. 2020 Sep 23;25(19):4363. doi: 10.3390/molecules25194363

Table 1.

Volatile compounds derived from glucosinolates in variable conditions within the kohlrabi tissue.

Compound Name	RRI_exp	RRI_lit	H₂O	Fe²⁺	Ag⁺	Fe³⁺	CaCl₂ sat. ¹	Cu²⁺	Na₂SO₄ anh. ²
sinigrin potassium salt
but-3-enenitrile	1169	1166 [14]	84767 ^@,b	1081935 *^,a	16794 ^#,b	-	52008 ^#,b	1231764 ^$,a	23012 ^$,b
3-isothiocyanatoprop-1-ene	1356	1383 [15]	21509589 ^#,a	-	-	68156 ^$,b	390208 ^$,b	59443 ^@,b	257598 ^$,b
4-methylsulfanylbutanenitrile	1785	1733 [16]	482607 ^#,b	658725 *^,b	-	390468 ^#,b	540572 ^$,b	979739 ^#,a	459707 ^#,b
5-methylsulfanylpentanenitrile	1948	1891 [15]	664729 *^,c	-	-	814106 ^$,b	1155252 ^$,b	2520488 ^#,a	893718 ^#,bc
1-isothiocyanato-3-methylsulfanylpropane	1976	1983 [17]	6175537 ^#,a	-	-	24958 ^@,b	5770687 *^,a	-	6790716 ^#,a
1-isothiocyanato-4-methylsulfanylbutane	2167	2135 [16]	4351726 *^,a	-	-	-	4149057 ^#,a	-	4135976 ^#,a
glucotropaeolin potassium salt
4-methylsulfanylbutanenitrile	1785	1733 [16]	414374 ^#^,d	588352 *^,bc	-	376014 ^#,d	561198 ^$,b	936512 *^,a	470188 ^#,cd
2-phenylacetonitrile	1931	1912 [18]	-	1699090 *^,b	-	114952 ^#,c	124882 *^,c	3746581 ^#,a	-
5-methylsulfanylpentanenitrile	1948	1891 [15]	687165 ^#,b	-	-	814106 ^$,b	888626 *^,b	2335283 *^,a	679047 ^$,b
1-isothiocyanato-3-methylsulfanylpropane	1976	1983 [17]	6697967 ^#,ab	-	-	-	5169479 *^,b	26058 *^,c	7497730 ^$,a
1-isothiocyanato-4-methylsulfanylbutane	2167	2135 [16]	4277184 ^#,a	-	-	-	3682303 *^,a	-	3509385 ^$,a

¹: saturated solution of calcium chloride; ²: anhydrous sodium sulfate; RRI_exp: relative retention index calculated by n-alkane series using the experimental value (Supelcowax-10 column); RRI_lit: relative retention index calculated by n-alkane series using the literature value; relative standard deviation: *: RSD ≤ 10%, ^#: 10% < RSD ≤ 25%, ^$: 25% < RSD ≤ 50%, ^@: RSD > 50%; values express the mean peak area; ^{a, ab, b, bc, c, cd, d}: the result of statistical analysis (one-way ANOVA Duncan test as post-hoc), values followed by the same letter in a Duncan grouping are not significantly different (α = 0.05); (n = 3).