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Nanoemulsion based alginate organic coating for shelf life extension of okra

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Title Nanoemulsion based alginate organic coating for shelf life extension of okra
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Creator Gajanan Gundewadi, Shalini Gaur Rudra,⁎, Dhruba Jyoti Sarkar, Dinesh Singh
 
Subject Sapindus Basil Nanoemulsion Antimicrobial Shelf life Okra
 
Description Not Available
Okra holds major share of domestic and export vegetable market, but has a short shelf life owing to desiccation
and fungal spoilage. Alginate coating containing nanoemulsified basil (Ocimum basilicum. L) oil was attempted
for maintaining its postharvest quality and preventing spoilage. O/W nanoemulsion was prepared by using basil
oil with synthetic surfactant and a naturally sourced surfactant: Tween 20 and aqueous extract of Sapindus
mukorossi using ultrasonication respectively. Alginate coatings with basil oil nano-emulsified with Tween 20
(ATNE) and Sapindus extract (ASNE) were compared for their effect on PLW (Physiological loss in weight),
colour, texture and acceptability of okra pods stored at 5 ± 1 °C and 24 ± 2 °C. Coatings were able to retard
loss of moisture, colour and firmness during storage. Compared to 10.05% weight loss in uncoated pods (control),
PLW in ASNE and ATNE was recorded as 7.38% and 8.32% respectively after 4 days of cold storage.
Increase in L* value during storage was 26.39% for control pods compared to 14.98% in coated pods. a* value
and browning index revealed better effectiveness of ASNE coating for colour retention during storage. Developed
formulations were found effective against spoilage fungi Penicillium chrysogenum and Aspergillus flavus. Effective
concentration for 50% inhibition of pathogens was determined using probit analysis. EC50 values were lower for
sapindus emulsified basil oil over Tween 20 based nano-emulsion. In vivo trials on okra inoculated with
Penicillium chrysogenum and Aspergillus flavus yielded promising results. Thus alginate coating with basil oil nanoemulsified
with Sapindus extract can emerge as a promising non-chemical approach towards extending postharvest
quality and shelf life of okra.
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Date 2018-10-12T09:57:56Z
2018-10-12T09:57:56Z
2018-08-01
 
Type Article
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/7779
 
Language English
 
Relation Not Available;
 
Publisher ELSEVIER