talc

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talc

 [talk]
a native hydrous magnesium silicate, sometimes with a small amount of aluminum silicate; used as a dusting powder. The inhalation of talc is associated with a wide variety of respiratory disorders.

talc

(talk),
Native hydrous magnesium silicate, sometimes containing small proportions of aluminum silicate, purified by boiling powdered talc with hydrochloric acid in water; used in pharmacy as a filter aid, as a dusting powder, and in cosmetic preparations.
[Ar. talq]

talc

(talk) a native hydrous magnesium silicate, sometimes with a small amount of aluminum silicate; in purified form, used as a dusting powder and pharmaceutic aid.

talc

[talk]
Etymology: Ar, talq
a native, hydrous magnesium silicate, sometimes containing a small proportion of aluminum silicate, used as a dusting powder and adsorbent in clarifying liquids. Also called talcum.

talc

 A dry lubricant used in products that may contact mucocutaneous surfaces–eg, condoms, dental dams, and non-surgical latex gloves; talc was banned from surgical gloves in 1991 by the FDA

talc

; talcum finely powdered hydrous magnesium silicate; used as a base for topical application of an active medicament; reduces friction at skin surface; does not absorb moisture (see Table 1 and Table 2)
Table 1: Topical agents with astringent/anhidrotic action
AgentFormulation
AlcoholIMS; 70% isopropyl alcohol; spirituous lotions, e.g. 3% salicylic acid in IMS; surgical spirit; evaporates to cool skin and reduce maceration
Formalin10% solution causes a toughening effect on epidermis (may cause hypersensitivity)
AgNO320-25% solution (higher strengths can be used as NaCl in sweat mitigates the action of AgNO3)
Tannic acidAs dusting powder, or as borotannic complex giving an antifungal action
HamamelisWitch hazel: cooling effect
CalamineLotion or cream with a mild astringent and absorbent action; it will take up 1.5 times its own weight of water
Salicylic acid 3%Astringent and antiseptic as a lotion or dusting powder
Burow's solutionAluminium acetate ∼5% solution; diluted 1:3 in water to reduce sweat flow
TalcAntipruritic and absorbent; used as a base for dusting powders and to lubricate the skin
Dusting powdersAstringent medicament (e.g. tannic acid, salicylic acid), or antifungal medicament (e.g. boric acid, undecenoic acid) and lubricating applications in a talc, kaolin and/or zinc oxide base
OthersAgents that coincidentally show astringent/anhidrotic action include potassium permanganate, sodium polymetaphosphate, ferric chloride and compound tincture of benzoin

Note: Astringents act variously to cause protein precipitation (and thereby reduce epidermal maceration), cooling of tissues, constriction of sweat ducts and skin lubrication); anhidrotics act variously as cooling agents, astringents, and to alter epidermal reaction to retained sweat (e.g. reduce friction at the skin surface).

Both are used to control hyperhidrosis and bromidrosis by preventing the accumulation of sweat, increasing the skin's reaction to the action of sweat, and to compensate for any loss of resistance to infection at the skin surface.

IMS, industrial methylated spirit.

Table 2: Topical dusting powders for use on skin
Base agents
Starch, Chalk, Magnesium carbonate, Kaolin, Talc, Zinc oxide, Zinc stearate The base agent should augment the action of the active ingredient
Active ingredients
ExamplesActionIndicated use
Boric acid 5%
Salicylic acid 3-10%
Alum 10% Benzocaine 10%
Calamine
Chlorphensin 1%
Menthol 2%
Phenol 2.5%
Sodium perborate 15%
Sodium poly-metaphosphate 5%
Benzoin 10%
Undecenoic acid 2%
Zinc undecenoate 10%
Active against foetid bacteria
Astringent, antiseptic, antifungal
Strongly astringent and deodorant
Analgesic and antipruritic
Soothing, absorbent
Fungicidal
Fungicidal
Antipruritic and fungicidal
Antiseptic
Astringent
Astringent
Fungicidal
Fungicidal
Bromidrosis
Hyperhidrosis and mild fungal skin infection
Hyperhidrosis and bromidrosis
Irritant skin conditions
Irritant skin conditions
Fungal infections
Fungal infections
Irritant fungal infections
Mild skin infection
Prophylaxis of fungal infection
Hyperhidrosis
Fungal infection
Fungal infection

talc

(talk)
Native hydrous magnesium silicate used in pharmacy as a filter aid, as a dusting powder, and in cosmetic preparations. Also called talcum.
[Ar. talq]

talc

a naturally occurring hydrous magnesium silicate, sometimes with a small amount of aluminum silicate; used as a dusting powder. Called also talcum.

talc granulomatous peritonitis
talc, or starch, spilled in the peritoneal cavity provokes the development of granuloma by e.g. the serous membrane.
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