Determination of the degree of acetylation (DA) of chitin and chitosan
by an improved first derivative UV method.
Wu T.,
Zivanovic S. 2008. Carb Polym. 73:248-253.
PDF [260 K]
An economical and accurate determination of degree of acetylation (DA)
for highly acetylated chitin has always been a challenge for researchers
dealing with chitin and chitosan. A new protocol for the first
derivative UV method using concentrated phosphoric acid as a solvent for
highly acetylated chitin was developed in this study. The solvent was
proposed based on thorough investigation of the effects of associated
reactions including chain degradation, monomer dehydration, and
oxazolinium ion formation. The reproducibility and performance of the
new protocol was evaluated using commercial samples and the results
showed the DA values of both chitin and chitosan could be determined
accurately by a single analytical technique in less than 3 h.
An
improved first derivative UV method to determine the degree of
deacetylation for chitin and chitosan.
Wu T.,
Zivanovic S. 2006. Institute of Food Technologists Annual Meeting; June
24-28, 2006; Orlando, FL. Abstract 078A-02.
In-vitro calcium binding studies using ionic selective electrode and ICP-MS.
Deng X,
Zivanovic S, Sams CE, Beelman RB. 2008. Institute of Food Technologists
Annual Meeting; June 28-July 1, 2008; New Orleans, LA.
Comparison of calcium-induced firmness in mushroom, fruit and vegetable
by in vitro binding.
Deng X.,
Zivanovic S., Sams C., Beelman B. 2007. 234th ACS National Meeting,
Boston, MA, August 19-23, 2007.
Mechanisms of calcium-induced firmness in mushrooms.
Deng X.Y.,
Zivanovic S., Sams C.E., Beelman R.B. 2007. Institute of Food
Technologists Annual Meeting; July 28-August 1, 2007; Chicago, IL.
Production of hydroxymethylfurfural (HMF) from glucosamine and
glucosamine-rich renewable materials.
Wu T.,
Zivanovic S. 2007. 234th ACS National Meeting, Boston, MA, August 19-23,
2007.
Kinetics of formation of 5-hydroxymethyl-furfural (HMF) from
glucosamine.
Wu T.,
Zivanovic S. 2005. 230th American Chemical Society National meeting;
August 28 - September 1, 2005, Washington, D.C. Abstract #174.
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