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Effect of different coagulation agents and added water on milk serum refraction index

Uticaj različitih koagulanata i dodate vode na indeks refrakcije mlečnog seruma

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Maćej, Ognjen
Jovanović, Snežana
Denin, Jelena D.
Vukićević, Danijela M.
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Abstract
The influence of different way of milk serum separation and the level of milk serum dilution on refraction index have been emphasized. Milk serum were obtained by separation from milk coagulated by 4 solution of CaCl2, 5% solution of HCl and rennet, respectively. The investigation involves determination of milk composition for morning and evening milking. The evening milk had higher content of both, milk fat and fat free dry matter, than morning milk. It has been emphasized, by statistical methods, that different coagualting agents have influence on refraction index of milk serum obtained for both, morning and evening milks. Addition of 10% and 20% of water to milk serum, respectively resulted in significant decreasing of refraction index. The accuracy of refraction index results decreased in the following order: milk serum obtained by 4 solution of CaCl2, milk serum obtained by 5 solution HCl and milk serum obtained by rennet. .
U radu je ispitivan uticaj različitih načina dobijanja mlečnog seruma i razblaživanja mlečnog seruma sa 10 i 20 vode na vrednost indeksa refrakcije. Mlečni serum je dobijen koagulacijom mleka pomoću 4 rastvora CaCl2, 5 rastvora HCl i pomoću sirila. Prvi deo istraživanja obuhvatio je određivanje sastava mleka dobijenog jutarnjom i večernjom mužom. Večernje mleko imalo je veći sadržaj mlečne masti (4,24%) i veći sadržaj SMBM (suve materije bez masti)(8,95%), u odnosu na jutarnje mleko, koje je imalo 3,5 mlečne masti i 8,62% SMBM. Statističkom obradom podataka (analiza varijanse i testiranje razlike između aritmetičkih sredina), ustanovljeno je da su različiti koagulanti imali uticaja na vrednost indeksa refrakcije mlečnog seruma kod mleka jutarnje i kod mleka večernje muže. Dodavanje vode mlečnom serumu, u količini 10 i 20 značajno je uticalo na smanjenje vrednosti indeksa refrakcije. Najpouzdaniji rezultati kod određivanja indeksa refrakcije dobijeni su sa mlečnim serumom pomoću 4 rastv...ora CaCl2, a zatim kod mlečnog seruma pomoću 5 rastvora HCl. Najmanje pouzdani podaci su kod seruma dobijenog koagulacijom mleka pomoću sirila. .

Keywords:
refraction index / milk serum / CaCl2 / rennet / hidrovodonična kiselina / indeks refrakcije / kalcijum-hlorid / mlečni serum / sirilo
Source:
Prehrambena industrija - mleko i mlečni proizvodi, 2000, 11, 3-4, 52-57
Publisher:
  • Univerzitet u Novom Sadu - Tehnološki fakultet, Novi Sad i Savez hemičara i tehnologa, Beograd

ISSN: 0353-6564

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Handle
https://hdl.handle.net/21.15107/rcub_agrospace_226
URI
http://aspace.agrif.bg.ac.rs/handle/123456789/226
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