The present investigation was undertaken to explore the effect of different extraction methods, microencapsulation and storage techniques on different quality parameters of papaya leaf extract. The extraction methods include blanching, microwave-assisted extraction (MAE), ultrasound-assisted extraction (probe and bath sonication and combination of ultrasound and microwave extraction methods. Different biochemical characteristics were analysed, namely TPC, TFC, % RSA, Tchl, carotenoids and TSS contents. The highest values of these parameters were obtained with the combination of ultrasound and microwave methods, followed by the probe sonication, microwave and bath sonication methods. The extract obtained through the best method was taken forward to prepare the feed emulsion for microencapsulation. Microencapsulation of papaya leaf extract with different wall materials (Maltodextrin, gum arabic and gelatin) was carried out by spray-freeze-drying (SFD) and freeze-drying (FD) techniques. in SFD, the effect of different ratios of core and wall material (PL: MD, PL: MD+GA, PL:
MD+GA+Ge), the concentration of wall materials (15%, 20%) and flow rate (15 mL/min, 25 mL/min) were studied on the stability of bioactive compounds, such as TPC, TFC, % RSA and EE. The optimized value of core: wall material, wall material concentration and the flow rate were PL: MD+GA+Ge, 20% and 15 mL/min, respectively. The optimized values of TPC, TFC, %RSA and EE were 121.24 mg GAE/g, 43.47 mg QE/g, 91.11%
and 90.62%, respectively. in FD, different core and wall materials (PL: MD, PL: MD+GA, PL: MD+GA+Ge) and the concentration of wall materials (1:1, 1:1.5) were studied. The optimized conditions for this method were PL:MD+GA+Ge, at wall material proportion of 1:1. The optimized values of TPC, TFC, % RSA and EE were 93.24 mg GAE/g, 32.43 mg QE/g, 88.24% and 85.36%, respectively.Storage stability of microencapsulated powder obtained by SFD and FD methods was studied in three different packaging materials: ALP, amber glass bottles and
LDPE at ambient and refrigerated storage conditions for 12 weeks. Higher retention of bioactive compounds was found in the samples stored in the amber glass, followed by ALP and LDPE. During the refrigerated storage of SFD powder for 0 to 12 weeks, TPC retained in amber glass, ALP and LDPE were 80.39%, 75.35% and 55.18%, respectively. Thus it can be inferred that the microencapsulated papaya leaf extract powders obtained by SFD and FD can be best preserved in amber glass bottles under refrigerated conditions, with the maximum stability of the bioactive compounds.
List of Contributing Students and Chairperson of their Advisory Committee
NoS. Name of the
student Roll
No. Degree MTech/
Ph.D.
Title of the Thesis Chairperson 1 Khushbu
Kumari 10387 Ph.D. Development of a sensor-based system for detection of adulteration in selected dairy product
Dr. Subir Kumar Chakraborty 2 Manish
Debnath 10397 Ph.D. Sustainability of ground water use in
central Punjab under changing climate Dr. Arjamadutta Sarangi
3 Shekh Mukhtar Mansuri
10566 Ph.D. Non-destructive detection of fungal spoilage in maize by reflectance spectroscopy and hyperspectral imaging
Dr. Subir Kumar Chakraborty 4 Priyanka
Sakare 10567 Ph.D. Development of lac dye based intelligent packaging indicators for real- time freshness monitoring of paneer and mushroom
Dr. Saroj Kumar Giri
5 Pramod
Shivaji Shelake 10944 Ph.D. Dynamics of ozone in bulk storage system for onion (Allium cepa L.) And its effect on shelf-life
Dr. Debabandya Mohapatra 6 Anjali
Sudhakar 10946 Ph.D. Development of dielectric property- based adulteration detection system for mustard oil
Dr. Subir Kumar Chakraborty 7 Bhukya
Jithender 10947 Ph.D. Development of hydrodynamic cavitation system for enhancing shelf life of sugarcane (Saccharum officinarum L.) juice
Dr. Debabandya Mohapatra
8 Nishanth M
Stanly 10950 Ph.D Energy studies on power machinery
system for selected farm operations Dr. indra Mani 9 Konga
Upendar 10956 Ph.D. Development of a camera based real
time weedicide applicator Dr. Kamal Nayan Agrawal
