The desorption isotherms of two durable meat products (sample 1 - durable fermented meat product and sample 2 - unheated durable meat product) by Dynamic Dewpoint Isotherm (DDI) at 20, 25, and 30 °C and Saturated Salt Slurry (SSS) method at 20 °C has been studied. The data acquired from these measurements for 7 models (GAB, DLP, Henderson, Chin, Smith, Oswin, Halsey) were used and statistically evaluated. Based on our collected data, the most suitable model for these types of durable meat products is the DLP model. For the DDI method, DLP model (20-30 °C) reached the R2 = 0.999, P value 3.48-4.22 of sample 1 and R2 = 0.999, P value 1.51-3.24 of sample 2. For SSS method DLP model (20 °C) reached R2 = 0.999, P value 4.23 of sample 1 and R2 = 0.998, P value 3.68 of sample 2. The most commonly used GAB model according to statistical treatment was very accurate only for the DDI method, GAB model (20-30 °C) reached R2 ≥ 0.994, P value 1.93-7.12 of sample 1 and R2 = 0.999, P value 1.76-5.54 of sample 2. In general, for DDI method for both samples have models (DLP, GAB, Halsey, Henderson, and Oswin) a P value of less than 10% for all three measured temperatures. For the SSS method, only the DLP and Henderson models are below 10% for both samples. It has been verified that the DDI method is a suitable and accurate method for measuring desorption isotherms for durable meat products.
- Publikační typ
- časopisecké články MeSH
Minoritní tuzemské druhy ovoce a prospěšné látky v nich obsažené jsou aktuálním tématem potravinářského výzkumu. Cílem této studie bylo porovnat obsah vitaminu C v meziproduktech a finálních výrobcích z černého rybízu společně s vybranými kvalitativními znaky (refraktometrická sušina, titrační kyselost). Byl analyzován soubor 13 vzorků a zjištěný obsah vitaminu C byl následující: 1020 ±78 mg/kg pro homogenát ovoce, 1102 ±31 mg/kg pro čerstvě vylisovanou šťávu, 651 ±103 mg/kg pro dřeň, 700 ±209 mg/kg pro koncentrát, 2,8 ±0,1 mg/kg pro nektar a 47,5 ±0,1 mg/kg pro džem. Nálezy vitaminu C odpovídaly způsobu a míře tepelného namáhání výrobků a byly přímo úměrné zjištěné titrační kyselosti (r = 0,871).
Minorities local types of fruit and the benefi cial substances contained in them are an actual topic of food research. The aim of study was to compare the content of vitamin C in intermediate and fi nal blackcurrant products together with selected markers (refractometric dry matter, titratable acidity). In this study, 13 samples were analysed and the vitamin C content was: 1020 ±78 mg/ kg for fruit homogenate, 1102 ±31 mg/kg for juice, 651 ±103 mg/ kg for pulp, 700 ±209 mg/kg for concentrate, 2.8 ±0.1 mg/kg for nectar and 47.5 ±0.1 mg/kg for jam. Vitamin C values corresponded to the method and extent of thermal stress of the products and were directly proportional to the titratable acidity (r = 0.871).
