Noha 3 Flashcards
Beware of sun exposure in the following cases
.
Solar radiation encompasses electromagnetic spectrum
.
Ozone layer absorb
.
The radiation strike earth is
.
Type of Iv radiation
.
100-290
.
290-320
.
320-400
.
Penetrate deeper layer
.
Limited to superficial skin layer
.
Immediate tanning
.
Skin cancer
.
Delayed tanning
.
High UV energy
.
Harmful to living
.
Removed from atmosphere
.
Germicidal application
.
Type of sunscreen agent
.
PABA
.
Salicylate
.
Cinnamte
.
Benzophenone
.
Anthranilate
.
Dibenzoylmethanes
.
Camphor derivative
.
Maximum absorption at 283
.
Drawback of papa
.
Health benefit of paba
.
Hydroxyl and carboxyl ester group
.
Low Iv absorber
.
9 c atoms attached to carboxlic group
.
Available as 2 isomer
.
High photostability
.
Aromatic ketone
.
Strong molar extinction
.
Excellent safety and emollients
.
Physical sunscreen agents
.
Provide broad spectrum protection against UVA and UVB
.
The only FDA approved physical Uv filters
.
Advantage of zinc oxide
L
30 and 200nm
.
Help wound heel more quickly
.
Oil free and won’t clog pores
.
It is one of the most effct sun protectors
.
Block both short and long UVA and all UVB
.
Advantage of TiO2
.
10-100nm
.
Does not provide protection for long UVA
.
Great choice for causal dilly sun exposure
.
Prevent and minimize sunburn and suntan
;
40-60nm
.
The —— enable perfect alignment and better deflection compared to —-
.
Sensory enhancers
.
Booster or film former
.
Imrpove aesthetic
.
Silicon and powder
.
Rheology modifier
.
Sodium acrylate copolymer
.
Hydrogenated polydecene
.
PPG-1 trideceth-6
.
Vechile of sunscreen
.
Enhance effctivty and ability to remain on skin
.
Wrong vechile act as
.
The solven may modify the sunscreen Bez of its polarity»_space;
.
Effect on UV spectrum
.
Solubilization effects
.
Octinoxate
.
Salicylate
.
Agglomeration of sunscreen may occur
.
Dcrease conc of sunscreen and SPF
.
Sunscreen formulation
.
Criteria for optimization sunscreen formulation
.
The majority of sunscreen are
.
Cream and lotion are similar in
.
Difficult to make water resistant
.
Provide maximum sunscreen efficiency
L
Phase inversion emulsion
.
The emulsion type depend on
,
Examples of phase inversion
.
Ethoxylated surfactant
.
Inversion process are possible via
L
Visually elegant product
.
Characterized by clarity and viscosity
.
Composed of single phase
.
Gel
.
Example of gel
;
Poor vechile and poor film forming ability
.
Leave thin and transparent film which lower the spf
.
Shift the maximum wave length to
.
Hold your breath while using it
L
Cause lung cancer and respiration toxicity
.
Evaluation procedures for sunscreen product
.
The ration of the time of uv exposure to produce detectable erthyme in sunscreen to that time for unprotected skin
.
Transpore and vitroskin
.
Animal model have been used
.
Is cover with light prof adhesive foil
.
Usage of SPF is lower than stated on the label
.
Causes erthema after a large dose
.
Decrease UVA dose to achieve a detectable difference in erythema
.
8-methoxypsoralen
.
Advantage of PPF
.
Limitations of PPF
.
Other assy to determine UVA protection
.
Reflect how effectively the advertise degree of protection is maintained under adverse conditions
.
Is declared as water resistant if it maiantain original SPA for two 20-min
.
If it retain its protective integrity after four 20-min i\
.
FDA regulate sunscreen as
.
In Europe sunscreen are considered …
/
The product category designation PCD are
.
Terms that are no longer permitted
.
290-777
.
40-60
.
