Antiperspirants and
Deodorants
Instructor:
Ms. Yassen Qawasmi
Prepared by :
Wala’ Abu-3isheh
Bayyan Dwayyat
Definition sweating
• Perspiration (sweating, transpiration, or diaphoresis) is the production
of fluids secreted by the sweat glands in the skin of mammals.
• In humans, sweating is primarily a means of thermoregulation which is
achieved by the water-rich secretion of the eccrine glands. Maximum
sweat rates of an adult can be up to 2-4 liters per hour or 10-14 liters per
day (10-15 g/min•m²), but is less in children prior to puberty.[2][3][4]
Evaporation of sweat from the skin surface has a cooling effect due to
evaporative cooling. Hence, in hot weather, or when the individual's
muscles heat up due to exertion, more sweat is produced.
The causes of perspiration & body odour
The skin contains a number of different glands which secrete liquids, –
commonly called sweat or perspiration, onto the skin surface through pores.
One of the glands, the Eccrine gland, is found over almost the entire body
and its secretion is mainly water with dissolved salts (eg, sodium chloride)
and other organic materials. These glands are active from birth and when we
get hot, excited or nervous they release their secretion onto the skin where it
evaporates. Because the armpit is a partially enclosed area of the body
perspiration can build up leading to a 'sweaty' underarm feeling and wet
marks on clothing. Another relevant gland is the Apocrine gland, mainly
found in the armpit and genital areas of the body. These glands are only
active from puberty and release small amounts of a complex secretion when
we are under stress or excited. Hence the armpit is a moist environment fed
with secretions from the glands. This makes it particularly suitable for the
bacteria naturally present on the skin to grow. When sweat is released it
doesn't have an odour but bacteria break down materials in the sweat
body odour smell or BO which most people find unpleasant.resulting in the
Sweat glands
1. An apocrine sweat gland •
is a sweat gland composed of a coiled secretory portion located at the junction
of the dermis and subcutaneous fat, from which a straight portion inserts
and secretes into the infundibular portion of the hair follicle. In humans,
apocrine sweat glands are found only in certain locations of the body: the
axillae (armpits), areola and nipples of the breast, ear canal, eyelids, wings
of the nostril, perianal region, and some parts of the external genitalia.
Modified apocrine glands include the ciliary glands in the eyelids; the
ceruminous glands, which produce ear wax; and the mammary glands,
which produce milk. The rest of the body is covered by eccrine sweat
glands.
2. Eccrine glands sometimes called merocrine glands) •
are the major sweat glands of the human body, found in
virtually all skin. They produce a clear, odorless substance,
consisting primarily of water and NaCl. NaCl is reabsorbed
in the duct to reduce salt loss. They are active in
thermoregulation and emotional sweating (induced by
anxiety, fear, stress, and pain). The white sediment in
otherwise colorless eccrine secretions is caused by
evaporation that increases the concentration of salts
components of sweat
Ethnicity: hypotonic liquid form of blood plasma. Acidic •
substance which is the degree of acidity is between 4 and 6.
It consists mainly of 99% water and some mineral salts,
which are sodium chloride, potassium, and bicarbonate. It
also contains inorganic compounds such as lactic acid, urea,
and ammonia. Agaytamen and c, and medicine. Secreted by
sweat glands
Sweating mechanism
Produce sweat in humans through the sweat glands that have a
role in regulating body temperature , through cooling by
evaporating sweat on the skin surface and numbering in the skin
2-4 million almost a secrete sweat under the influence of the
nervous system future friendly by the neurotransmitter Asetayl
Colin kept under hypothalamus - a part of the brain has its center
of regulating body temperature - at body temperature constant
and receives this segment signals pulsed blood warm and
receptors of heat in the body and then sends signals through the
nerves to the sweat glands , which in turn produces sweat as
works of nervous tension the excitement also urged the sweat
glands , especially those in the hands and armpits .
The difference between a deodorant &
an anti-perspirant
• Deodorant products counteract the formation of unpleasant body odour.
They principally work by controlling the growth of bacteria on the skin
surface but also contain perfume which can help overcome body odour
and give a pleasing fragrance. These products do not affect sweating.
Examples are LYNX Body Spray and IMPULSE fragrances which give quality
fragrances with the reassurance of an effective deodorant.
• Anti-perspirant products reduce the amount of sweat released to keep the
armpit dry and comfortable. The action of the anti-perspirant ingredients
also helps to control the growth of bacteria. This, together with the effect
of the perfume, means that they work as effective deodorants. Hence,
anti-perspirants are usually labelled as anti-perspirant deodorants as they
perform both functions. Example products are the REXONA and DOVE
brand products, which give highly efficient protection from wetness and
odour
What ingredients are in antiperspirants and
deodorants?
