Characterization of Starch Polymorphic Structures Using Vibrational Sum Frequency Generation Spectroscopy

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dc.contributor.authorKong, Lingyan
dc.contributor.authorLee, Christopher
dc.contributor.authorKim, Seong H.
dc.contributor.authorZiegler, Gregory R.
dc.contributor.otherPennsylvania Commonwealth System of Higher Education (PCSHE)
dc.contributor.otherPennsylvania State University
dc.contributor.otherPennsylvania State University - University Park
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2020-05-20T15:56:19Z
dc.date.available2020-05-20T15:56:19Z
dc.date.issued2014-01-16
dc.description.abstractThe polymorphic structures of starch were characterized with vibrational sum frequency generation (SFG) spectroscopy. The noncentrosymmetry requirement of SFG spectroscopy allows for the detection of the ordered domains without spectral interferences from the amorphous phase and also the distinction of the symmetric elements among crystalline polymorphs. The V-type amylose was SFG-inactive due to the antiparallel packing of single helices in crystal unit cells, whereas the A- and B-type starches showed strong SFG peaks at 2904 cm(-1) and 2952-2968 cm(-1), which were assigned to CH stretching of the axial methine group in the ring and CH, stretching of the exocyclic CH2OH side group, respectively. The CH2/CH intensity ratios of the A- and B-type starches are significantly different, indicating that the conformation of hydroxymethyl groups in these two polymorphs may be different. Cyclodextrin inclusion complexes were also analyzed as a comparison to the V-type amylose and showed that the head-to-tail and head-to-head stacking patterns of cyclodextrin molecules govern their SFG signals and peak positions. Although the molecular packing is different between V-type amylose and cyclodextrin inclusion complexes, both crystals show the annihilation of SFG signals when the functional group dipoles are arranged pointing in opposite directions.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationKon g, L., Lee, C., Kim, S., Ziegler, G. (2014): Characterization of Starch Polymorphic Structures Using Vibrational Sum Frequency Generation Spectroscopy. The Journal of Physical Chemistry B, 118(7). DOI:https://doi.org/10.1021/jp411130n
dc.identifier.doi10.1021/jp411130n
dc.identifier.orcidhttps://orcid.org/0000-0002-3881-649X
dc.identifier.orcidhttps://orcid.org/0000-0002-4775-0226
dc.identifier.urihttp://ir.ua.edu/handle/123456789/6776
dc.languageEnglish
dc.language.isoen_US
dc.publisherAmerican Chemical Society
dc.subjectCYCLODEXTRIN INCLUSION COMPLEXES
dc.subjectPLANT-CELL WALLS
dc.subjectCRYSTAL-STRUCTURE
dc.subjectMOLECULAR-STRUCTURE
dc.subjectX-RAY
dc.subjectPACKING ANALYSIS
dc.subjectAMYLOSE COMPLEXES
dc.subjectSINGLE-CRYSTALS
dc.subjectVH-AMYLOSE
dc.subjectALPHA
dc.subjectChemistry, Physical
dc.subjectChemistry
dc.titleCharacterization of Starch Polymorphic Structures Using Vibrational Sum Frequency Generation Spectroscopyen_US
dc.typetext
dc.typeArticle
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