Change in content of sugars and free amino acids in potato tubers under short-term storage at low temperature and the effect on acrylamide level after frying.
Changes in the sugar and amino acid contents of potato tubers during short-term storage and the effect on the acrylamide level in chips after frying were investigated. The acrylamide content in chips began to increase after 3 days of storage at 2 degrees C in response to the increase of glucose and fructose contents in the tubers. There was strong correlation between the reducing sugar content and acrylamide level, R(2)=0.873 for fructose and R(2)=0.836 for glucose. The sucrose content had less correlation with the acrylamide content because of its decrease after 4 weeks of storage at 2 degrees C, while the reducing sugar in potato tubers and the acrylamide in chips continued to increase. The contents of the four amino acids, i.e., asparatic acid, asparagine, glutamic acid and glutamine, showed no significant correlation with the acrylamide level. These results suggest that the content of reducing sugars in potato tubers determined the degree of acrylamide formation in chips. The chip color, as evaluated by L* (lightness), was correlated well with the acrylamide content.
Ohara-Takada
Akiko
A
Department of Upland Agriculture, National Agricultural Research Center for Hokkaido Region, Memuro, Hokkaido 082-0071, Japan. aohara@affrc.go.jp
Matsuura-Endo
Chie
C
Chuda
Yoshihiro
Y
Ono
Hiroshi
H
Yada
Hiroshi
H
Yoshida
Mitsuru
M
Kobayashi
Akira
A
Tsuda
Shogo
S
Takigawa
Shigenobu
S
Noda
Takahiro
T
Yamauchi
Hiroaki
H
Mori
Motoyuki
M
D020106:Acrylamide / Q000378:metabolism*; D000596:Amino Acids / Q000378:metabolism*; D001216:Asparagine / Q000032:analysis; D001224:Aspartic Acid / Q000032:analysis; D050260:Carbohydrate Metabolism; D002851:Chromatography, High Pressure Liquid; D003080:Cold Temperature; D003116:Color; D003296:Cooking / Q000379:methods*; D005511:Food Handling / Q000379:methods; D005519:Food Preservation / Q000379:methods; D005632:Fructose / Q000032:analysis; D005947:Glucose / Q000032:analysis; D018698:Glutamic Acid / Q000032:analysis; D005973:Glutamine / Q000032:analysis; D011198:Solanum tuberosum / Q000737:chemistry*; D013997:Time Factors
D000596:Amino Acids; D005973:Glutamine; D020106:Acrylamide; D005632:Fructose; D001224:Aspartic Acid; D018698:Glutamic Acid; D001216:Asparagine; D005947:Glucose