WHO Guidelines on Good Agricultural and Collection Practices (GACP) for Medicinal Plants
(2003; 80 pages) [French] [Spanish] View the PDF document
Table of Contents
View the documentAcknowledgements
View the documentForeword
Open this folder and view contents1. General introduction
Open this folder and view contents2. Good agricultural practices for medicinal plants
Open this folder and view contents3. Good collection practices for medicinal plants
Close this folder4. Common technical aspects of good agricultural practices for medicinal plants and good collection practices for medicinal plants
Close this folder4.1. Post-harvest processing
View the document4.1.1. Inspection and sorting
View the document4.1.2. Primary processing
View the document4.1.3. Drying
View the document4.1.4. Specific processing
View the document4.1.5. Processing facilities
View the document4.2. Bulk packaging and labelling
View the document4.3. Storage and transportation
Open this folder and view contents4.4. Equipment
View the document4.5. Quality assurance
View the document4.6. Documentation
Open this folder and view contents4.7. Personnel (growers, collectors, producers, handlers, processors)
Open this folder and view contents5. Other relevant issues
View the documentBibliography
View the documentAnnex 1. Good Agricultural Practice for Traditional Chinese Medicinal Materials, People's Republic of China
Open this folder and view contentsAnnex 2. Points to Consider on Good Agricultural and Collection Practice for Starting Materials of Herbal Origin
View the documentAnnex 3. Good Agricultural and Collection Practices for Medicinal Plants (GACP), Japan
View the documentAnnex 4. A model structure for monographs on good agricultural practices for specific medicinal plants
View the documentAnnex 5. Sample record for cultivated medicinal plants
View the documentAnnex 6. Participants in the WHO Consultation on Good Agricultural and Field Collection Practices for Medicinal Plants
 

4.1.4. Specific processing

Some medicinal plant materials require specific processing to: improve the purity of the plant part being employed; reduce drying time; prevent damage from mould, other microorganisms and insects; detoxify indigenous toxic ingredients; and enhance therapeutic efficacy. Common specific processing practices include pre-selection, peeling the skins of roots and rhizomes, boiling in water, steaming, soaking, pickling, distillation, fumigation, roasting, natural fermentation, treatment with lime and chopping. Processing procedures involving the formation of certain shapes, bundling and special drying may also have an impact on the quality of the medicinal plant materials.

Antimicrobial treatments of medicinal plant materials (raw or processed) by various methods, including irradiation, must be declared and the materials must be labelled as required. Only suitably trained staff using approved equipment should carry out such applications, and they should be conducted in accordance with standard operating procedures and national and/or regional regulations in both the grower/collector country and the end-user country. Maximum residue limits, as stipulated by national and/or regional authorities, should be respected.

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