Journal of Analytical Science and Technology

Table 2 Results of ID-GC/MS measurements for homogenized samples of spinach and kimchi cabbage powders at three different time periods

From: Quantitative analyses of essential fatty acids in cereals and green vegetables by isotope dilution-gas chromatography/mass spectrometry

Periods	Subsample No.	Results by ID-GC/MS (mg/kg) ^a
		Spinach powder		Kimchi cabbage powder
		Linoleic acid	α-Linolenic acid	Linoleic acid	α-Linolenic acid
1	1	6447 ± 136	19947 ± 820	1387 ± 30	9441 ± 338
	2	6350 ± 187	19694 ± 793	1362 ± 30	9523 ± 376
	3	6385 ± 131	19882 ± 753	1366 ± 30	9444 ± 306
	Mean	6394	19841	1372	9469
	SD^b	49 (0.77%)	131 (1.32%)	13 (0.98%)	47 (0.49%)
2	1	6248 ± 173	19657 ± 368	1373 ± 32	9447 ± 281
	2	6338 ± 173	19850 ± 482	1365 ± 29	9673 ± 144
	3	6429 ± 177	19337 ± 592	1337 ± 33	9319 ± 180
	Mean	6338	19615	1358	9480
	SD^b	91 (1.43%)	259 (1.32%)	19 (1.39%)	179 (1.89%)
3	1	6301 ± 246	19980 ± 470	1320 ± 56	9645 ± 224
	2	6333 ± 244	19764 ± 461	1318 ± 51	9609 ± 227
	3	6350 ± 252	19965 ± 493	1349 ± 57	9698 ± 226
	Mean	6328	19903	1329	9651
	SD^b	25 (0.39%)	121 (0.61%)	17 (1.31%)	45 (0.46%)
Overall mean		6353	19786	1353	9533
SD among periods^c		36 (0.56%)	152 (0.77%)	22 (1.61%)	102 (1.07%)

^aThe number following “±” is the expanded uncertainty with a 95% confidence level for the measurement value.
^bThe standard deviation (SD) was determined among three values obtained within the period.
^cThe standard deviation (SD) was determined among three mean values obtained at different time points.

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