The seminar that I have shared is Nano coating, nano treatments novel approaches for extending the post harvest life of horticulture produce. An idea how shelf of the fresh produce can be extended.

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120 gm
280 gm120 gm
46 gm

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6. Nano-coating , Nano-treatments
novel approaches to
Extend the post harvest life
of Horticultural produce
Aisha Kolhar
UHS15PGM620
Dept of Post Harvest Tech
Seminar I
on

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Properties of Nano Particles
Case Studies
Conclusion
Mechanism of Nano Particles
History of nanotechnology
Introduction to nanotechnology

8. Nanotechnology ?...
“Nanotechnology is the art and
science of manipulating matter at
nanoscale”
The design, characterization, production and
application of structure, device and system by
controlling shape and size at nanoscale
British standard institution, 2005
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9. ‘Nano’- Greek word means ‘Dwarf’
 1 nm = one billionth (10ˉ⁹) of metre
 Size range between 0.1 and 100 nm
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11. “There’s Plenty of Room at the Bottom”
- at American Physical Society meeting at the California
Institute of Technology on Dec-29, 1959.
“Adaptability to manipulate, control, assemble, produce
and manufacture things at atomic precision” 11
Father of nano technology
Nobel Laureate-1965
Richard Feynman, Physicist

12. Norio Taniguchi,
Professor - coined the term
“Nanotechnology” (1974)
“Nano-technology’’ - Processing, separation, consolidation and
deformation of materials by one atom or by one molecule.
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13. ~ 2000 Years
Ago
Sulfide nanocrystals used by Greeks and Romans to dye hairs
~ 1000 Years
Ago
Gold nanoparticles of different sizes used to produce different colors in
stained glass windows
1959 “There is plenty of room at the bottom” by R. Feynman
1974 Taniguchi uses the term nanotechnology for the first time
1981 IBM develops Scanning Tunneling Microscope
1985 “Buckyball” - Scientists at Rice University and University of Sussex discover
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1986 • “Engines of Creation” - First book on nanotechnology by K. Eric Drexler.
• Atomic Force Microscope invented by Binnig, Quate and Gerbe
1989 IBM logo made with individual atoms
1991 Carbon nanotube discovered by S. Iijima
1999 “Nanomedicine” – 1st nanomedicine book by R. Freitas
2000 “National Nanotechnology Initiative” launched
(British Standards Institution, 2005)
Time Line of Nanotechnology
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15. Properties of nano particles
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 Nano-scale materials show unusual physical, chemical and biological
properties. (Li et al., 2001)
 Nanoparticles have large surface to volume ratio (Kumar et al., 2010)
Magical changes takes place at Nano level
Physical Surface area, conductivity, charge capacity
Chemical Reactivity
Mechanical strength

16. Things behave differently in nano-world
 Carbon in the form of graphite (i.e. pencil lead)
is soft, at the nano-scale, can be stronger than
steel and is six times lighter
 Nano-scale copper is a highly elastic
metal at room temperature, stretching
to 50 times its original length without breaking
 Shiny orange yellow Gold changes its colour to
brownish black on reducing the size
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17. (Royal Society and Royal Academy of Engineering, 2004)
METHODS OF NANOPARTICLE PRODUCTION
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18. (Royal Society and Royal Academy of Engineering, 2004)
TOP DOWN APPROACH
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19. (Royal Society and Royal Academy of Engineering, 2004)
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BOTTOM UPAPPORAOCH

20. Dendrimers
Quantumdots
Nanosensors
FullerenesCarbon Nanotubes
Nano Chips
C60 Cadmium selinade
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Tools of Nanotechnology

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Why we need Nanotechnology ???
To enhance the efficiency of available post harvest technologies
To reduce the economics of additives.
Ethylene biosynthesis inhibitors – AVG,AOA : Expensive and
Phytotoxic
Many chemicals which we are using may be soon banned due to
their environmental impact

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Case study 1

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Fig.1 Changes in vase water uptake over time of cut gerbera cv. Ruikou
flowers following NS pulse treatments

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Fig.2 Changes in relative fresh weight (B) over time of cut gerbera cv. Ruikou
flowers following NS pulse treatments

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Fig. 3 Changes over time for control (CK) and 5mg NS/L pulse treatments
in numbers of vase solution and stem-end bacteria for cut gerbera cv.
Ruikou flowers (n = 3).

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Case study 2

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Fig. 4 Effects of chitosan or/and nano-silica treatments on fruit browning index (a) in
loquat fruit

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Fig. 5 Effects of chitosan or/and nano-silica treatments on fruit weight loss in
loquat fruit

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Fig.6 Effects of chitosan or/and nano-silica treatments on contents of TSS in
loquat fruit

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Fig. 7 Effects of chitosan or/and nano-silica treatments on contents of TA in
loquat fruit

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Fig. 8 Effects of chitosan or/and nano-silica treatments on activities of PAL in
loquat fruit

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Figure
Fig. 9 Effects of chitosan or/and nano-silica treatments on activities of
PPO enzyme in loquat fruit

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Case study 3

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Table 2 Composition, mean droplet diameter (Z-average) and
polydispersity index (PDI) of different nanoemulsions produced
for the encapsulation of essential

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Fig. 12 Total microbial load of rucola samples

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Fig. 13 Total microbial load of rucola samples treated with a bioactive
coating, consisting of nanoemulsified lemon EO with modified chitosan, in
comparison with the untreated samples(control) as function of the storage
time.
Time (Days)

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Table 3 Evolution of global colour difference
ΔE*ab and of peak force in compression (N)
over time of rucola
samples

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Case study 4

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Fig. 15 Total soluble solids (TSS) of mangoes during 45 d of storage. Each
data point is the average of three determinations and the error bars show
the standard deviation.
17.63 ± 0.4 Brix
11.5 ± 0.3 B
15.8 ± 0.3 Brix
11.5 ± 0.05 B
13.3 ± 0.1 Brix

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Fig 16 Mass loss of mangoes during 45 d of storage. Each data point is the
average of three determinations and the error bars show the standard
deviation
3.26 ± 0.25%
1.8±0.16%

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Fig. 17 Titratable acidity (TA) of mangoes during 45 d of storage. Each data
point is the average of three determinations and the error bars show the standard
deviation.
0.77 ± 0.3 (%)
0.80 ± 0.01 (%)
0.12 ± 0.01 (%)
0.40 ± 0.01 (%),

46. Health issues
Nanoparticles could be inhaled, swallowed, absorbed
through skin
they trigger inflammation and weaken the immune system.
And interfere with regulatory mechanisms of enzymes
and proteins
Environmental issues
Nanoparticles could accumulate in soil, water and plants
New risk assessment methods are needed
National and international agencies are beginning to
study the risk
 Results will lead to new regulations
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Potential Risks of Nanotechnology

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The efficiency and the economic benefits of applying various
techniques in combination with nanotechnology needs to be
evaluated in the different Horticultural produce.
Focused research is required in use of nanoparticles to improve
the quality and the post harvest life of Horticultural produce.
Future prospects

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Nano