1. Alcohol
antiperspirants and deodorants
are often dissolved in alcohol because it dries quickly once applied to the skin and
gives an immediate sense of coolness.
2. Aluminium salts
Aluminium salts are the active ingredient in antiperspirants. They work to reduce the
flow of sweat from the sweat gland to the skin surface.
3. Antimicrobials
The skin is home to natural bacteria that like to feed on sweat but as a
result, produce bad smells. In occluded areas, such as the underarm,
there are about 1 million bacteria per square centimetre. By lowering
the number of bacteria on the skin, body odour can also be reduced.
Antimicrobials agents kill bacteria and also slow their growth so that
stay you odour-free for longer
4. Fragrance and skin conditioners
Perfumes and fragrances are used in most deodorants and antiperspirants
in order to mask body odour and provide a feeling of freshness to the
user. Virtually all antiperspirant and deodorant products contain some
emollient oils to soothe and soften the skin..
5. Carrier substances •
In order for antiperspirants to be effectively applied to the skin, they need to be held
in some kind of carrying structure - whether that be the liquids used in aerosols
or the solids used in sticks. Water is used in a range of antiperspirants as a carrier
for other ingredients as it adds fluidity to roll-ons and creams and helps the
product spread onto the skin. In aerosol products the active ingredients are held
in a neutral liquid which enables them to be easily sprayed onto the skin. This
liquid (commonly cyclomethicone) is often combined with a slightly denser
mineral clay-like substance (disteardimonium hectorite) which provides structure
to the antiperspirant and stops heavier ingredients sinking to the bottom.
Likewise, solid antiperspirant and deodorant products contain an agent which
provides structure and prevents the ingredients from separating out. This
structure can be provided by a combination of ingredients including
hydrogenated castor oil, glycerol fats (triglycerides) and stearyl alcohol.
Some antiperspirant products also include an ingredient called PEG-8 distearate,
which makes it easier to wash the product off in the bath or shower at the end of
the day.
6. Parabens
• Parabens are a type of preservative found in many personal care products.
The vast majority of antiperspirants and deodorants do not contain
parabens because antiperspirants and deodorants are generally selfpreserving.
7. Propellants
• Aerosol antiperspirants and deodorants are designed to work via a thin
film which is propelled onto the skin. To create this film, products contain
low, medium and high pressure propellants which produce a strong, but
comfortable, spray to reach the skin. These propellants are commonly
butane, isobutane and propane
How Do Deodorants Work?
Perspiration itself is almost odorless. Most of the odor that accompanies •
perspiration is caused by the action of bacteria. Deodorants reduce this odor
in one of three ways: by preventing the action of bacteria on the perspiration,
by preventing the secretion of perspiration, or by masking the offensive odor
with a pleasant one.
Deodorants that kill or inactivate bacteria contain antiseptic substances, such •
as alcohol, formaldehyde, and boric acid. Chlorine compounds, e.g.
hypochlorite and chlorhexidine, work by killing bacteria which may be
responsible for the odor.
Deodorants that mask perspiration odor contain perfumes. Essential oils and •
such disinfectants as carbolic acid simply mask the odor, making it less
offensive.
How do antiperspirants work?
Aluminium-based antiperspirants work by blocking the sweat •
ducts, thereby reducing the amount of sweat that reaches the
skin’s surface. Aluminium salts are soluble as long as the
formulation is acidic (low pH). When they are applied to skin
and come in contact with sweat, the pH rises causing the
aluminium salts to precipitate out and form a plug over the sweat
glands. Sweat continues to be produced by the sweat gland but it
just isn't able to reach the surface of the skin.
Diphemanil methylsulfate is a drug that opposes the action of the •
parasympathetic nerves that control sweat production.
Healthy effect
1. Aluminum toxicity
aluminum itself adversely affects the blood–brain barrier, is capable of causing DNA
damage, and has adverse epigenetic effects
2. Breast cancer
2004 and 2005 studies led by researcher Philippa Darbre, hypothesizes that particular
substances in deodorants, such as preservatives called parabens, or bolts such as
aluminum chloride used in antiperspirants, get into the bloodstream or
accumulate in breast tissue, where they enhance or emulate the effects of
estrogen, which stimulates the growth of cancerous breast cells
3. Renal dysfunction
The agency warns people with renal dysfunction to consult a doctor before using
antiperspirants containing aluminum
4. Deodorant crystals containing synthetically made potassium alum were found to
be a weak irritant to the skin. Alcohol-free deodorant is available for those with
sensitive skin.