Below is an IR spectrum from a simple steam distillation extraction of essential

Question

Below is an IR spectrum from a simple steam distillation extraction of essential oil from an orange.

A. What evidence in the above IR spectrum do you find for what major functional groups that are present in limonene?

B. What signals do you observe in the above IR spectrum that are coming from a substance other than limonene?

C. What are some issue in a simple steam distillation essential oil extraction from an orange that might have affected yield and purity of the isolated essential oil?

Varian Resolutions Pro Multi 80- 70 50- 40- 30 3400 3800 3600 Name 1 Mul Spectra 2 Mul Spectra 3 Multi-Spectral 4 Mul Spectra 3200 3000 2300 2600 2400 Wavenumber 2200 2000 1800 1600 1400 1200 10

Explanation / Answer

A.

expect strong peaks in 3000 area, those are C=C bonds from th elimonene

B

th epeak in 1700 range, are typically associated to C=O

C

The extraction was not performed 100% for unique species

so the extract has another species as well, most likely a ketone or C=O containig material

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