⁎ Corresponding author at: Sang-Do Ha, Dept. of Food Science and Technology,
Chung-Ang University, 72-1 Nae-ri, Daeduk-myun, Ansung, Gyunggido 456-756,
Republic of Korea. Tel.: +82 31 670 4831; fax: +82 31 675 4853.
E-mail address: sangdoha@cau.ac.kr (S.-D. Ha