Why does the IR spectrum of caffeine contain two carbonyl peaks?

The IR spectrum of caffeine contains two carbonyl peaks because caffeine is made up of two different carbonyl groups. Both peaks are due to an amide, with one amide frequency being higher than the other.

Why is the IR spectrum down?

In the IR spectrum we see that the spectra are plotted upside down because it records the amount of light reaching the detector, i.e. transmission in place of the absorbance. In other words, the absorption peak points downward as it is inverted by the transmittance of the radiation through the sample.

How pure is caffeine in infrared spectra?

Results By analyzing the infrared spectra of 17 mixed samples of caffeine and sodium benzoate （the purity of caffeine ranges from 10% to 80%）, the characteristic absorption peaks for caffeine were determined to be 1 698, 1 650, 1 237, 972, 743, and 609 cm -1.

Is there a way to monitor caffeine consumption?

The monitoring of caffeine is very important aspect because of its consumption in higher doses that can lead to various physiological disorders. This paper incorporates various spectrophotometric methods used in the analysis of caffeine in various environmental samples such as pharmaceuticals, soft and energy drinks, tea, and coffee.

How to determine the amount of caffeine in a beverage?

Spectrophotometric Determination of Caffeine in Beverages It is very important aspect to estimate the content of caffeine in various beverages. The second- and third-order derivative spectrophotometric method was used for the determination of caffeine in cola, coffee, and tea [ 27

What is the concentration of Q-absorbance of caffeine at 273 NM?

In this study first method involved the simultaneous equation method and absorption of caffeine was recorded at 273 nm ( ), while the other method involves the formation of Q-absorbance equation at isosbestic point at 259.5 nm. From both methods linearity concentration range was 2–2.3 μ g/mL for caffeine.