Premium
Dual Modification of Banana Starch: Partial Characterization
Author(s) -
CarmonaGarcia Roselis,
AguirreCruz Andrés,
YeeMadeira Hernani,
BelloPérez Luis A.
Publication year - 2009
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.200900152
Subject(s) - crystallinity , starch , chemical modification , swelling , sorption , chemistry , swelling capacity , modified starch , nuclear chemistry , sodium , absorption of water , chemical engineering , materials science , polymer chemistry , organic chemistry , adsorption , crystallography , engineering , composite material
Banana starch was double modified by cross‐linking and substitution, using two different cross‐linking agents, i.e. phosphorus oxychloride (POCl 3 ) and a mixture of sodium trimetaphosphate/sodium tripolyphosphate. The morphological and physicochemical properties and the absorption capacity for heavy metals of the modified starches were assessed. Double modified starch granules (cross‐linked carboxymethyl starches CCSA and CCSB) presented changes in the surfaces. These starches had a bigger average particle size than unmodified starch due to the swelling of the granules during the chemical modification, also aggregates were formed. The double modified banana starches presented an A‐type X‐ray diffraction pattern with slightly decreased crystallinity compared with the unmodified counterparts. The double modification of banana starch decreases the temperature and enthalpy of gelatinization and the decomposition temperature. These results are related to partial disorganization during the chemical treatment. The double modified banana starch possess sorption capacity for heavy metal ions in the order Cd 2+ >Pb 2+ >Cu 2+ >Hg 2+ . Due to their physicochemical characteristics and absorption capacity, the double modified banana starches can be used in diverse applications.