Herbal Extract preparation

[Guest guest]

Hi Dr. Dobriyal & Hi All,

 

Please see query below. If you can enswer, please send a copy to

yashpal malik <ypsmalik.

 

Best regards,

Phil

 

> Hi Phil, Can you elaborate the cold infusion method for aqueous

> extract preparation? Why is there need to dry the material before

> making extract? Cannot we directly triturate and then go for

> boiling for 2-3 hrs? Is there any simple method to prepare aqueous

> and alcoholic extract without using any specific apparatus?

> Thanks. Yash, yashpal malik <malikyps, Veterinary

> Diagnostic Medicine, St. Paul, Minnesota, USA

 

Hi Yash,

 

Perhaps the main reasons to DRY the ingredients beforehand are:

 

(a) While waiting to be processed, dried material is less prone to

fungal attack/chemical deterioration,

and

(b) Quality-control (re dosage, or mixing with other ingredients) is

more precise with dried material because the wet matter of freshly

harvested plant ingredients can vary by a factor of 2-3 or more.

 

For example, the DM of common Irish herbage (pasture grass) can

vary from 11% if harvested on a wet day, to 33% if harvested at the

end of a very hot, dry spell.

 

However, I am a novice in herbal medicine and feel incompetent to

answer your other queries. Therefore, I have forwarded your mail to

colleagues on three Lists [EthnoVeterinaryMedicine - EVM, Vet

Botanical Med Assoc - VBMA and Traditional Chinese Herbal Medicine] for

comment. We have some of the world's herbal experts on those

Lists.

 

Yash, are you a member of those lists? If not, email me off-list and

I will give you details of how to join.

 

Best regards,

Phil

 

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Best regards,

 

 

WORK : Teagasc Staff Development Unit, Sandymount Ave., Dublin 4, Ireland

WWW :

Email: <

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[Guest guest]

Hi All,

 

See this, from " Dobriyal R.M " <dobriyalrm

 

1. Cold infusion: Coarse powder of dried herbs to be soaked in

about 8-10 times water for 20-24 hrs. After that it is filtered and

concentrated to obtain a thick liquid or dried to powder.

 

2. Yes, it is important to dry the material. The fresh material if

boiled with water will become a colloidal mass without giving any

extractives. Imagine boiling spinach in a vessel with water V/s tea

leaves (tea bags) boiled (immersed) in hot water.

 

3. There is no specific equipment for water extract. It can be

processed using simple vessels which we otherwise use for

cooking (if to be made in minor quantities). For solvent extraction,

we need to have specific equipment necessarily.

 

Hope it clarifies. Regards, R.M.Dobriyal, DRF (Ext. 2767)

 

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Best regards,

 

 

WORK : Teagasc Staff Development Unit, Sandymount Ave., Dublin 4, Ireland

WWW :

Email: <

Tel : 353-; [in the Republic: 0]

 

HOME : 1 Esker Lawns, Lucan, Dublin, Ireland

WWW : http://homepage.eircom.net/~progers/searchap.htm

Email: <

Tel : 353-; [in the Republic: 0]

[Guest guest]

Hi All, & Hi Yash,

 

See Ihor Basko's mail to VBMA on cold infusion. [ihor, many

thanks].

 

Best regards,

Phil

 

PS. Now that the war in Iraq has started, I pray for its end ASAP,

with minimal casualties on all sides.

 

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Date sent: Wed, 19 Mar 2003 13:18:06 -1000

Ihor Basko

 

[Yash wrote]: " Can you elaborate the cold infusion method for

aqueous extract preparation? Why is there need to dry the material

before making extract? Cannot we directly triturate and then go for

boiling for 2-3 hrs? Is there any simple method to prepare aqueous

and alcoholic extract without using any specific apparatus? "

 

Hi and Hello:

 

I will just share my experience about this. Take tea, for example,

(Camelia sinensis sp?) The same tree and leaf, depending upon

how you process it, can be high in caffiene, or high in theophylline-

type components. Japanese Green Tea and Chinese Black tea

differ only in preperation, but one is higher in antioxidants that the

other. If you like peppermint tea, and grow it....you will find that

when the leaf is dried first before adding hot water, it will taste

stronger that the fresh plant raw.

 

Drying herb will change some of the internal components and

properties of the plant.

 

The deal is this: What phytochemical are you looking to extract?

Different plants do better with cold vs heat.....I will quote from

Michael Tierra's Book: Planetary Herbology: " Cold

fusion..............this is made by allowing the herbs to stand in cool

water for at least an hour. Some people prefer to place the infusion

in the sun to make what is called " sun tea " ; others, allow the

infusion to stand overnight. This method, tooo, is used for herbs

with DELICAT E VOLATILE OILS such as mints, hibiscus, lemon

grass and sandalwood, which are chiefly cooling or refridgerant in

nature. It is most commonly used with powders. Since powders

are already partially broken down, stirring them into a cup of cool

water and allowing them to stand will sufficiently extract their

therapeutic substances. Certain herbs, such as apricot seeds and

wild cherry bark are better extracted in cold water, since one of

their active ingredients (amygdaline) is harmed by heat. "

 

Leaves, and flowers need NOT to be boiled for 2-3 hours, but roots

and some kinds of seed do. Roots should be soaked overnight,

then boiled. If roots are powdered before boiling, then boiling time

could be reduced by half.

 

Leaves are usually added towards the end of boiling roots, barks,

and seeds, and not more than 20-30 minutes on simmer. Let

everything sit for awhile, until room temperature, then decant.

 

By mashing and squeezing the pulp through a natural fiber cloth, or

using a cold press, one could make fresh juices of freshly picked

leaves, fruits and flowers, and some kinds of roots.

 

To squeeze, dry, boil, or just soak, depends upon the plant and

what you are interested in extracting. Ihor. Ihor Basko, DVM All

Creatures Great & Small Veterinary Clinics Kauai, Hawaii

 

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Best regards,

 

 

WORK : Teagasc Staff Development Unit, Sandymount Ave., Dublin 4, Ireland

WWW :

Email: <

Tel : 353-; [in the Republic: 0]

 

HOME : 1 Esker Lawns, Lucan, Dublin, Ireland

WWW : http://homepage.eircom.net/~progers/searchap.htm

Email: <

Tel : 353-; [in the Republic: 0]