Abstract
SummaryAn economic assessment was made of whether leaf vegetables can absorb almost all of a given amount of an L-ascorbic acid solution applied by soaking the roots for 12 h. The effects of storage temperature on the foliar exogenous ascorbic acid content were also observed. It was found that the given amounts of L-ascorbic acid solution are entirely absorbed by lettuce plants (Lactuca sativa L., cv. Redfire) and are over 90% absorbed by spinach (Spinacio olerácea L., cv. Read) and bunching onion plants (Allium fistulosum L., cv. Hakata Kuronegi). Due to the soaking treatment, the sum of the L-ascorbic acid (AA) and dehydro-ascorbic acid (DHA) contents (mg per 100 g fresh weight) in the leaves of plants which showed no signs of wilting increased from 38.9 to 201–221 in lettuce, from 76.5 to 196–225 in spinach and from 46.7 to 134–144 in bunching onion. The foliar AA content in all the plants stayed at approximately the same value during a storage period of 7 d at 4°C, but decreased significantly at 25°C. The foliar DHA content in all of the plants stayed at approximately the same value during storage at both 4 and 25°C. These results suggest that the ascorbic acid introduced into leaf vegetables can be used effectively by consumers when the vegetables are stored at low temperature.
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Claims 11
Claim · model-written summary
Lettuce entirely absorbed the applied L-ascorbic acid solution.
- Taxon
- lettuce
Lactuca sativae0 - Material
- Redfiree0
- Outcome
- L-ascorbic acid solution are entirely absorbede0
- Direction
- entirely absorbede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the given amounts of L-ascorbic acid solution are entirely absorbed by lettuce plants (Lactuca sativa L., cv. Redfire)”
Claim · model-written summary
Spinach absorbed over 90% of the applied solution.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“are over 90% absorbed by spinach (Spinacio olerácea L., cv. Read)”
Claim · model-written summary
Bunching onion absorbed over 90% of the applied solution.
Verbatim
e0“are over 90% absorbed by spinach (Spinacio olerácea L., cv. Read) and bunching onion plants (Allium fistulosum L., cv. Hakata Kuronegi)”
Claim · model-written summary
Soaking raised leaf AA plus DHA content in lettuce from 38.9 to 201–221 mg per 100 g fresh weight.
- Taxon
- lettuceLactuca sativae0
- Organ / stage
- leavese0
- Treatment
- soaking treatmente0
- Outcome
- sum of the L-ascorbic acid (AA) and dehydro-ascorbic acid (DHA) contentse0
- Direction
- increasede0
- Value
- 201–221e0
- Qualifier
- from 38.9e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Due to the soaking treatment, the sum of the L-ascorbic acid (AA) and dehydro-ascorbic acid (DHA) contents (mg per 100 g fresh weight) in the leaves of plants which showed no signs of wilting increased from 38.9 to 201–221 in lettuce”
Claim · model-written summary
Soaking raised leaf AA plus DHA in spinach from 76.5 to 196–225 mg per 100 g fresh weight.
- Taxon
- spinach
Spinacia oleraceae0 - Organ / stage
- leavese0
- Treatment
- soaking treatmente0
- Outcome
- sum of the L-ascorbic acid (AA) and dehydro-ascorbic acid (DHA) contentse0
- Direction
- increasede0
- Value
- 196–225e0
- Qualifier
- from 76.5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Due to the soaking treatment, the sum of the L-ascorbic acid (AA) and dehydro-ascorbic acid (DHA) contents (mg per 100 g fresh weight) in the leaves of plants which showed no signs of wilting increased from 38.9 to 201–221 in lettuce, from 76.5 to 196–225 in spinach”
Claim · model-written summary
Soaking raised leaf AA plus DHA in bunching onion from 46.7 to 134–144 mg per 100 g fresh weight.
- Taxon
- bunching onione0
- Organ / stage
- leavese0
- Treatment
- soaking treatmente0
- Outcome
- sum of the L-ascorbic acid (AA) and dehydro-ascorbic acid (DHA) contentse0
- Direction
- increasede0
- Value
- 134–144e0
- Qualifier
- from 46.7e0
Not reportedComparator
Verbatim
e0“Due to the soaking treatment, the sum of the L-ascorbic acid (AA) and dehydro-ascorbic acid (DHA) contents (mg per 100 g fresh weight) in the leaves of plants which showed no signs of wilting increased from 38.9 to 201–221 in lettuce, from 76.5 to 196–225 in spinach and from 46.7 to 134–144 in bunching onion.”
Claim · model-written summary
Foliar AA stayed approximately stable for all three vegetables after seven days at 4°C.
Verbatim
e0“The foliar AA content in all the plants stayed at approximately the same value during a storage period of 7 d at 4°C”
t0“vegetables”
Claim · model-written summary
Foliar AA decreased significantly during storage at 25°C.
Verbatim
e0“The foliar AA content in all the plants stayed at approximately the same value during a storage period of 7 d at 4°C, but decreased significantly at 25°C.”
t0“vegetables”
Claim · model-written summary
Foliar DHA remained approximately stable during storage at 4°C.
Verbatim
e0“The foliar DHA content in all of the plants stayed at approximately the same value during storage at both 4 and 25°C.”
t0“vegetables”
Claim · model-written summary
Foliar DHA remained approximately stable during storage at 25°C.
Verbatim
e0“The foliar DHA content in all of the plants stayed at approximately the same value during storage at both 4 and 25°C.”
t0“vegetables”
Claim · model-written summary
The authors recommend low-temperature storage for effective consumer use of introduced ascorbic acid.
Verbatim
e0“the ascorbic acid introduced into leaf vegetables can be used effectively by consumers when the vegetables are stored at low temperature.”
The same questions in other papers
application · molecular: metabolites · Lactuca sativa (garden lettuce)Positive and negative results
12 papers in the same direction as this paper · 4 in the opposite direction
- negative
- no effect
- negative
13 papers more in this group
See all 17 papers →application · molecular: metabolites · Spinacia oleracea (spinach)Positive and negative results
13 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- no effect
13 papers more in this group
See all 17 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.