Application of Different Types of Carboxymethyl Cellulose on the Properties of Instant Cocoa Beverages with Added Cocoa Shell

Cilj ovog diplomskog rada bio je ispitati utjecaj dodatka kakaove ljuske, karboksimetil celuloze i postupaka sušenja na svojstva instant kakao napitaka. Kakaova ljuska za proizvodnju pripremljena je tako da je odvojena od kakaovog zrna nakon prženja, samljevena te se nakon mljevenja prosijavanjem izdvojila frakcija manja od 71 μm koja se koristila u proizvodnji. Instant prahovi su se proizvodili aglomeracijom i sušenjem (liofilizacija i konvekcijsko sušenje u sušioniku pri 40 °C). Kakaova ljuska se dodavala u udjelima od 5, 10 i 15 %. Karboksimetil celuloza koja se koristila za proizvodnju bila je u praškastom i tekućem obliku. Nakon proizvodnje instant prahova određena je boja, vlažljivost, specifični volumen, nasipna gustoća i udio ukupnih polifenola prema modificiranoj Folin-Ciocalteu metodi. Rezultati su pokazali da se povećanjem udjela kakaove ljuske u instant kakao napitcima povećavalo vrijeme vlaženja, a boja prahova sušenih konvekcijskim sušenjem bila je svjetlija u usporedbi s uzorcima sušenim liofilizacijom. Nasipna gustoća praha bila je veća kod uzoraka s većim udjelom ljuske. Kod uzoraka s većim udjelom kakaove ljuske, udio ukupnih polifenola bio je manji u usporedbi s uzorcima bez kakaove ljuske.The aim of this thesis was to examine the influence of the addition of cocoa husk, carboxymethyl cellulose and drying procedures on the properties of instant cocoa beverages. The cocoa shell was prepared for production by being separated from the cocoa bean after roasting, milled, and after milling a fraction smaller than 71 μm was separated by sieving, which was used in production. Instant powders were produced by agglomeration and drying (freeze-drying and convection drying in an oven at 40 °C). Cocoa husk was added in proportions of 5, 10 and 15 %. The carboxymethyl cellulose used for production was in powder and liquid form. After the production of instant powders, the colour, wettability, specific volume, bulk density and content of total polyphenols according to the modified Folin-Ciocalteu method were determined. The results showed that increasing the content of cocoa shell in instant cocoa beverages increased the wetting time, and the colour of the convection-dried powders was lighter compared to the freeze-dried samples. The bulk density of the powder was higher in samples with a higher content of shell. In samples with a higher proportion of cocoa shell, the content of total polyphenols decreased compared to the samples without added cocoa shell