The toxicity of flours towardssaccharomyoes cerevisiæ (top fermentation brewery yeast)
✍ Scribed by Baker, Jullan L. ;Hulton, H. F. E.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1909
- Weight
- 448 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0368-4075
No coin nor oath required. For personal study only.
✦ Synopsis
k i n g gCCah?St in prcscncc of distilled wntcr, less in supply water, a n d largely counteracted by potassium sulplintc aid somo other salts.
- Bnkcrs' ycnst is iiiinffcctctl by thc flour toxin, nnd fcrmcnta with cqunl readiness tlough Iircpnrcd with 4. Brcwcrs' yeast is unablo to fcrmcnt inorc tlinii a sninll fraction of thc cxistine carbohvdratcs in flour
In thc prcscncc of potamium sulpliatc tlic yield Of gals from bruwcm' yeast whcn fcrmcnting iiivcrt sugar is praoticnlly unnltcrcd.
- Flour czlraef.--It wns thought tliat thc subshiicc wliicli is toxic to bmwciu' ycnst might bo pnrtinlly soluble 1 c.c. of carbon dioxit~o cvo~vcd in R hnnrs.
wIicn tIic dough is made with &tilled witer. 5. Brcwcn' yeast, on bcing grown consecutively tlircc timcs in a \vliisl~y-inash wort was found to hnvo tlic propertics of n bakcrs' yeast, sucli propcrtics showing but littlc dcterioration wlicn tlic ycast wns grown suc-... " ..--"-Yoat. I----;*-Flour oxtract Flour cxtract. GO C.C. witli GO O.C. potnssium sulpltntc.
ccssivcly thrco times in n brcwcrs' hopped wort.
II. Bnkcrs' ycnst sccms to owc its toxin imniuiiity to tlic fact that it hns bccii produced in a wort iiintlo from ccrcnls, such as barlcy and ryc, containing toxiiis, only tliosc cells thnt can rcproducc in sucli nn cnvironmcut tlnrvivin and trnnsmitting this sclcctcd immunity to tlic crop cofccted. SucIi ycast will csliibit n niucli grcntcr fcruicntntivc power in prcscncc of flour toxins than a brccwcw' ycnst grown in n boilccl and tlicrcfom IIOIIpoisonous wort. Distilled satcr. THIS TOXlClTY OF FLOURS TO\VAltDS SACCIIA HO-Jl YCES CERE V l S l d (TOP FEltl\lENT~ITION DIIE\VERY YEAST). ny JULIAS I,. DAKIB AND u. F. B. IIULTOH.
111 the ~ircvioiis piper \vc Iitrvc shown tlint tlic rCilSOli uf tho tlilfcrcncc in tlic lcrnic~itrrtivc po~vcr of bnkcm' and IJIVWI~' ycnst iii ii riicclinni of flonr i i i i t l orilinnry wittcr \vo~~ltl rrlipcnr to IJC tho si~sccptibilitg of the Iiittcr to the toxic botlics whicli niu present in tlic ilour. Uistillcry ycrrst wliicli is uscd by bnltcrs is tlic outconic of Icprutlncbion i n a incdiuin i n which only thoso cells thnt arc imniuno to thc toxicity of an unboilcd ccrcnl wort cnn survivc and mproduce. Hcncc dietillcre' yeast has a J l l U O h gmatcr immunity to thc toxic propcrtics of flour than brcwcrs' yenst.
This pnpcr is tlic outconic of a furthcr invcstigotion on tlic effect of tlic toxic eitbstniices in wlicnt flour on Scteclicirornyccs. Siiicc tlic inarkctl diflerciicc in fcnncntntivc cnpncity in flour-dough of tho two ycnsts whiclt w o Iiirvc iilivndy disciissctl docs not cxtuiitl to tlicir nction 011 iiivcrL siigtrr, it WRY tliouglit probnblo t l i i r t by tlic inrcstigiitiun uf tho I~chaviunr of Llio two gcasls towtrrds tlilfcrcnL fcrinctiliil~lo incdin we niiylit find tiuitio coininon fwtor \rhich could bo rqctrdcd ~tst~ssisting in 1111 iithibitiug IictiUli Pcrinciitrrtioiis with brc\vciu' iuitl bsltclu' ycnsts WCI'U c:rrrried out with-1. lnrcrt sitgar. 2. Aqiwoim flonr cstriict. iriitl fltinr. fi. I)is~illnrn' wtirL (ninlL rnnizc ciritl a t ! ) .
- Cult1 n(pt!oIls cxtrirctf of t l i s t i l l t d nitilt. 7. Tliu n p p n r n ~~~~j need in tlicsll uxpcriinciits wis tho miiic 11s tlint described in tlic prcvioiis piper. 20 grins. of flour wcrc stircd into nil even pnsto with 50 C.C. of solution, 1 grm. of prcsscd yciiat wns tlicn incorporutcd nnd tlic fcrnicntatioii cnrried out at n tcnipcrnturc of 110' 3'. 1. Invert sicgar.-Tho following restilts show tliirt bnltcrs' niid brcwcrs' ycnst bchnvc nlilto to n solution of irivcrt sugar. 50 C.C. of ii 2.0 per cent.. xolution of tho HII iir in tlistillcd wirtcr \vns fcrn~cnlcd at 110' X ' . with d L r s ' n i i t ~ ~irc\pcrs' ycwsl.. 0 1 1 bl'C!\VCIX' YCiLSt. 1 X t ~I l O l . lll\W% tUl$Jll' Cllltl fl(1Ilr. *I. I\cl\lC(JllS h l l r UlllJoilctl llllllt \vort pre~lllretl frolll ~re\rc13' n11111.