chemistry and Biochemistry
University of Toledo
Department of Chemistry
University of California, Riverside
In this case study, students are guided through an example of how the amplification of enantiomeric excess in prebiotic amino acids may have contributed to the occurrence of only L-amino acids in nature. By studying the mechanism of racemization of amino acids and their derivatives and applying the concepts of crystallization and equilibrium, students can critically analyze a recent (2008) article in the Journal of the American Chemical Society on chirality enhancement under conditions that mimic the prebiotic environment. The article provides a possible cause of single enantioforms of amino acids, and the case study extends this to critically investigate whether this is a viable theory for the existence of L amino acids as the sole natural constituents of natural macromolecules. This case study is designed for a first semester/first quarter organic chemistry course, and is generally presented in the middle of the course after the topics of stereochemistry and acid/base reactions are taught.
- Highlight the relevance of chemistry to current world issues.
- Apply basic organic chemistry knowledge to complex, multi-faceted problems.
- Develop the ability to critically analyze primary literature and draw conclusions based on the data and evidence contained therein.
- Develop the ability to communicate scientific and technical concepts in both written and verbal form to both technical and non-technical audiences.
- Assist in the development of fundamental organic chemistry skills such as stereochemistry and mechanism.
KeywordsOrganic reactions; racemization; stereochemistry; amino acids; origins of life
Educational LevelUndergraduate lower division
Type MethodsAnalysis (Issues), Discussion, Journal Article
Subject HeadingsOrganic Chemistry
Case teaching notes are password-protected and access to them is limited to paid subscribed instructors. To become a paid subscriber, begin the process by registering.
Teaching notes are intended to help teachers select and adopt a case. They typically include a summary of the case, teaching objectives, information about the intended audience, details about how the case may be taught, and a list of references and resources.
A PowerPoint slide show is provided for optional use by instructors as an introduction to the case.