Residual nitrite and biogenic amines of traditional northeast sauerkraut in China

Figures & data

Table 1. The content of nitrite in northeast sauerkrauts from three different sources.

Different source of samples		Number (n)	Nitrite content (mg/kg)
			≤20	>20	Mean ± SD	Min	Max
Local supermarkets	packaged	118	113	5	17.2 ± 2.1^a	5.8	32.4
Chinese families	unpackdged	130	95	35	38.5 ± 5.2^b	10.8	80.1
Morning markets	packaged	63	55	8	18.2 ± 2.2	6.2	78.4
	unpackaged	67	51	16	33.2 ± 5.6	5.6	88.1
	Total*	130	106	24	25.6 ± 3.4^c	5.6	88.1

*, the total content of nitrite of samples from morning markets, including packaged and unpackaged sauerkrauts.

a–c, lowercase letters indicate a significant difference among samples in the three sources (P < 0.05).

Table 2. The content of biogenic amines in northeast sauerkrauts from three different sources.

			Biogenic amine content (mg/kg)
Different source of samples		Number (n)	his	tym	trpm	put	cad
Local supermarkets	packaged	118	25.0 ± 2.1^a	91.6 ± 2.7^a	12.5 ± 2.1^a	98.3 ± 2.9^a	41.1 ± 3.5^a
Chinese families	unpackdged	130	29.1 ± 2.5^b	203.7 ± 2.6^b	28.1 ± 3.5^b	128.3 ± 2.3^b	67.6 ± 2.3^b
Morning markets	packaged	63	26.1 ± 2.7	99.9 ± 2.0	16.3 ± 2.1	100.6 ± 3.5	45.9 ± 3.9
	unpackaged	67	32.6 ± 2.9	107.9 ± 2.3	27.3 ± 3.8	159.6 ± 2.8	76.9 ± 2.6
	Total	130	29.4 ± 2.8^b	103.9 ± 2.2^c	21.8 ± 2.9^c	130.1 ± 3.2^b	61.4 ± 3.3^b

a–c, lowercase letters indicate a significant difference among samples in the three sources (P < 0.05).

Figure 1. The average nitrite contents of packaged and unpackaged sauerkraut from the northeast region of China.

Figure 2. The total BA contents of packaged and unpackaged sauerkraut from the northeast region of China.