Norskersword said:
Hey Joe,
I recall someone's post before the big crash regarding buckwheat honey. I remember them saying that this kind of honey has plenty of nutrients in it and that no nutrient needs to be added to a mead with this honey. Does your experience back this claim?
Well, yes with a big IF and I will explain below. I have exchanged emails with Chuck Wettergreen, a very experienced and knowledgeable meadmaker who has been using buckwheat for more years than I knew what it was. His intriguing posts can be read on old issues of MLD from back in the early 90's and up. His posts got me interested in natural mead, no nutrients as that is what he reported worked well for him. I have been experimenting ever since.
Now here is the IF; and why:
While its true Buckwheat honey has more nutrients in than most other honeys, experts such as Ken Schramm indicate it's FAN level (Free Amino Nitrogen) level is just 21ppm (parts per million). Ken considers a minimum of 130-200ppm FAN is needed for a healthy yeast growth . As you can see even with buckwheat added to my blend of honey I am therorectically far from that minimum. Still the proof is in the pudding and it works for Chuck and it has worked for me. So here's my theory I passed on to Ken and Chuck. It may be a perception not shared by others so take it as an opinion only until confirmed by more experienced and scientific people than myself. IF you use SOFT water, K1V-1116 and a blend of Buckwheat and some other honey(s) with no nutrients added to must it will stick or (go into stress?) and not finish. This is my experience. IF you use the same and substitute HARD water:
SOFT HARD
Calcium 10 240
Magnesium 2 50
Bicarbonate 15 250
Sulphate 5 500
Nitrate 5 40
Chloride 5 50
All figures in mgs per litre (ppm)
it will ferment from 1.100 to 1.008 in approximately 3 weeks.
Notice the minerals in hard water. The magnesium is needed and the calcium is I think the key. (but I could be wrong) I'm working backwards on my answer so I know there is an explanation but I am not technically scientific to prove it true. But here goes.
From a technical article on Beer I read that Calcium has a beneficial effect on the precipitation of wort proteins.
"Protein-H + Ca2+ (r) Protein-Ca + 2H+"
"The hydrogen ions released further reduce the PH which encourages further precipitation of proteins."
Now for those of you who don't boil and skim you may shortly understand why people who use some buckwheat and report success without using nutrients also do not usually boil and skim either. ( Note many of them also use unprocessed honey as there is a difference) The proteins that are not boiled and skimmed away are degraded or converted to simple substances by enzymes called proteases. These enzymes I believe are in the yeasts. The FAN level of the Buckwheat is enough to start a fermentation but more is needed to continue. The reduction of the PH then caused by the presence of calcium in the water encourages proteolysis, further reducing protein levels and increasing must Free Amino Nirogen levels. (FAN) This improves the level in the must and improves the health and vigour of the yeast.
That's pretty well my story and I'm sticking to it
at least until somebody sets me straight.
How's that for a wordy answer to your simple question?
The real answer is No, Buckwheat honey does not have plenty of nutrients in it but it does have more than most all other honeys and if you use a no boil blend mixture and Hard water it makes a delightful CW mead (named by me for Chuck WetterGreen and enjoyed by me immensely) without nutrients added.
Joe