1 / 25

Chemistry for cooks - the alliteration

Discover the fascinating world of chemistry through observations, experiments, and practical applications. Learn the underlying principles behind chemical reactions and how chemists solve everyday problems.

jessejohnson
Download Presentation

Chemistry for cooks - the alliteration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chemistry for cooks - the alliteration Leo Gros, Noreen Klein, Sascha Klein Hochschule Fresenius CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  2. 1. Chemists are observers Szent-Györgyi (1925) - observation: patient brown skin (adrenalopathy) apple apple (just cut) (brown) apple apple (just cut) acids (brown) polyphenoloxidase citrus fruit juice CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  3. Szent-Györgyi (1925) isolated an active substance • „It had been an acid, it seemed to be descended from an unknown sugar, that I called „Ignose“ , the substance itself I called „Ignosinacid“. But the editor of the newspaper, to whom I send my publications, didn‘t like any jokes and rejected the name. „Godnose“ hadn‘t been anymore successful, therefore we agreed, the child ought to be called Hexuronacid. Later on, with advanced knowledge about the structure, it had to be renamed hastily and now it is called ascorbic acid (sometimes Vitamin-C-acid), since it is identical to Vitamin C and prevents scurvy. That's how I became a father without intending it, father of the Vitamin C.“ • Therefore: acid is good! CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  4. Ascorbic acid prevents polyphenoloxidase http://www.gartendatenbank.de/photo/2004012583 http://www.fao.org/ag/Ags/agsi/ENZYMEFINAL/Enzymatic%20Browning.html#ASCORB CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  5. CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  6. To observe something means, to see something, that has already been seen by many, and to think something that nobody has thought about before. CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  7. 2. Chemists know how to help themselves. A strange salt in the soup. www.schule-bw.de/unterricht/faecher/biologie/archiv/tiere/voegel/Huhn2.jpg/view CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  8. The revealing indicator CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  9. This way chemists see red light: http://www.ieap.uni-kiel.de/plasma/ag-stroth/lehre/physik/HTML/f40_08.html CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  10. Based on this phenomenon, Bunsen and Kirchhoff developed an analysis principle: http://lims.uni-duisburg.de/Lehre/Material/PMAll/vorproben.pdf CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  11. Today: Atomic emission is used in quantitative analysis CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  12. 3. Chemists have to remove dirt from the bathtub like anyone else –but they know where it comes from http://www.uni-essen.de/chemiedidaktik/S+WM/NachteileSeife/Wasserh.htm CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  13. That's what surfactants look like: http://de.wikipedia.org/wiki/Tenside CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  14. This is how chemists see calcium-surfactant precipitates - Ca 2+ - CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  15. 4. Chemists recognise the „underlying principles“: Three examples of effervescence – one principle NaHCO3 + C6H8O7 → NaC6H7O7 + H2O + CO2 H3O+ + HCO3- → H2CO3 + H2O → CO2 + 2 H2O • Brause (sherbet) • Schorle (spritzer) • Baking powder http://de.wikipedia.org/wiki/Brausepulver CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  16. 5. Chemists know the tricks:How garlic destroys „poison“(A story taking place at the Auer Dult near Munich) http://www.gartendatenbank.de/photo/2004012583 CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  17. Alliin   Allylsulfensäure    alpha-Aminoacrylsäure Allylsulfensäure                                             Allicin Alliin ((+)-(S)-Allyl-L-cysteinsulfoxid) That’s only one part of the „chemistry“ of garlic http://www.uni-bayreuth.de/departments/ddchemie/umat/knoblauch/knoblauch.htm#1 CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  18. An example of a chemical reaction using permanganate: (Determination of oxalic acid) http://www.chemie.uni-greifswald.de/~analytik/Lehre/Schr%F6der/Quanti/Wasserg%FCte.pdf CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  19. Water pollution in the Elbe river at the beginning of the 20th century. http://www.springerlink.com/content/k85400x365p3q37h/fulltext.pdf CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  20. Today in the labs it’s practiced like this: • Procedure: • The following determination is accomplished simultaneously with the water sample and distilled water • Prepare in a 400 mL beaker boiling water for a water bath • With a 25 mL pipette add of the water sample in a tall test tube and add 5 mL of a 2 mol sulphuric acid. Likewise 25 mL distilled water are mixed with 5 mL sulphuric acid. The test tubes are put in boiling water for ten minutes to adjust the temperature. • Add exactly 5 mL potassium permanganate in both test tubes and leave them for exactly 10 minutes in the water bath. After ten minutes constant boiling add to each test tube 5 mL oxalic acid • Afterwards the colourless, hot fluid with potassium permanganate is titrated until a light pink colouration persists for about 30 seconds http://www.xlab-goettingen.de/pics/medien/1_1097848861/Wasseruntersuchungen.pdf CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  21. A recent publication tells us more: Here we show that human RBCs convert garlic-derived organic polysulfides into hydrogen sulfide (H2S), an endogenous cardioprotective vascular cell signaling molecule…. The vasoactivity of garlic compounds is synchronous with H2S production, and their potency to mediate relaxation increases with H2S yield, strongly supporting our hypothesis that H2S mediates the vasoactivity of garlic. Gloria A. Benavides et al., http://www.pnas.org/cgi/content/abstract/0705710104v1 CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  22. Angew. Chem. 2009, S. 121, 163-166 CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  23. http://www.physics.ubc.ca/~stm/news0229.pdf CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  24. What does that teach us? CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

  25. How chemists see the world … they see molecules dancing where other people see nothing …and our benefit We understand our world better – we can make substances, transfer and measure them – and we learn about dangers and benefits of our actions CITIES Project N. 129193-CP-1-2006-1-DE–COMENIUS–C21

More Related