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Poly(l -Ala- co- l -Lys) Exhibits Excellent Ice Recrystallization Inhibition Activity

Title
Poly(l -Ala- co- l -Lys) Exhibits Excellent Ice Recrystallization Inhibition Activity
Authors
Piao Z.Park J.K.Patel M.Lee H.J.Jeong B.
Ewha Authors
정병문Madhumita Patel
SCOPUS Author ID
정병문scopus; Madhumita Patelscopus
Issue Date
2021
Journal Title
ACS Macro Letters
ISSN
2161-1653JCR Link
Citation
ACS Macro Letters vol. 10, no. 11, pp. 1436 - 1442
Publisher
American Chemical Society
Indexed
SCIE; SCOPUS scopus
Document Type
Article
Abstract
The control of ice recrystallization is very important in cryo-technological fields such as the food industry, biopharmaceuticals, and cell storage. Ice recrystallization inhibition (IRI) compounds are therefore designed to limit the growth of ice crystals, decrease the crystal size, and control the crystal shape. To improve the IRI activity of cryo-systems, various synthetic polymers such as biomimetic polypeptides from polar fish, facially amphiphilic polymers, polyampholytes, poly(vinyl alcohol) derivatives, and block copolymers with hydrophilic-hydrophobic balance have been developed. Except for graphene oxide, poly(vinyl alcohol) has thus far exhibited the best performance among these polymers. Herein, poly(l-alanine-co-l-lysine) (PAK) was shown to exhibit a similar IRI activity to that of poly(vinyl alcohol). Moreover, in contrast to the needle-shaped ice crystals generated by the aqueous PVA solution, the PAK solution was shown to generate cubic-to-spherical shaped ice crystals. Furthermore, neither poly(l-alanine-co-l-aspartic acid) (PAD) nor poly(ethylene glycol) (PEG) with a similar molecular weight provided any significant IRI activity. Examination by FTIR and circular dichroism spectroscopies indicated that the PAK forms α-helices, whereas the PAD forms random coils in water. Further, a dynamic ice shaping study suggested that PAK strongly interacts with ice crystals, whereas PAD and PEG only weakly interact. These results suggest that PAK is an important compound with superior IRI activity and that this activity is dependent upon the functional groups and secondary structure of the polypeptides. © 2021 American Chemical Society.
DOI
10.1021/acsmacrolett.1c00584
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자연과학대학 > 화학·나노과학전공 > Journal papers
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