GB875760A - Improvements in or relating to the purification of pyrethrum extract - Google Patents

Improvements in or relating to the purification of pyrethrum extract

Info

Publication number
GB875760A
GB875760A GB14469/58A GB1446958A GB875760A GB 875760 A GB875760 A GB 875760A GB 14469/58 A GB14469/58 A GB 14469/58A GB 1446958 A GB1446958 A GB 1446958A GB 875760 A GB875760 A GB 875760A
Authority
GB
United Kingdom
Prior art keywords
extract
kerosene
crude
hours
mixture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB14469/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olin Corp
Original Assignee
Olin Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olin Corp filed Critical Olin Corp
Publication of GB875760A publication Critical patent/GB875760A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
    • A61K36/18—Magnoliophyta (angiosperms)
    • A61K36/185—Magnoliopsida (dicotyledons)
    • A61K36/28—Asteraceae or Compositae (Aster or Sunflower family), e.g. chamomile, feverfew, yarrow or echinacea

Landscapes

  • Health & Medical Sciences (AREA)
  • Natural Medicines & Medicinal Plants (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Alternative & Traditional Medicine (AREA)
  • Biotechnology (AREA)
  • Botany (AREA)
  • Medical Informatics (AREA)
  • Medicinal Chemistry (AREA)
  • Microbiology (AREA)
  • Mycology (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

A crude pyrethrum extract, especially one containing 20 to 30% by weight of materials extracted from pyrethum flowers, is purified by mixing the extract with a hydrocarbon solvent boiling within the range 125-350 DEG C., treating the mixture with trisodium phosphate dodecahydrate, heating it at 40 DEG to 70 DEG C. for 1 to 24 hours, chilling the mixture at -10 DEG C. to -30 DEG C. for 1 to 24 hours and separating the sludge so formed. It is preferred to dilute the crude with kerosene to a pyrethrin concentration of 10 to 15% and add 0.01 to 1% of trisodium phosphate dodecahydrate. The clarified extract may be treated with charcoal to remove colour and the so formed clear pyrethrin solution is used as such, or after further dilution with kerosene, as an insecticide.
GB14469/58A 1957-05-13 1958-05-06 Improvements in or relating to the purification of pyrethrum extract Expired GB875760A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US875760XA 1957-05-13 1957-05-13

Publications (1)

Publication Number Publication Date
GB875760A true GB875760A (en) 1961-08-23

Family

ID=22205988

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14469/58A Expired GB875760A (en) 1957-05-13 1958-05-06 Improvements in or relating to the purification of pyrethrum extract

Country Status (1)

Country Link
GB (1) GB875760A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008019920A1 (en) * 2006-08-17 2008-02-21 Unilever N.V. Processes for production of hoodia plant extracts containing steroidal glycosides

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008019920A1 (en) * 2006-08-17 2008-02-21 Unilever N.V. Processes for production of hoodia plant extracts containing steroidal glycosides
US7807204B2 (en) 2006-08-17 2010-10-05 Phytopharm Plc Processes for production of Hoodia plant extracts containing steroidal glycosides

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