Amino acid — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Amino acid tildeles normalt ved at lede efter en tilbagevendende klynge af karakteristiske toppe frem for et præcist lærebogsnummer. Tabellen nedenfor viser, hvor litteraturen oftest placerer denne gruppe i FTIR, rangeret efter akkumuleret evidens.

Karakteristiske FTIR-toppe for Amino acid

Viser de 30 bedst understøttede toppe ud af 152 i alt for Amino acid.

Spektrumlogik

En funktionel gruppetildeling bliver mere sikker, når flere forventede bånd optræder sammen. Brug denne side til at finde de bedst understøttede peaks, og bekræft derefter, at den samme prøve udviser et sammenhængende mønster snarere end et enkelt isoleret hit.

Anvendelse i virkeligheden

Disse sider er nyttige til analyse af ukendte materialer, topforklaring i rapporter, polymerfejlfinding og verifikation af, om en kandidatmaterialefamilie er kemisk plausibel.

Almindelige fejl

• Brug af én funktionel-gruppe-side som en komplet materialebedømmelse uden at kontrollere resten af spektret.
• Antager, at det stærkeste bånd altid er det mest diagnostiske.
• At glemme, at forarbejdning, tilsætningsstoffer, ældning og blandinger kan flytte eller udvide forventede toppe.

Verifikationsrådgivning

Brug DSC, GC-MS eller TGA, når flere materialefamilier deler lignende bånd, eller når blandings-effekter gør FTIR-tildelingen usikker.

Litteratur bag disse tildelinger

• 1029 cm⁻¹ tillid 1,0

  “Earlier studies have established that the FTIR bands stretching in amino acid has also caused a band at 1029 cm-1 [18,19].”

  Aziz 等 - 2017 - From Insulating PMMA Polymer to Conjugated Double DOI: 10.3390/polym9110626
• 1610 cm⁻¹ tillid 1,0

  “The cm-1 is increasing with increasing temperweak band at 1610 ature and may tentatively be assigned to the amino acid side chain in tyrosine (23).”

  Bertram 等 - 2006 - Heat-induced changes in myofibrillar protein struc DOI: 10.1021/jf0514726
• 1234 cm⁻¹ tillid 1,0

  “stretching mode of groups of serine, threonine, and tyrosine of proteinEE A comparison of the spectra showed significant changes in AmideIII(NAHbending,CANstretch,CACstretch) 1234 Amide III absorbance throughout the whole range tested, i.e.”

  Application of infrared spectroscopy in the identification of Ewing sarcoma: A preliminary report DOI: 10.1016/j.infrared.2017.05.006
• 1607 cm⁻¹ tillid 1,0

  “The bands cm-1) originating from the amino acid side chains vibrations are also observed (1607 [21].”

  A Preliminary Study of FTIR Spectroscopy as a Potential Non-Invasive Screening Tool for Pediatric Precursor B Lymphoblastic Leukemia DOI: 10.3390/molecules
• 3441 cm⁻¹ tillid 1,0

  “Regions of approximately 2352-2938 (-C-C2 cm-1 H-) alkyl absorption peaks and approximately 3441 (-N-H-) amino acid absorption peaks were observed.”

  Chang 等 - 2017 - Material Characteristics of Hair Cuticles after Ha DOI: 10.18494/SAM.2017.1707
• 1731 cm⁻¹ tillid 1,0

  “A band at 1731 represents characteristic of cm-1 α-amino acid hydrochlorides.”

  Crystal Growth, Spectral, Optical, Laser damage, Photoconductivity and Dielectric Properties of Semiorganic L-cystine hydrochloride Single Crystal DOI: 10.1016/j.saa.2015.06.113
• 1400 cm⁻¹ tillid 1,0

  “II band at 1400 indicates the generation of amino acids β-Carotene confirming Bioaccessibility of in In Vitro Digestion.”

  Remodeling of β‑Carotene-Encapsulated Protein-Stabilized Nanoparticles during Gastrointestinal Digestion In Vitro and in Mice DOI: 10.1021/acs.jafc.0c05322
• 2360 cm⁻¹ tillid 1,0

  “The medium doublet bands around 2360 revealed the typical S-H stretching of L-cysteine amino acid, which suggested the possible”

  Mesoporous magnetite nanoparticles synthesis using the Peltophorum pterocarpum pod extract, their antibacterial efficacy against pathogens and ability to remove a pollutant dye DOI: 10.1016/j.molstruc.2018.10.042