Optimization of drying techniques for extraction of bioactive compounds from guava (Psidium guajava L.) leaves.

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dc.contributor.advisorMahesh Kumar
dc.contributor.authorIshwinder Kaur
dc.date.accessioned2022-02-09T05:04:57Z
dc.date.available2022-02-09T05:04:57Z
dc.date.issued2021
dc.description.abstractGuava is known to have high nutritive value. Several health benefits of guava leaves have also been reported. However, the information on drying, modelling parameters and effect of drying on bioactive compounds is limited. The leaves of guava varieties Shweta and Purple Guava were dried using shade drying, tray drying (50°C, 60°C and 70°C) and microwave drying (360 W, 540 W and 720 W) approaches. To explain the drying data 19 models were evaluated. The drying data was best explained by Page model and Verma model in shade drying; Midilli and Kuck model, Jena and Das model at 70˚C tray drying; Midilli and Kuck and Logarthmic model for 360 W microwave drying in Purple Guava and Shweta, respectively. In both the guava varieties L*, a*, b* values were higher in fresh leaves in comparison to shade, tray drying and microwave drying methods. In Purple Guava, the rehydration capacity was highest (1.89) at 500C in tray drying, while in Shweta, it was highest (1.75) at 720 W in microwave drying. The total phenol content in fresh Purple Guava leaves was highest i.e 580.18 mg GAE/ mg dry weight among all drying conditions, while in Shweta the highest phenol content i.e 646.81 GAE/ mg dry weight was attained by 600 tray drying. In case of Purple Guava leaves powder, the highest (208.62 mg QE/ mg dry weight) flavonoid content was noted for 500C tray drying. The total flavonoid content decreased during the storage period irrespective of the guava variety.en_US
dc.identifier.citationIshwinder Kaur (2021). Optimization of drying techniques for extraction of bioactive compounds from guava (Psidium guajava L.) leaves. (Unpublished M.Tech. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810181896
dc.keywordsGuava leaves -Shweta and purple guava, drying techniques, mathematical modeling, phenol, flavonoidsen_US
dc.language.isoEnglishen_US
dc.pages66en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemOptimization of drying techniques for extraction of bioactive compounds from guava (Psidium guajava L.) leaves.en_US
dc.subProcessing and Food Engineeringen_US
dc.themeOptimization of drying techniques for extraction of bioactive compounds from guava (Psidium guajava L.) leaves.en_US
dc.these.typeM.Tech.en_US
dc.titleOptimization of drying techniques for extraction of bioactive compounds from guava (Psidium guajava L.) leaves.en_US
dc.typeThesisen_US
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