Abstract
Strawberries have a very short post-harvest life mostly due to their relatively high water content, intense metabolic activity and susceptibility to microbial rot. Antimicrobial low-density polyethylene nanocomposite films containing ZnO nanoparticles at different mass fractions were prepared by melt mixing and followed by compression moulding using a hot press machine. Fresh strawberries were packed in nanocomposite films and stored at 4 °C. Their microbial stability, ascorbic acid content and titratable acidity were evaluated after 0, 4, 8, 12 and 16 days of storage. Microbial growth rate was significantly reduced up to 16 days as a result of the use of nanocomposite packaging material containing ZnO nanoparticles. By increasing the ZnO nanoparticle mass fraction to 5%, the antimicrobial activity of the film increased. All packages containing the ZnO nanoparticles kept the microbial load of fresh strawberries below the level that affects shelf life (5 log CFU/g) up to 16 days. The lowest degradation of ascorbic acid content (6.55 mg per 100 g), and loss of acidity (0.68%) were observed in packages containing 3% of ZnO nanoparticles with 10% polyethylene-grafted maleic anhydride.
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Claims 5
Claim · model-written summary
ZnO nanocomposite packaging reduced microbial growth in stored strawberries through day 16.
- Taxon
- Strawberries
_single2.jpg?width=60)
Fragaria ×ananassat0 - Treatment
- nanocomposite packaging material containing ZnO nanoparticlese0
- Outcome
- Microbial growth ratee0
- Direction
- reducede0
- Qualifier
- up to 16 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“Microbial growth rate was significantly reduced up to 16 days as a result of the use of nanocomposite packaging material containing ZnO nanoparticles.”
t0“Fresh Strawberries”
Claim · model-written summary
Increasing ZnO nanoparticle fraction to 5% increased film antimicrobial activity.
- Taxon
- StrawberriesFragaria ×ananassat0
- Treatment
- ZnO nanoparticle mass fraction to 5%e0
- Outcome
- antimicrobial activity of the filme0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By increasing the ZnO nanoparticle mass fraction to 5%, the antimicrobial activity of the film increased.”
t0“Fresh Strawberries”
Claim · model-written summary
All ZnO packages kept strawberry microbial load below the shelf-life threshold through day 16.
- Taxon
- strawberriesFragaria ×ananassae0
- Treatment
- packages containing the ZnO nanoparticlese0
- Outcome
- microbial load of fresh strawberriese0
- Direction
- belowe0
- Value
- 5 log CFU/ge0
- Qualifier
- up to 16 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All packages containing the ZnO nanoparticles kept the microbial load of fresh strawberries below the level that affects shelf life (5 log CFU/g) up to 16 days.”
Claim · model-written summary
The 3% ZnO plus 10% grafted anhydride package had the lowest ascorbic acid degradation.
- Taxon
- StrawberriesFragaria ×ananassat0
- Treatment
- packages containing 3% of ZnO nanoparticles with 10% polyethylene-grafted maleic anhydridee0
- Outcome
- degradation of ascorbic acid contente0
- Direction
- loweste0
- Value
- 6.55 mg per 100 ge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest degradation of ascorbic acid content (6.55 mg per 100 g), and loss of acidity (0.68%) were observed in packages containing 3% of ZnO nanoparticles with 10% polyethylene-grafted maleic anhydride.”
t0“Fresh Strawberries”
Claim · model-written summary
The 3% ZnO plus 10% grafted anhydride package had the lowest acidity loss.
- Taxon
- StrawberriesFragaria ×ananassat0
- Treatment
- packages containing 3% of ZnO nanoparticles with 10% polyethylene-grafted maleic anhydridee0
- Outcome
- loss of aciditye0
- Direction
- loweste0
- Value
- 0.68%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest degradation of ascorbic acid content (6.55 mg per 100 g), and loss of acidity (0.68%) were observed in packages containing 3% of ZnO nanoparticles with 10% polyethylene-grafted maleic anhydride.”
t0“Fresh Strawberries”
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See all 8 papers →8 of 11 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
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.