04 

 SKC'lloN ■>. 



ACTION (»K K<VII KXTKAcr flMN CKr.ATINI/.KIi STAUCH. 



I'n>iii tlio point (if view of tli<' Siikt'-hn'wcr tlic cliiiti^» wliicli koji Mtlnlion 

 |iroi)uci-s ill tlif iiiitnn! of stnn-li is of tlif utmost iiii|M)rt!in('c, iiiiil it will on tliitl 

 nrcount In- neoilfnl to filter into somcwlmt iiiiniit«' MclailH coiutTiiiri!: ili» su-'lioii 

 linder varvinj; coiiiUtioiKs of tinir and tciin>eritun'. Tliiit :i riTnarkftMo cliaii;;u 

 does tftkc iiliico will lii- evident to any one wlio adds a few ciiltic (iMitiiiictren of a 

 tutored solution of koji to a *inantity of iliick starch- |iaste, espeeially it' tiic liittiT 

 Ik* at a temi>eratiire of alMnit 4')° or Uti'^C,. WitJiin a very short time, a few 

 minutes nt niost. the piste or jelly whirh U'fore would not liavo moved on 

 inverting; the vessel containin<; it, will heiome iu< li<piid lu* water, and, if the ll^'. ks 

 of cellulose he allowed to S'jttle, as transparent its water. This cannot U- 

 oltwTvcd in the onlinary )>rox»!«8 of inaiiiirictim-, hut tlie chan>j;<? taken pliux«. it 

 is only disjjuised hy the prusenee of a coii'^ider.ihle ipi.intity of inMiIiihle m itter- 

 In onh'r, therefore, to understand the ehi'inic.il n-actions involved in s;ik«''hrewin;;, 

 the first |)<)int is to ascertain the coiii|i<>siiiiiii of tlie clear, triie^iiiirent solution 

 ohtivined as ahove descrilrjd. 



Usini; inaU. extract iiisteail of koji extr.ict a similar change would Iw 

 oliserveil, and the nature of tlie n-sultinj; solulinn lias Ikh-u vi'ry thoroughly 

 exaininud hy OSiiUivan'^, and luiire n-eently hy Ihown and Heron f. 'I'Ih! resii't 

 of their investif^atioiis has hccn to provetli.it dextrin and maltotte an- the only 

 juddiicts of the solution of starch hy milt extnK't, and that tin- chaiij^u may U? 

 represented hy delinite chemical eipiations. wliich are diircn-iit accordiiij^ to llic 

 teinpeniture at which the eoiiversioii takes place. Thus accordiii;» to (j'Sullivaii 

 when the malt solution is allowed to act U| on ^gelatinized starcli at tlie ordiriiry 

 tem|M'ratiiic' of the air, or at any tem|H'r.iture whatever Ik'Iow C>'.PC , the r(':u;lioii 

 is represented hy his etpiation A. 



A (■.((J'-M„0„.) i 4H,0 = 4C'=H,,0., -| 2C"II„0... 



^!(l!lllllL■ sbircli >'iilt<i»<> /-ilcxlrin iii. 



That is to say that the pro<lucts of the resu-tion contain (>7".S |>;'r cent of 

 m.'lltosi! ami H'2'2 |K'r < I'lil. of divliin. Mud have ;i s]« i ilic int.iloiv )M)v\cr. | </ j 

 = 17L •(■. 



IVtween the tempenituns ()4- and (id iJ. the re:iclion is rrpn-seiiti-d hy the 

 B' cqimti'in 



I',. fxC il„()„,i , :ni,() = :j(;' ll,,n„ :5<:'MI,.(>,, 



Soliililf »larcli Miijlimr '(Icxlrin ii. 



Between »57^ and TO'^C". etpiation B i\-pa's<-nl> the ix*aotion :^^ 



B 6(C'ni" 2 ILO = 2<;"i!aO„ f 4r'nT»o,„ 



SoluMc V . Miiliinr. .-(.Ifxtnn I. 



•Joiirn. f'tipin. Soo. 1H76. vol. II. p. i-."..ti. ;ii«.'i i", ■. (ran«, p. 'il<> 

 t It>i<t. I87!«. Trin«. p. .V»".. Ac. 