10 Vikas Pagare 10958 Ph.D. Studies on machine and seedlings parameters for transplanting of bare root onion seedlings
Dr. M Din
11 Prashant Singh 10960 Ph.D. Decision Support System for irrigation scheduling of rice and wheat in the Sultanpur district, Uttar Pradesh
Dr. Arjamadutta Sarangi
12 Abhinav
Dubey 11166 Ph.D. Development of polypropylene reinforced insecticide incorporated jute bags for safe pulse storage
Dr. indra Mani
13 Puramshetti
Lavanya 11169 Ph.D. Development of microencapsulation technology for papaya (Carica papaya L.) Leaf extract to enhance stability of bioactive compounds
Dr. Saroj Kumar Giri
14 Sawant Sanket
Ramnath 11172 Ph.D. Development of ohmic assisted oil extraction technology for enzymatically hydrolyzed black cumin seed
Dr. P K Sharma
15 Mohit
Kumar 11177 Ph.D Design and development of cumin
harvester for small farmers Dr. P K Sahoo 16 Arudra
Srinivasrao 11184 Ph.D Design and development of precision
swinging lance sprayer Dr. Tapan Kumar Khura
17 Jagjeet Singh 11185 Ph.D. investigations on spray characteristics and recycling of spray liquid for tunnel sprayer
Dr. M Din
18 Sheeja P.S. 11191 Ph.D. Assessment of groundwater vulnerability to seawater intrusion in coastal aquifer of malabar region in Kerala
Dr. D K Singh
19 Atish Sagar 11192 Ph.D. Modeling of water and nutrient movement for greenhouse chrysanthemum
Dr. Murtaza Hasan 20 Jyotirmay
Mohapatra 11365 Ph.D. An investigation into the performance of material coated metering plates for a dc motor operated pneumatic planter
Dr. Prem Shanker Tiwari
21 Gopal
Carpenter 11402 Ph.D Design and development of a canopy volume based variable rate sprayer for mango orchards
Dr. indra Mani
22 Waghaye Abhishek Mitaram
11418 Ph.D. Hydro-meteorological mapping and modelling of hydrological processes for managing surface and groundwater resources
Dr. D K Singh
23 P. Kanthavel 11420 Ph.D. Spatio-temporal multivariate drought
analysis in upper tapti river sub-basin Dr. Chandra Kant Saxena 24 Harerimana
Leonce 11644 Ph.D Studies on design and development of
solar powered multi-crop thresher Dr. indra Mani 25 Juhi Ranjan 21392 M.Tech Studies on prolonged safe storage of
potato (Solanum tuberosum L.) in Pusa farm sun fridge
Dr. Sangeeta Chopra
26 Yashaswani
S N 21393 M.Tech Development of process protocol for
infrared drying of apple slices Dr. Arun Kumar T V
27 Karishma
Kumari 21394 M.Tech Development of sensor-based device for
estimation of crop disease severity Dr. Roaf Ahmad Parray
28 Rohit
Anand 21395 M.Tech Development of sensor-based site- specific sprayer for disease control in vegetable crops
Dr. Roaf Ahmad Parray
29 Shailendra
Toppo 21397 M.Tech Design and development of smart trap
for insect control in agricultural crops Dr. Satish D Lande 30 Uday Kiran M 21398 M.Tech Studies on ergonomic evaluation of
battery-assisted weeder Dr. S.P Singh 31 Pooja Sakthi
Rama S 21399 M.Tech Sensor based irrigation scheduling for enhancing water and nitrogen use efficiency in drip fertigated leafy vegetable
Dr. D K Singh
32 Akshay Kumar 21400 M.Tech Spatiotemporal variation in groundwater development and appropriate management strategies for NCT Delhi
Dr. D K Singh
33 Gauri Umeshrao Bhagole
21401 M.Tech Runoff and soil loss at high rainfall
intensity using mini rainfall simulator Dr. Anil Kumar Mishra 34 Resham
Chawla 21402 M.Tech Study on transpiration efficiency and water use efficiency of wheat under controlled environment
Dr. D K Singh
35 Santosh
Kumar Ray 21403 M.Tech Sensor-based fertigation scheduling for
greenhouse tomato Dr. Murtaza Hasan
36 Abhishel Paul 60061 M.Tech Water footprints of major vegetable
crops in eastern gangetic plains of india Dr. Santosh Sambhaji Mali 37 Goutam
Guruprasad Jena
70001 M.Tech Studies on the effect of deficit irrigation strategies on water use efficiency, yield, and quality of pomegranate (cv.
Bhagwa) in shallow basaltic soil
Dr. Dhananjay Dhondiram Nangare 38 Dharmendra
Kumar 70002 M.Tech Water production functions for stress tolerant rootstocks of eggplant (Solanum melongena L. Z
Dr. G.C. Wakchaure
