I used FT-IR to analyze the amorphous and crystalline region. I did not find the peak at 995, 1022 and 1047cm−1 as other researchers for starch and flour samples but I found those peaks (929, 1016, and 1080 cm−1) in my study.
your question is little bit complicated can you simplify it? what did you find and what you were looking for?
First of all crystalline character can not be define by FTIR unless you know particular phase at that condition
The bands at 1022 and 1047 cm-1 have been inferred to amorphous and crystalline in starch. By taking the ratio of two these bands, many researchers interpreted their results in terms of changing of amorphous and crystalline region in the starch. The ratio also has been used to determine the order in more crystalline regions and it is associated to the degree of retrogradation in starch samples.
The books listed hereunder may provide you a scope for suitable representation of your queries related to FTIR bands and interpretations (1) Socrates George,(2004)Infrared and Raman Characteristic group frequencies: tables and charts. John Wiley & Sons Ltd. England and (2)Crottes, John;(2000)Interpretation of Infrared spectra, A practical approach; In Encyclopedia of Analytical Chemistry, R.A. Meyers (ed),John Willey & Sons Ltd.
Yes, you can say it, generally, with change in phase, the energy required to vibrate the molecule or particular group is changing, indirectly shift the position of band which indicated the change in phase. But if the same band is available from the beginning then its not appropriate to conclude anything
The peaks 1022 & 1047 cm-1, is the C-O st., which the carbon has primary in nature. This could be formed during your crystallization process with the respective solvent / water. Check by changing the solvent for crystallization or use anhydrous solvent or use dried sample for crystallization
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology
- Nano