High resolution imaging of native wheat and potato starch granules based on local mechanical contrast
PBN-AR
Instytucja
Instytut Agrofizyki im. Bohdana Dobrzańskiego Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
JOURNAL OF FOOD ENGINEERING
ISSN
0260-8774
EISSN
Wydawca
ELSEVIER SCI LTD
DOI
Rok publikacji
2014
Numer zeszytu
Strony od-do
96-102
Numer tomu
128
Identyfikator DOI
Liczba arkuszy
Autorzy
Pozostali autorzy
+ 3
Słowa kluczowe
en
Starch granules; Atomic force microscopy; Growth rings; Morphology; Stiffness; Friction
Streszczenia
Język
en
Treść
We studied the nano-scale properties of dry native starch granules of wheat and potato by atomic force microscopy. Whereas at the macroscale the mechanical behavior of starch powders is known, its origin at sub-granule level has still to be understood. We observed fine morphological structures, such as the growth rings and blocklet domains, with minor differences between the two starches. The granules, embedded in resins with known stiffness, were analyzed with lateral-force, force-distance and force-modulation microscopy. Integer granules exhibited a similar friction coefficient to the tip, decreased with respect to the embedding resin, without occurrence of stick-slip. The compressive modulus measured was also similar for both starch types (∼1.4 GPa in indentation and ∼2.0 GPa in dynamic mode), with slightly higher values for potato starch. On sectioned granules, the effect of aging in air likely due to moisture produced in both starches a strong reduction in apparent modulus (∼0.2 GPa).
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
590846
CrossrefMetadata from Crossref logo
Cytowania
Liczba prac cytujących tę pracę
Brak danych
Referencje
Liczba prac cytowanych przez tę pracę
Brak danych