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Orange Peels Lab Report

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In the lab “Isolation of R- (+) Limonene from Orange Peels”, we were able to isolate the essential oil limonene from orange peels and characterize it by IR, NMR, and polarimetry. The Infrared (IR) Spectrum was used to identify the different structures in the limonene. The Nuclear Magnetic Resonance (NMR) Spectrum was also used to identify the different structures in the limonene. During lab, we were unable to get to analyze the limonene from polarimetry due to time constraints. To isolate the limonene from the orange peel, we used Steam Distillation and Microscale Extraction. By boiling the mixture of blended peels and 100 mL of water, the limonene and water vapors can separate from the orange peel and into a beaker set at the end of the …show more content…

One peak was located at ~5.45 ppm which we were able to identify the H off of the C=CH structure. The other peak was located at ~4.75 ppm which we were able to identify the two Hs bonded to the C off of the C=CH2 structure. Although we did not get to the polarimetry, polarimetry is important to identify the optical activity of the pair of enantiomers in the limonene structure. The process of measuring the activity of a pair of enantiomers involves light being shined through a set of filters. The detector in the machine will measure the optical activity of the pair of enantiomers. By measuring the optical activity, we can then calculate the specific rotation of limonene and determine if the limonene that we collected is R-limonene or S-limonene. Enantiomeric excess can also be calculated from polarimetry. Using Steam Distillation and Microscale Extraction, we were able to isolate limonene. Using H NMR and IR spectroscopy, we were able to identify important structures in the limonene structure. As a group, we were not able to conduct the polarimetry part of the lab due to time

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