Abstract
The bioactivity of onion, particularly its oil, has gained increasing research attention. Preparation of onion oil is challenging due to its low oil content and abundance of water. In this study, pilot-scale drying combined with laboratory extraction was conducted for sample preparation. GC/MS and solid phase microextraction (SPME) analyses were performed to evaluate the correlation between onion oil and drying. Results showed that drying significantly influenced the sulfocompounds composition of onion oils. Dipropyl disulfide and dispropyl trisulfide were the most abundant compounds in fresh onions (accounting for 68.41% to 93.13% of the total volatile sulfocompounds). The total contents of sulfocompounds in vacuum freeze dried and hot air dried onion powder were 4.96% and 39.79%, respectively, which account for 24.59% to 48.89% of the total content. Dimethyl sulfides and thiophenes were the main compounds in the onion oils. The highest content of sulfocompounds was obtained in the oil of hot air dried powder. Pilot-scale hot air drying was the optimal pretreatment method for onion oil extraction. It enjoys lower energy lost, shorter process time, and higher quality of the oil compared with freeze drying. The results may be helpful for onion oil production and bioactivity evaluation.
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Claims 9
Claim · model-written summary
Drying significantly influenced the sulfocompound composition of onion oils.
- Taxon
- onions
Allium cepat0 - Treatment
- dryinge1
- Outcome
- sulfocompounds compositione1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fresh onions”
e1“drying significantly influenced the sulfocompounds composition of onion oils”
Claim · model-written summary
Dipropyl disulfide and dispropyl trisulfide were the most abundant volatile sulfocompounds in fresh onions, accounting for 68.41% to 93.13% of the total.
Verbatim
t0“fresh onions”
e2“Dipropyl disulfide and dispropyl trisulfide were the most abundant compounds in fresh onions (accounting for 68.41% to 93.13% of the total volatile sulfocompounds)”
Claim · model-written summary
Vacuum freeze dried onion powder had a total sulfocompound content of 4.96%.
- Taxon
- onionsAllium cepat0
- Treatment
- vacuum freeze driede3
- Outcome
- total contents of sulfocompoundse3
- Value
- 4.96%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fresh onions”
e3“The total contents of sulfocompounds in vacuum freeze dried and hot air dried onion powder were 4.96% and 39.79%, respectively”
Claim · model-written summary
Hot air dried onion powder had a total sulfocompound content of 39.79%.
- Taxon
- onionsAllium cepat0
- Treatment
- hot air driede3
- Outcome
- total contents of sulfocompoundse3
- Value
- 39.79%e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fresh onions”
e3“The total contents of sulfocompounds in vacuum freeze dried and hot air dried onion powder were 4.96% and 39.79%, respectively”
Claim · model-written summary
The highest sulfocompound content in onion oil was obtained from hot air dried powder.
- Taxon
- onionsAllium cepat0
- Treatment
- hot air driede4
- Outcome
- highest content of sulfocompoundse4
- Direction
- higheste4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fresh onions”
e4“The highest content of sulfocompounds was obtained in the oil of hot air dried powder”
Claim · model-written summary
Hot air dried onion oil had higher quality than oil from freeze drying.
- Taxon
- onionsAllium cepat0
- Treatment
- Pilot-scale hot air dryinge5
- Outcome
- quality of the oile6
- Direction
- highere6
- Comparator
- freeze dryinge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fresh onions”
e5“Pilot-scale hot air drying was the optimal pretreatment method for onion oil extraction”
e6“It enjoys lower energy lost, shorter process time, and higher quality of the oil compared with freeze drying”
Claim · model-written summary
Hot air drying had lower energy loss and shorter process time than freeze drying.
- Taxon
- onionsAllium cepat0
- Treatment
- Pilot-scale hot air dryinge5
- Outcome
- energy lost, shorter process timee6
- Direction
- lowere6
- Comparator
- freeze dryinge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fresh onions”
e5“Pilot-scale hot air drying was the optimal pretreatment method for onion oil extraction”
e6“It enjoys lower energy lost, shorter process time, and higher quality of the oil compared with freeze drying”
Claim · model-written summary
Pilot-scale hot air drying is the optimal pretreatment method for onion oil extraction.
- Taxon
- onionAllium cepae5
- Outcome
- optimal pretreatment method for onion oil extractione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Pilot-scale hot air drying was the optimal pretreatment method for onion oil extraction”
Claim · model-written summary
Dimethyl sulfides and thiophenes were the main compounds in onion oils.
- Taxon
- onionsAllium cepat0
- Outcome
- Dimethyl sulfides and thiophenese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“fresh onions”
e7“Dimethyl sulfides and thiophenes were the main compounds in the onion oils”
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See all 10 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.