Mangione G, Caccamo M, Farina G, Licitra G
Department Di3A, University of Catania, via Valdisavoia 5, 95123 Catania, Italy.
Consorzio Ricerca Filiera Lattiero-Casearia (CoRFiLaC), Regione Siciliana, 97100 Ragusa, Italy.
JDS Commun. 2022 Oct 28;4(1):5-8. doi: 10.3168/jdsc.2022-0260. eCollection 2023 Jan.
Ricotta cheese is an Italian dairy product obtained by heat-coagulation of the proteins in whey, resulting from cheese production. The homogenization method applied to collect ricotta cheese samples could affect the total solids (TS) contents of the products. The aim of this study was to determine the effects of 5 different homogenization methods of the samples collection applied for the accuracy in TS determination in ricotta cheese, including un-homogenized method (UNH), un-homogenized combined with the Ultra-Turrax (IKA-Werke GmbH & Co. KG) method (UNH-UTX), spoon-homogenized method (SPN), spoon-homogenized combined with Ultra-Turrax method (SPN-UTX), and Ultra-Turrax homogenized method (UTX). The repeatability and the standard deviation of repeatability are indicators of agreement between repeated measures for TS contents. Results reported that UNH ricotta cheese samples showed large variation in TS content with values ranging from 18.31% to 25.85% and a standard deviation of repeatability higher than 1%; SPN samples showed repeatability values higher than 0.35% and standard deviation of repeatability ranged until 1.36%, suggesting large variability even in this case; the Ultra-Turrax homogenization reported repeatability values lower than 0.1% and standard deviation of repeatability lower than 0.05%, indicating that this method provides repeatable measurements that may reduce the sources of uncertainty in TS determination.
乳清干酪是一种意大利乳制品，通过加热凝固奶酪生产过程中产生的乳清中的蛋白质而获得。用于收集乳清干酪样品的均质化方法可能会影响产品的总固体（TS）含量。本研究的目的是确定5种不同的样品收集均质化方法对乳清干酪TS测定准确性的影响，包括未均质化方法（UNH）、未均质化结合超高速均质器（IKA-Werke GmbH & Co. KG）方法（UNH-UTX）、勺子均质化方法（SPN）、勺子均质化结合超高速均质器方法（SPN-UTX）和超高速均质器均质化方法（UTX）。重复性和重复性标准偏差是TS含量重复测量之间一致性的指标。结果表明，未均质化的乳清干酪样品TS含量变化很大，值在18.31%至25.85%之间，重复性标准偏差高于1%；勺子均质化样品的重复性值高于0.35%，重复性标准偏差范围直至1.36%，表明即使在这种情况下变异性也很大；超高速均质化的重复性值低于0.1%，重复性标准偏差低于0.05%，表明该方法提供了可重复的测量结果，可能会减少TS测定中的不确定度来源。
