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Chem. 231 – 4/8 Lecture

Chem. 231 – 4/8 Lecture. Announcements. Set 1 Lab Reports hand back Set 2 Lab Reports Due 4/10 Final Exam – April 15 th Future Mondays (after 4/15) Set 3 Presentation – 4/29 4/22 and other Mondays can’t start lab at 5:00 in Sequoia 538 ( Chem 125 conflict)

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Chem. 231 – 4/8 Lecture

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  1. Chem. 231 – 4/8 Lecture

  2. Announcements Set 1 Lab Reports hand back Set 2 Lab Reports Due 4/10 Final Exam – April 15th Future Mondays (after 4/15) Set 3 Presentation – 4/29 4/22 and other Mondays can’t start lab at 5:00 in Sequoia 538 (Chem 125 conflict) can run lab from 5:30 to 9:00 or 5:30 to 8:30 plus Wed from 5:00 to 8:00 or first 30 min of lab in Sequoia 540

  3. Labs – More Details Set 2 Lab Reports Real sample analysis will count for at most 25% of points (less for HPLC lab) Set 3 Labs We have tristearin and tripalmitin that can be used as recovery standards We also have old linoleic (C18:2) and linolenic (C18:3) acid standards that can be used as qualitative standards (these standards decompose easily) These are in 540 freezer You should be deciding on your “real” sample soon and let me know what other equipment or standards you will need

  4. Labs – More Details Set 3 Labs – cont. Tentative presentation and paper due dates Presentation 4/29 (1 week after finishing lab) Paper due 5/6 Presentation should be focused on your sample of interest and should include some literature research (why is this sample of interest and what analysis has been done previously)

  5. Labs – More Details Term Project You should figure out what you plan to do before next Monday Two options: isolation of significant ingredient from household product (best for 5 to 50% that ingredient) use of “new” equipment for analysis of compound from sample (e.g. use of HPLC-fluorescence detection for capsaicin in chile samples or analysis of caffeine in a beverage by SPME-GC-NPD) I will have a sign up limit to number of students using particular equipment for bulk of work (not a problem for isolation projects) only 1 student per household sample/ingredient you may want to have a back-up compound/plan

  6. Final Exam - Review Example posted on-line 15% of total grade Can use lab notebook and notes from lab lecture (including slide) What to know – from 1/28 lecture Understand goals of method optimization and measures of how well that is accomplished Basic safety rules How to transfer data (raw, chromatograms, and software table data) to Excel Steps to turning on and off HPLCs and GCs

  7. Final Exam - Review What to know – from 2/4 lecture Understand goals of simple extractions Know some equipment for the following types of extractions: solids into liquids gases into liquids gases into solids removal of solids from fluids liquid – liquid extraction solvent reduction How Soxhlet extraction works How gas trapping works Procedure to use SPME (for gases or liquid samples)

  8. Final Exam - Review What to know – from 2/4 lecture – cont. Requirements and selection of phases for liquid – liquid extractions Purpose of acid/base modifiers in liquid – liquid extractions What to know – from 2/11 lecture Basic calculations for liquid – liquid extractions (Q, Kp and KD) How to test for extraction efficiency and ways to improve extraction efficiency Main purpose and equipment with low pressure liquid chromatography and TLC

  9. Final Exam - Review What to know – from 2/11 lecture – cont. How to identify problems in integrating peaks Some ways to improve peak integration (be able to describe or give name of control in software) What to know – from 2/18 lecture How to calculate a limit of detection from a low conc. standard run Calibration Methods main types and rationales for use how to perform linear least squares analysis some sources of uncertainty how to use internal standard and surrogate standard methods

  10. Final Exam - Review What to know – from 2/25 lecture Advantages to GC methods Limitation of GC methods to certain analytes/samples Requirements to use GC for permanent gases and non-volatile compounds What to know – from 3/4 lecture SPE use procedure Basic structure of phenols and monterpenes Factors to consider when selecting HPLC solvents Advantages/disadvantages to low and high pressure mixing

  11. Final Exam - Review What to know – from 3/11 lecture SPE use procedure How HPLC pumps and injectors work How to avoid peak broadening associated with injection Know how column dimensions (both GC and HPLC) affect separation performance Know the difference in needs between selective and universal detectors

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