TY - JOUR
T1 - Films made from plasma-modified corn starch
T2 - Chemical, mechanical and barrier properties
AU - Sifuentes-Nieves, Israel
AU - Flores-Silva, Pamela C.
AU - Gallardo-Vega, Carlos
AU - Hernández-Hernández, Ernesto
AU - Neira-Velázquez, Guadalupe
AU - Mendez-Montealvo, Guadalupe
AU - Velazquez, Gonzalo
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/6/1
Y1 - 2020/6/1
N2 - In this study, the chemical, mechanical and barrier properties of films made from plasma-modified corn starch (MSF) were evaluated as a function of the amylose content (30, 50 and 70 %). SEM analysis revealed the presence of remnant starch granules (RSG) in all films, which promoted the ordering of helices as suggested by the FTIR results. Moreover, XPS analysis was used to identify the oxidation mechanism in all MSF as the atomic proportion of hydroxyl, carbonyl and carboxyl groups changed. Also, the increase of C-C proportions suggested crosslinking in MSF70. TGA analysis indicated low interaction between starch and the plasticizer as the tensile strength and elongation at break diminished in MSF50 and MSF70 due to the low plasticizing effect of glycerol, the oxidation phenomena and the depolymerization of starch chains. However, the crosslinking of MSF70 showed characteristics of rigid films with good hydrophobic performance.
AB - In this study, the chemical, mechanical and barrier properties of films made from plasma-modified corn starch (MSF) were evaluated as a function of the amylose content (30, 50 and 70 %). SEM analysis revealed the presence of remnant starch granules (RSG) in all films, which promoted the ordering of helices as suggested by the FTIR results. Moreover, XPS analysis was used to identify the oxidation mechanism in all MSF as the atomic proportion of hydroxyl, carbonyl and carboxyl groups changed. Also, the increase of C-C proportions suggested crosslinking in MSF70. TGA analysis indicated low interaction between starch and the plasticizer as the tensile strength and elongation at break diminished in MSF50 and MSF70 due to the low plasticizing effect of glycerol, the oxidation phenomena and the depolymerization of starch chains. However, the crosslinking of MSF70 showed characteristics of rigid films with good hydrophobic performance.
KW - Crosslinking
KW - Oxidation
KW - Plasma
KW - Starch
KW - XPS
UR - http://www.scopus.com/inward/record.url?scp=85081067817&partnerID=8YFLogxK
U2 - 10.1016/j.carbpol.2020.116103
DO - 10.1016/j.carbpol.2020.116103
M3 - Artículo
C2 - 32241423
SN - 0144-8617
VL - 237
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
M1 - 116103
ER -