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OfflineDr Doolittle
I'm a teapot User Gallery


Registered: 07/15/12
Posts: 92
Loc: England Flag
Last seen: 7 years, 6 months
MUSHROOMS CARCINOGENIC?
    #16635436 - 08/02/12 06:19 PM (12 years, 5 months ago)

Hello dear Voyagers :rocket:

I want some feed back on the following issues: :mad2:

1. I recently had the opportunity of obtaining some mixed sawdust containing Medium-density fibreboard (MDF) and some other hardwood clippings.

I thought this would be ideal for mycelium substrate. Then I discovered that MDF contains 'Formaldehyde resins' which are potential carcinogenic and hazards to health.

However, I read up on some of the debate within this site and come to the conclusion that by the time the mycelium converts the substrate the fruit is pure. I reasoned that it is not the substrate that determines the toxicity of the mushroom since even the most deadly mushrooms derive their effects not from the substrate they consume but from their genetic structure.

So I'm not too worried about using MDF etc, :crazy2: anyway...

2. I was recently browsing through a readers digest book called 'foods that harm, foods that heal'(which I may later use as substrate) anyway, under the section entitled Mushrooms and Truffles p.248 it states some benefits and drawbacks of them.

Amongst the drawbacks it states: Fungi contains substances called hydrazines  and nitrosamines which have been shown to be carcinogenic... and may also be to humans... :thumbdown:

Whats all this about then? Can I not indulge myself with medicinal mushrooms for fear of ill health? :rolleyes:

Secondly again it states that: ...both wild and cultivated mushrooms have a tendency to accumulate toxic heavy metals such as cadmium and lead if grown in manure...

So what am I to make of all this... and what do you know...

:cheers:

Dd


--------------------

Liberty Caps (Psilocybe semilanceata) = Maggot Food ! Psilocybe Cyanescens: yet to determine. Amanita Muscaria = Fit for human consumption if properly prepared.


...I wouldn't even eat horseradish lest I upset the horses

:llamastare:

FeEliNg AgITaTeD... tRy sT. jOhN's WoRt

All Rights Reserved Including Animal/Human Rights

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OfflineGreen Goddess
Lost and Found Peace
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Registered: 05/23/11
Posts: 66
Last seen: 11 years, 5 months
Re: MUSHROOMS CARCINOGENIC? [Re: Dr Doolittle]
    #16649687 - 08/05/12 08:23 PM (12 years, 5 months ago)

It all revolves around a factor if mushroom produces enzymes necessary to break down 'Formaldehyde resins'. In fact you can start by researching how easily can it be broken down by natural factors like moisture, temperature and time. Also even if 'Formaldehyde resins' are present how high does their concentration need to be , to provide adverse effects in humans? Any way I wouldn't worry too much.


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InvisibleTheEaglesGift
The Nagual


Registered: 04/10/11
Posts: 10,554
Loc: Ixtlan, Mexico
Trusted Cultivator
Re: MUSHROOMS CARCINOGENIC? [Re: Green Goddess]
    #16653978 - 08/06/12 02:37 PM (12 years, 5 months ago)

You only live once. Eat up. There are toxins in everything we drink, breath and eat. Our body can handle a certain amount of toxins.

Fear is bad for your health and mind.

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OfflineDr Doolittle
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Registered: 07/15/12
Posts: 92
Loc: England Flag
Last seen: 7 years, 6 months
Re: MUSHROOMS CARCINOGENIC? [Re: TheEaglesGift]
    #16655338 - 08/06/12 05:48 PM (12 years, 5 months ago)

Quote:

Green Goddess said:
It all revolves around a factor if mushroom produces enzymes necessary to break down 'Formaldehyde resins'. In fact you can start by researching how easily can it be broken down by natural factors like moisture, temperature and time. Also even if 'Formaldehyde resins' are present how high does their concentration need to be , to provide adverse effects in humans? Any way I wouldn't worry too much.




:ruggedwink:

Quote:

TheEaglesGift said:
You only live once. Eat up. There are toxins in everything we drink, breath and eat. Our body can handle a certain amount of toxins.

Fear is bad for your health and mind.




:llamastare:

Good Stuff, well I found the pasteurised mixed wood MDF sawdust has a tendency so far to grow greenish mould on congealed bits. Just waiting to see how the sterilised reacts.

p.s. whats the best substrate in your opinions for growing Lions Mane, Reishi, blue/grey oyster and Nemeku (spell check)?


--------------------

Liberty Caps (Psilocybe semilanceata) = Maggot Food ! Psilocybe Cyanescens: yet to determine. Amanita Muscaria = Fit for human consumption if properly prepared.


...I wouldn't even eat horseradish lest I upset the horses

:llamastare:

FeEliNg AgITaTeD... tRy sT. jOhN's WoRt

All Rights Reserved Including Animal/Human Rights

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Offlineepogee
Stranger
Registered: 12/22/09
Posts: 15
Last seen: 10 years, 14 days
Re: MUSHROOMS CARCINOGENIC? [Re: Dr Doolittle]
    #16791077 - 09/05/12 03:56 AM (12 years, 4 months ago)

Formaldehyde is toxic by inhalation, and not by ingestion. So as long as you eat the mushrooms rather than turn them to dust and breathe them in, then you're ok. In fact, many mushrooms (and other foods) naturally contain some formaldehyde (eg shiitakes).

