Originally Posted by Smallaxe
regardless of how you interpret that article about pre-emergent qualities of some components of corn meal and that various similar components were created by modifications, doesn't change the fact that corn gluten is quality animal feed, worth money...
Their use of the word by-product was an error on the part of the author...
What I did learn though is that: ... "hydrolyzed proteins from corn and other grains that were shown to have higher levels of herbicidal activity..." and that ingredient is now listed in many foods for us to eat... thanks for the heads-up on our consumption of natural(manmade) herbicides...
I think there is a little confusion in the semantics of the use of waste product in my post above that I would like to clarify. I should have used by-product instead of waste product. Just because something is a by-product does not mean it is worthless. As defined by Webster: A by-product is a secondary product derived from a manufacturing process or chemical reaction. It is not the primary product or service being produced. A by-product can be useful and marketable or it can be considered waste.
The primary products of the wet milling of corn grain are corn syrup, corn starches, and corn oil. The value of these products "pay" for the milling process. Germ meal, hulls and gluten meal are by-products of this process and each has value on its own. The key is that the process is not primarily done to create these products. Sometimes people call by-products of a process that exhibit value on their own as co-products.
However, the point still is, as a co-product of a large scale commodity process, the use of corn gluten as a preemergent herbicide seems very expensive.
One possibility is that the Iowa State patent specifies additional processing steps on the corn gluten meal as generated from the corn wet milling process before it is sold as the herbicide. That may very well be the case and the reason for the relatively high cost. For example, you mention "hydrolyzed " corn gluten in your note. That sounds like there may be additional steps in the process. Do you know if this is true?
I hope this clarifies what I meant above. Thanks for the feedback.
for a good overview of the wet corn milling process and its primary and co- products.