Guar gum yog galactomannan. Qhov piv ntawm mannose rau galactose yog 2 ∶ 1. Mannose tsim cov saw tseem ceeb, thiab txhua ob lub mannose txuas ib galactose.
Classification code CNS 20.025; TIAB SA 412
Lub cev thiab tshuaj muaj zog
Dawb los yog me ntsis daj-xim av hmoov uas tuaj yeem ntws dawb, yooj yim nqus dej. Qhov ceev ntawm guar gum yog 1.492g / cm3, uas tuaj yeem yaj tag nrho hauv dej txias thiab dej kub, tab sis tsis nyob hauv roj, roj, tin, ketone, thiab ester. Vim tias cov tshuaj muaj me me ntawm fiber ntau thiab cellulose, nws yog lub teeb grey thiab translucent, thiab qee qhov yog granular lossis tiaj tus. Tsis muaj ntxhiab tsw lossis tsw ntxhiab me ntsis, nrog cov dej ruaj khov, nws tuaj yeem ua rau hauv cov kua nplaum uas muaj cov viscosity tsawg (tag nrho yaj 1 feem pua guar kua nplaum, viscosity 3000mpa · s).
Cov tshuaj aqueous yog nruab nrab thiab muaj alkali tsis kam thiab acid tsis kam. Lub thermal stability ntawm guar kua nplaum yog tsis zoo. Thaum rhuab mus rau 40 degree nyob rau hauv ib lub sij hawm luv luv, qhov siab tshaj plaws viscosity tuaj yeem tau sai, tab sis nws tuaj yeem rov qab los rau tus nqi qub tom qab txias. Tsis tas li ntawd, lub sij hawm ntev ntawm kev kho kub kub yuav ua rau lub degradation ntawm guar kua nplaum thiab txo cov viscosity. Thaum rhuab ntawm 80 ~ 95 degree rau ib lub sij hawm, lub ntsiab saw glycosidic daim ntawv cog lus yuav tawg, thiab viscosity yuav ploj.
Nyob rau tib lub sijhawm, cov tshuaj yuav poob nws cov thermal reversibility, thiab cov viscosity yuav rov qab tsis tau. Guar cov pos hniav yog lub ntuj macromolecular compound, uas yooj yim decomposed los ntawm enzymes thiab cov kab mob thiab tsis tuaj yeem khaws cia rau ntev. Thaum boric acid los yog kev hloov pauv hlau ions (xws li Ti) ntxiv, viscosity ntawm guar kua nplaum ntxiv, los yog gel yog tsim ntawm tus nqi pH. Lub endosperm ntawm cov noob ntawm guar taum thiab pseudopsoralea corylifolia yog npaj los ntawm roasting, extracting nrog dej kub, tshem tawm insoluble tshuaj, tsom xam, ziab, thiab crushing.
Toxicological hauv paus
① LD50: (rat, mob qhov ncauj) 7060 mg/kg (BW).
② ADI: tsis tas yuav tsum tau (FAO/WHO. 1994).
③GRAS:FDA-21CFR 184.1339.
Daim ntawv thov ntawm thickener
GB {{0}} qhia tias qhov siab tshaj plaws ntawm kev siv tshuaj yog 1.0g/kg; Qhov siab tshaj plaws ntawm cov khoom noj mis nyuj rau cov menyuam mos thiab cov menyuam yaus (raws li qhov ntau npaum li cas hauv cov zaub mov npaj tau noj) yog 1.0g / l. Nws tuaj yeem siv tau rau txhua yam khoom noj (tshwj tsis yog cov zaub mov hauv Daim Ntawv Ntxiv 2) raws li qhov xav tau ntau lawm.
Kev siv ntau npaum li cas hauv kev ua zaub mov, rau cov kaus poom ntsuab thiab daj taum, qab zib pob kws, asparagus, taum ntsuab, nceb, thiab lwm yam., 10g / kg; Cov kaus poom sardine thiab nws cov khoom, mackerel thiab mackerel, 20g / kg (xws li kua zaub puv); Carrots, 10 g / kg; Flavored yogurt tom qab fermentation thiab kho cua sov, 5g / kg; Dej txias, 10g / kg (xws li cov khoom kawg). Thaum siv, nws yuav tsum tau moistened ua ntej thiab yaj nyob rau hauv tag nrho stirring, txwv tsis pub nws yog ib qho yooj yim mus agglomerate. Guar cov pos hniav thiab ib co linear polysaccharides, xws li xanthan gum, agar κ- Hom carrageenan muaj zog adsorption, uas zoo heev txhim kho cov viscosity. Cov nyhuv nrog sophora taum cov pos hniav tsis muaj zog thiab viscosity nce me ntsis. Ntawm lub zog qis ionic, guar cov pos hniav muaj zog viscosity synergy nrog anionic polymers thiab anionic surfactants.
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