salicylic acid biosynthesis and metabolism ppt and salicylic acid pathway in plants ppt
Properties, & Application
of Salicylic Acid in the
Treatment of Acne
CHEM 4201 – Spring 2014 Introduction
☤Salicylic Acid – name derived from Salix (Latin name for the willow tree)
☤Organic Compound – Chemically Synthesized & Biosynthesized
☤Functions as a Hormone in Plants – Defense Against Pathogens
☤Vast Array of Benefits & Uses
• Applications in Food Chemistry, Textiles, Medicine, Cosmetics, Dermatology
Food Chemistry – preservative
Textiles – synthesis of dyes; used for its antibacterial properties
Medicine – relieve fever and pain
Cosmetics – preservative; has exfoliating and cleansing properties
Dermatology – seborrheic dermatitis, viral warts, psoriasis, acne vulgaris, and
☤4000 BC – Assyrians used the extracts of willow leaves to treat painful musculoskeletal
joint pain conditions, as well as an antipyretic drug to reduce fever.
☤400 BC – Hippocrates (Greek physician; known as the “father of Western medicine”)
used willow bark extract to treat fever and relieve pain associated with childbirth.
☤1828 – Johann Buchner was the 1 to extract and purify salicin (later determined to be
the pharmacological active compound in 1935 by Raffaele Piria) from willow bark.
☤1859 – Kolbe & Schmitt discovered the Kolbe-Schmitt reaction to chemically synthesize
salicylic acid from phenol, allowing for it to be produced on a large commercial scale.
☤1893 – Felix Hoffman was the 1 to synthesize pure and stable acetylsalicylic acid
(known as aspirin).
Synthesis of Salicylic Acid
☤Synthesis From Natural Sources ☤Industrial Synthesis
Synthesis from Natural
☤Salicylaldehyde from Meadowsweet Flowers (Filipendula ulmaria)
• Extracted by Pagenstecher (Swiss pharmacist) as early as 1835.
• Oxidized by Lowig (German chemist). Industrial Synthesis from
☤Kolbe-Schmitt Reaction by Hermann Kolbe & Rudolf Schmitt in 1859 Chemical Properties
☤Common Name: Salicylic Acid
☤Molecular Formula: C H O
7 6 3
☤Molecular Weight: 138.12074 g/mol
☤IUPAC Name: 2-hydroxybenzoic acid → α-hydroxy acid
☤Appearance: Colorless Crystalline Powder to White Needle-Shaped Crystals
☤Taste: Acrid Beneficial Properties
What is Acne Vulgaris?
☤It’s a common chronic disease of the pilosebasceous
unit of the skin, affecting more than 80% of
adolescents and often persists into adulthood
☤Cause – obstruction of the pilosebasceous canal
• oily skin (excess sebum production)
• non-inflammatory lesions (open/closed
• inflammatory lesions (papules, pustules, and
☤Normally affects the face, upper chest, and back –
areas that have the densest amount of sebaceous
Salicylic Acid – Acne
☤Salicylic acid is applied topically to the skin affected by acne vulgaris.
• strong keratolytic and comdelytic agent
• increases penetration of other products
• has a slight anti-inflammatory effect
• bacteriostatic and fungistatic at low concentrations – competitive inhibition of pantothenic acid
☤Designing an experiment that incorporates the synthesis of salicylic acid from a natural
source, such as the flowers of the meadowsweet plant, wintergreen plant, or bark from
the willow tree, and utilizing the salicylic acid to make a more natural product used to
treat acne, rather than using industrially synthesized salicylic acid. References
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