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Flashcards in Food nanotechnology Deck (28):
1

nanostructures

prot = globular
nano = 10-100 nm
foam and emulsion = nano
starch = nano crystal
casein = 100 nm in milk

2

properties of nano

high mobility
new optical properties
molecular recognition in DNA, hormonal system...
super magnetism
superconductivity
largely increased reactivity
very attractive or repulsive surface charge

3

how to observe nano

zetasizer
masterizer
scanning electron microscopy SEM
atomic force macroscopy AFM
transmission electron microscopy

4

health and nutrition

nano capsulation = flavor and nutrient control
engineered nanoparticle additive = nano sized ingredients and additives

5

novel material

antibacterial packaging
controlled gas permeability

6

food safety

self evident shelf life labels
small environment sensors

7

nano encapsulation

coating and entrapment of pure material
usually liquid
increase stability = heat, pH, oxidation
stable color and taste
mild on stomach
sustained release + high absorption

8

nano encapsulation of

Nutralease = Coenzyme Q10 (can be decreased by fibers)
lutein
lycopene
phytosterol
vit D

9

examples of nano encapsulation

tiptop up omega 3 bread = encapsulation of tuna fish oil
canola active oil = encapsulation of fortified phytosterol which reduce cholesterol intake by 14%

10

advantage of physical cross linked nanoparticles

no chemical reagents
mild aqueous conditions
simple procedures
suitable for bioactive agents

11

lycopene nano addition benefits

improve texture, flavor , taste
reduce amount of salt, fat, sugar
enhance bioavailability

12

mineral supplement = nano tea

enhance bioavailability of nutrients
antimicrobial
nano iron drink
nano chicken feed (nan selenium stop bird flu alternative to chemical antibiotics)

13

nano powdered catalytic device

coated with 20 nm zeolite nano
better taste, crisper
better consistency
lower cost

14

nano for food coloring

gentle
doesn't allow phase change or a lot of heating
produce fresher flavor
cheaper

15

nano in films

inorganic = silver, TiO2, nanoclay
changes functionality = antibacterial and improves O2 and moisture barrier

16

nano beer bottles

lighter
stronger
decrease loss of CO2

17

smart dust

monitor humidity, T
detect spoil/freshness
monitor soil condition and crop growth
measure activity of selected susbtance
CO2 sensors
acoustic sensors
odour sensors
pressure sensors
temperature sensors
humidity and dust sensors
quality control for beverages by nano electronic tongue

18

shelf life lables

for T, fresh, patio, integrity, RH

19

CO2 indicator

form microbial respiration, fermentation
color change

20

poultry freshness indicator

mletmyoglobin normally brown reacts with H2S that is produced by bacteria to produce sulfmyoglobin which has a green color
so color change form brown to green which indicates decrease in freshness

21

ripeness indicator

as hipness increase volatiles cause change from red to yellow

22

freshness indicator

toxin guard = reaction between antibodies and toxins
-detector (antibodies) against specific toxin in polymer
-detector binds to toxin A
-antibody toxin complex in detector binds to capture area B
-binding cause label to change color or fluorescence
can also be sued to detect metabolites

23

temperature indicator

thermo chromic dye in plastic
brown --> red = heat + lead correctly attach
universal code
heat = wax melt = mix with dye = irreversible

24

trends in public opinion

high expectation
concern moderate
knowledge very low

25

nano silver

germ killin properties
can harm aquatic organisms

26

carbon fullerenes

C60 in face antiaging creams
cause brain damage in fish kills water fleas
low levels have been found to be toxic to human liver cells

27

nano sunscreen

titanium oxide, zinc oxide = photoactive = free radicals causing DNA damage to human skin cells when exposed to UV light

28

consumer safety concern

solubilized and digested in gut
greater bioavailability doesn't not lead to increased health risk
tissue distribution not different from conventional forms
toxicological propertjes not yet known
clear advantages the benefits outweigh risk
case by case assessment for regulations