Paper · 2019 · Journal of Food Composition and Analysis

Boiling and steaming induced changes in secondary metabolites in three different cultivars of pak choi (Brassica rapa subsp. chinensis)

Xiaomin Chen; Franziska S. Hanschen; Susanne Neugart; et al.

7
claims
14
verbatim quotes
20
citations
2
research areas
✓
Open access · cc-by-nc-nd

Abstract

Pak choi (Brassica rapa subsp. chinensis) is a leafy vegetable that is widely available in Asia and consumed in rising quantities in Europe. Pak choi contains high levels of secondary plant metabolites, such as carotenoids, chlorophylls, glucosinolates, phenolic compounds, and vitamin K, which are beneficial for humans if consumed on a regular basis. The evaluation of the genotype-induced variation of secondary plant metabolites revealed that the cultivar ‘Amur’ contained the highest concentration of secondary plant metabolites. Furthermore, steaming retained more chlorophylls, glucosinolates, phenolic acids and flavonoid compounds than boiling. In contrast, both domestic cooking methods – boiling, and steaming – reduced the formation of glucosinolate breakdown products, especially the undesired epithionitriles and nitriles but less of the health-beneficial isothiocyanates.

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Claims 7

Observationobservedoriginal resultpositivemeasured

Claim · model-written summary

Amur had the highest secondary metabolite concentration among cultivars.

Taxon
Pak choie1
Material
‘Amur’e0
Outcome
concentration of secondary plant metabolitese0
Direction
higheste0

Verbatim

e0

“the cultivar ‘Amur’ contained the highest concentration of secondary plant metabolites”

✓ located verbatim in the source · abstract, characters 447–533 · show in text ↑
e1

“Pak choi (Brassica rapa subsp. chinensis)”

✓ located verbatim in the source · abstract, characters 0–41 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Steaming retained more chlorophylls, glucosinolates, and phenolic acids than boiling.

Taxon
Pak choie1
Treatment
steaminge0
Outcome
chlorophylls, glucosinolates, phenolic acidse0
Direction
retained moree0
Comparator
boilinge0

Verbatim

e0

“steaming retained more chlorophylls, glucosinolates, phenolic acids and flavonoid compounds than boiling”

✓ located verbatim in the source · abstract, characters 548–652 · show in text ↑
e1

“Pak choi (Brassica rapa subsp. chinensis)”

✓ located verbatim in the source · abstract, characters 0–41 · show in text ↑
Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Steaming retained more flavonoid compounds than boiling.

Taxon
Pak choie1
Treatment
steaminge0
Outcome
flavonoid compoundse0
Direction
retained moree0
Comparator
boilinge0

Verbatim

e0

“steaming retained more chlorophylls, glucosinolates, phenolic acids and flavonoid compounds than boiling”

✓ located verbatim in the source · abstract, characters 548–652 · show in text ↑
e1

“Pak choi (Brassica rapa subsp. chinensis)”

✓ located verbatim in the source · abstract, characters 0–41 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Boiling reduced formation of glucosinolate breakdown products, especially epithionitriles and nitriles.

Taxon
Pak choie1
Treatment
boilinge0
Outcome
formation of glucosinolate breakdown products, especially the undesired epithionitriles and nitrilese0
Direction
reducede0

Not reportedComparator

Verbatim

e0

“both domestic cooking methods – boiling, and steaming – reduced the formation of glucosinolate breakdown products, especially the undesired epithionitriles and nitriles but less of the health-beneficial isothiocyanates”

✓ located verbatim in the source · abstract, characters 667–885 · show in text ↑
e1

“Pak choi (Brassica rapa subsp. chinensis)”

✓ located verbatim in the source · abstract, characters 0–41 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Steaming reduced formation of glucosinolate breakdown products, especially epithionitriles and nitriles.

Taxon
Pak choie1
Treatment
steaminge0
Outcome
formation of glucosinolate breakdown products, especially the undesired epithionitriles and nitrilese0
Direction
reducede0

Not reportedComparator

Verbatim

e0

“both domestic cooking methods – boiling, and steaming – reduced the formation of glucosinolate breakdown products, especially the undesired epithionitriles and nitriles but less of the health-beneficial isothiocyanates”

✓ located verbatim in the source · abstract, characters 667–885 · show in text ↑
e1

“Pak choi (Brassica rapa subsp. chinensis)”

✓ located verbatim in the source · abstract, characters 0–41 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Boiling reduced isothiocyanate formation less than other breakdown products.

Taxon
Pak choie1
Treatment
boilinge0
Outcome
health-beneficial isothiocyanatese0
Direction
reducede0
Qualifier
but lesse0

Not reportedComparator

Verbatim

e0

“both domestic cooking methods – boiling, and steaming – reduced the formation of glucosinolate breakdown products, especially the undesired epithionitriles and nitriles but less of the health-beneficial isothiocyanates”

✓ located verbatim in the source · abstract, characters 667–885 · show in text ↑
e1

“Pak choi (Brassica rapa subsp. chinensis)”

✓ located verbatim in the source · abstract, characters 0–41 · show in text ↑
Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Steaming reduced isothiocyanate formation less than other breakdown products.

Taxon
Pak choie1
Treatment
steaminge0
Outcome
health-beneficial isothiocyanatese0
Direction
reducede0
Qualifier
but lesse0

Not reportedComparator

Verbatim

e0

“both domestic cooking methods – boiling, and steaming – reduced the formation of glucosinolate breakdown products, especially the undesired epithionitriles and nitriles but less of the health-beneficial isothiocyanates”

✓ located verbatim in the source · abstract, characters 667–885 · show in text ↑
e1

“Pak choi (Brassica rapa subsp. chinensis)”

✓ located verbatim in the source · abstract, characters 0–41 · show in text ↑

processing · quality: phytochemicals · Brassica rapa (field mustard)Results agree

4 papers: 4 positive, 0 negative or no effect

3 papers in the same direction as this paper

  1. positive
  2. positive
  3. positive
See all 4 papers →

Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.