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Table 2

Changes in the absorbance of pumpkin, melon and sunflower oils at 232 and 268 nm after microwave (MW) and conventional heating.

τ, min Pumpkin seed oil  Melon seed oil     Sunflower oil   
  MW heating Conventional heating MW heating Conventional heating  MW heating  Conventional heating
  600W 900W   600W 900W   600W 900W  
232 nm          
   0 0.937 ± 0.017a 0.937 ± 0.017a 0.937 ± 0.017a 3.050 ± 0.050a 3.050 ± 0.050a 3.050 ± 0.050a 0.996 ± 0.008a 0.996 ± 0.008a 0.996 ± 0.008a
   3 1.053 ± 0.010b 1.150 ± 0.015c * 3.056 ± 0.015b 3.190 ± 0.011c 0.999 ± 0.010bc 1.010 ± 0.010b,c
   6 1.102 ± 0.009b 1.165 ± 0.020c 3.120 ± 0.010b 3.214 ± 0.015c 1.020 ± 0.005c 1.031 ± 0.015c
   9 1.117 ± 0.015d 1.196 ± 0.006e 1.564 ± 0.040f 3.228 ± 0.018d 3.242 ± 0.020e 3.264 ± 0.015f 1.028 ± 0.012d 1.039 ± 0.009d 1.281 ± 0.012e
   12 1.142 ± 0.005g 1.339 ± 0.010h 1.588 ± 0.010i 3.256 ± 0.020d 3.244 ± 0.014e 3.356 ± 0.008f 1.054 ± 0.007f 1.066 ± 0.005g 1.456 ± 0.015h
   18 1.678 ± 0.005j 3.536 ± 0.012g 1.486 ± 0.008i
268 nm          
   0 0.406 ± 0.006a 0.406 ± 0.006a 0.406 ± 0.006a 1.604 ± 0.008a 1.604 ± 0.008a 1.604 ± 0.008a 0.181 ± 0.004a 0.181 ± 0.004a 0.181 ± 0.004a
   3 0.403 ± 0.003a 0.388 ± 0.006a 1.584 ± 0.010b 1.554 ± 0.004c 0.165 ± 0.005a 0.171 ± 0.010a
   6 0.407 ± 0.007a 0.391 ± 0.005a 1.608 ± 0.008b 1.556 ± 0.009c 0.170 ± 0.003a 0.193 ± 0.009a
   9 0.410 ± 0.005b 0.404 ± 0.004b 0.513 ± 0.009c 1.628 ± 0.005b 1.560 ± 0.007c 1.544 ± 0.004c 0.181 ± 0.008b 0.197 ± 0.007c 0.323 ± 0.006d
   12 0.417 ± 0.007d 0.417 ± 0.007d 0.557 ± 0.007e 1.644 ± 0.004b 1.602 ± 0.002a 1.566 ± 0.007a 0.186 ± 0.010e 0.198 ± 0.012f 0.438 ± 0.009g
   18 0.573 ± 0.005f 1.574 ± 0.005c 0.441 ± 0.004h

Values are means ± SD (n = 3). Different letters in the same oil mean significant differences (p ˂ 0.05) using Duncan test.

*

No heating was performed at this period of time.

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