HMCS Max Bernays Pre-Deployment Brief (May 2024).pptx
Introduction and Classification of Fibres, sutures and surgical dressings
1. PHARMACOGNOSY OF Fibres Introduction
Academic In-Charge, HOD,
PritamJuvatkar
Mobile :
Email : pritamjuvatkar@gmail.Com
9987779536
Department of Pharmacognosy and Phytochemistry
Konkan Gyanpeeth Rahul Dharkar College of
Pharmacy and Research Institute, karjat
3. C l a s s i f i c a t i o n o f F i b r e ( N a t u r a l
F i b r e s )
V e g e t a b l e F i b r e s o r B a s t F i b r e s
F i b r e
• They are also known as skin fibres.
• They are collected from the phloem (the “inner bark” or the skin) or bast surrounding the stem of certain plant i.e., mainly dicotyledonous
plants. They support the conductive cells of the phloem and provide strength to the stem
• Bast fibres from stem: Examples: Flax, Hemp, Jute etc.
• Bast fibres from leaf: Examples: Ananas, Agave, Palm etc.
• Bast fibres from seed: Examples: Cotton, Soya, Coir etc.
• Bast fibres from fruit: Examples: Luffa, Coir etc.
• Bast fibres from grass: Examples: Bamboo, Totora etc.
• Bast fibres from wood: Examples: Hard wood, Soft wood etc.
4. C l a s s i f i c a t i o n o f F i b r e ( N a t u r a l
F i b r e s )
M i n e r a l
F i b r e
• They include the asbestos group and are long fibres.
• Six minerals have been classified as “asbestos” including
• Chrysotile,
• Amosite,
• Crocidolite,
• Tremolite,
• Anthophyllite and
• Actinolite.
• Short mineral fibres are wollastonite, palygorskite etc.
• They are also known as fibrous proteins. They consist of
biologically important proteins, mutations etc. Examples:
Collagen, actin.
B i o l o g i c a l f i b r e s :
F i b r e
5. C l a s s i f i c a t i o n o f F i b r e ( N a t u r a l
F i b r e s )
W o o d F i b r e A n i m a l f i b r e s :
• They are usually cellulose elements that are extracted from trees
and are used to make materials including paper
• There are different forms of wood fibres including ground wood,
thermomechanical pulp and bleached or unbleached sulfite pulps.
• Sulfite pulp is obtained by pulping process that is used to remove
the lignin bonding the original wood structure
• They are obtained from different parts of animals and consist
largely of particular proteins.
• Examples: Silkworm silk, catgut, wool; Hair such as cashmere
wool, mohair and angora; Fur such as sheepskin, rabbit, milk
etc.
F i b r e
6. C l a s s i f i c a t i o n o f F i b r e ( M a n m a d e
F i b r e s )
S y n t h e t i c f i b r e s : S e m i s y n t h e t i c
f i b r e s
• They are man-made fibres derived from the natural fibres, mainly
cellulose,
• e.g., nylon and terylene.
• Nylons are polymers of adipic acid and hexamethyl diamine,
whereas terylene is a polymer of ethylene glycol and
terephthalic acid.
• Semi-synthetic fibres are made from raw materials with natural
long-chain polymer structure and are only modified and partially
degraded by chemical processes.
• Generally they are regenerated cellulose derivatives. Examples:
Rayon, bamboo fibres etc.
F i b r e
7. C l a s s i f i c a t i o n o f F i b r e ( M a n m a d e
F i b r e s )
P o l y m e r f i b r e s M i c r o f i b r e s :
• They are based on synthetic chemicals
and made from polyamide nylon,
polyester, polyvinyl chloride etc.
• Semi-synthetic fibres are made from
raw materials with natural long-chain
polymer structure and are only
modified and partially degraded by
chemical processes.
• Generally they are regenerated
cellulose derivatives. Examples:
Rayon, bamboo fibres etc.
M e t a l l i c f i b r e s :
• These fibres are prepared from the
metals such as copper, gold or silver
• and extruded or deposited from more
brittle ones such as nickel, aluminum or
iron.
F i b r e
