Abstract
Experiments were conducted on dry untreated onion shreds (2 mm thickness) or treated with salt (5 % solution) and potassium metabisulphite (0.5 % solution) in convective drier at 50 C ((464) % relative humidity (RH)), 55 C ((354) % RH), 60 C ((284) % RH) and 65 C ((204) % RH), heat pump-assisted convective drier at 35 C ((322) % RH), 40 C ((262) % RH), 45 C ((192) % RH) and 50 C ((152) % RH) and microwave-assisted convective drier at four microwave power levels, i.e. 120, 240, 360 and 480 W. The quality parameters of the dried onion shreds, namely rehydration ratio, colour diff erence, pyruvic and ascorbic acid contents and sensory scores were evaluated. The quality of dehydrated onion shreds was observed to be comparatively be er when treated in heat pump drier at 50 C, followed by that in microwave-assisted convective drier at 240 W and 50 C, and last in convective drier at 60 C. The onion shreds pretreated with potassium metabisulphite retained be er colour of the dried product irrespective of drying methods. Therefore, heat pump drying may be recommended as one of the best drying methods for onion shreds, because it maintains the fi nal product quality, which has practical importance for the food industry.
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Claims 3
Claim · model-written summary
Heat pump drying at 50 C gave the best relative quality of dried onion shreds.
- Taxon
- onion
Allium cepae0 - Treatment
- heat pump drier at 50 Ce0
- Outcome
- quality of dehydrated onion shredse0
- Direction
- comparatively be ere0
- Comparator
- microwave-assisted convective drier at 240 W and 50 Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The quality of dehydrated onion shreds was observed to be comparatively be er when treated in heat pump drier at 50 C, followed by that in microwave-assisted convective drier at 240 W and 50 C, and last in convective drier at 60 C”
Claim · model-written summary
Potassium metabisulphite pretreatment better retained onion colour across drying methods.
- Taxon
- onionAllium cepae0
- Treatment
- potassium metabisulphitee0
- Outcome
- colour of the dried producte0
- Direction
- retained be ere0
- Qualifier
- irrespective of drying methodse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The onion shreds pretreated with potassium metabisulphite retained be er colour of the dried product irrespective of drying methods”
Claim · model-written summary
The authors recommend heat pump drying for onion shreds to maintain final quality.
- Taxon
- onionAllium cepae0
- Outcome
- heat pump drying may be recommendede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat pump drying may be recommended as one of the best drying methods for onion shreds, because it maintains the fi nal product quality”
The same questions in other papers
potassium · quality: postharvest · Allium cepa (onion)Results agree
13 papers in the same direction as this paper
- positive
- positive
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See all 14 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.