Personally, I'd be more concerned about any other chemicals that might be present in the resins.

Yes, most fungi concentrate heavy metals, so does some seafood, and many animals (including humans). As they are toxic, you don't want to be concentrating it in your own body or eating something that has concentrated heavy metals. The solution is to avoid industrial-polluted environments, air, soils, substrates etc altogether - Not so easy if you live in the city. The main concern is not to grow mushrooms on manure produced by horses living in areas known to be contaminated by heavy metals - eg horses grazing on industrial sites/landfill sites/spoil heaps from metal smelting or mining/scrap metal sites/shooting ranges/battle sites etc. Also, avoid eating mushrooms from areas even remotely near nuclear accident sites. Most nuclear power stations have had accidental releases of 'small' amounts of nuclear material - usually into rivers or groundwater. Mushrooms concentrate many radioactive substances - So if you live near a nuke, it's something to bear in mind.

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InvisibleAerial Boundaries
Wildlife Analyst

Registered: 07/30/12
Posts: 333
Loc: London
Re: MUSHROOMS CARCINOGENIC? [Re: epogee]
    #16791211 - 09/05/12 05:37 AM (12 years, 4 months ago)

Quote:

epogee said:
Formaldehyde is toxic by inhalation, and not by ingestion. So as long as you eat the mushrooms rather than turn them to dust and breathe them in, then you're ok.



"Formaldehyde is highly toxic to all animals, regardless of method of intake. Ingestion of as little as 30 mL (1 oz.) of a solution containing 37% formaldehyde has been reported to cause death in an adult human.[28] Water solution of formaldehyde is very corrosive and its ingestion can cause severe injury to the upper gastrointestinal tract."

:docbrown:


--------------------
"The issue is not whether people are 'good enough' for a particular type of society; rather it is a matter of developing the kind of social institutions that are most conducive to expanding the potentialities we have for intelligence, grace, sociability and freedom." - Paul Goodman (1964)

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OfflineDr Doolittle
I'm a teapot User Gallery


Registered: 07/15/12
Posts: 92
Loc: England Flag
Last seen: 7 years, 6 months
Re: MUSHROOMS CARCINOGENIC? [Re: Aerial Boundaries]
    #16804201 - 09/07/12 10:41 AM (12 years, 4 months ago)

Quote:

epogee said:
Formaldehyde is toxic by inhalation, and not by ingestion. So as long as you eat the mushrooms rather than turn them to dust and breathe them in, then you're ok. In fact, many mushrooms (and other foods) naturally contain some formaldehyde (eg shiitakes).

Personally, I'd be more concerned about any other chemicals that might be present in the resins.

Yes, most fungi concentrate heavy metals, so does some seafood, and many animals (including humans). As they are toxic, you don't want to be concentrating it in your own body or eating something that has concentrated heavy metals. The solution is to avoid industrial-polluted environments, air, soils, substrates etc altogether - Not so easy if you live in the city. The main concern is not to grow mushrooms on manure produced by horses living in areas known to be contaminated by heavy metals - eg horses grazing on industrial sites/landfill sites/spoil heaps from metal smelting or mining/scrap metal sites/shooting ranges/battle sites etc. Also, avoid eating mushrooms from areas even remotely near nuclear accident sites. Most nuclear power stations have had accidental releases of 'small' amounts of nuclear material - usually into rivers or groundwater. Mushrooms concentrate many radioactive substances - So if you live near a nuke, it's something to bear in mind.



Quote:

Aerial Boundaries said:
Quote:

epogee said:
Formaldehyde is toxic by inhalation, and not by ingestion. So as long as you eat the mushrooms rather than turn them to dust and breathe them in, then you're ok.



"Formaldehyde is highly toxic to all animals, regardless of method of intake. Ingestion of as little as 30 mL (1 oz.) of a solution containing 37% formaldehyde has been reported to cause death in an adult human.[28] Water solution of formaldehyde is very corrosive and its ingestion can cause severe injury to the upper gastrointestinal tract."

:docbrown:




Thank you for you contributions.

I think with the roadside, environmental pollutions the danger is consuming traces and accumulations of those toxins, that have gotten onto or into the fruit bodies etc

However, it seems that in their gathering up of nutriments in the development of the fruits that whatever chemicals lie dormant in the substrate are decomposed of at any rate are not taken up into the fruits themselves.

:prettyflyforawhiteguy:


--------------------

Liberty Caps (Psilocybe semilanceata) = Maggot Food ! Psilocybe Cyanescens: yet to determine. Amanita Muscaria = Fit for human consumption if properly prepared.


...I wouldn't even eat horseradish lest I upset the horses

:llamastare:

FeEliNg AgITaTeD... tRy sT. jOhN's WoRt

All Rights Reserved Including Animal/Human Rights

Extras: Filter Print Post Top
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