Abstracts Book - IMRC 2018

• SB6-P059
ADDITION OF GALACTOMANNANS AND CITRIC ACID IN CORN
STARCH PROCESSED BY EXTRUSION: RETROGRADATION AND
RESISTANT STARCH STUDIES
Erich Von Borries Medrano 1 , Monica Rosalía Jaime Fonseca 1 , Miguel Angel Aguilar Méndez 1 ,
Héctor Iván García Cruz 1
1 Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Legaría, IPN, Laboratorio
de Biomateriales, Mexico.
Starch-galactomannan mixtures were elaborated by extrusion using a general
factorial statistic design with three variables: galactomannan type (guar gum,
tara gum and locust bean gum) at 10% (w/w), citric acid concentration (2.5% w/w)
and storage time at 4 ºC (7 days). Galactomannan type, citric acid concentration
and storage time were factors that affected the physicochemical properties and
microstructure of extrudates. Crystallinity of starch-guar gum extruded samples
was higher compared with the samples obtained with the addition of the other
gums and presented a variation 3.38 ± 0.16 to 6.68 ± 0.23 when citric acid was
added and stored at 4 ºC and showed a correlation between long-range order
(X-ray diffraction) and short-range order (FTIR). These results demonstrated the
influence of the different galactomannans, the addition of citric acid and the
storage at 4 ºC of the samples, which resulted in an increase in the formation of
V-type amorphous structures. The DSC analysis demonstrated the formation of
amylose-lipid complexes in which transitions temperatures started at above 90
ºC, these structures may slow retrogradation rates of samples. In addition, these
complexes can act as a part of resistant starch found in samples, which varies
4.64 ± 0.15 to 12.13 ± 0.30 g/100 g sample in different extrudates. Overall,
galactomannan type, citric acid concentration and storage time were factors
that significantly affected the properties and resistant starch content of
extruded samples.
Acknowledgment: We thank the Instituto Politécnico Nacional (IPN), the
Consejo Nacional de Ciencia y Tecnología (CONACYT, Project 180378) Mexico
and the Comisión de Operación y Fomento de Actividades Académicas del IPN
(COFAA) Mexico, for funding this project.
Keywords: Corn starch, Galactomannans, Resistant starch
Presenting authors email: evborries@hotmail.com