Microsoft Word - 37-48217 (1) 2196 Bioscience Journal Original Article Biosci. J., Uberlândia, v. 36, n. 6, p. 2196-2202, Nov./Dec. 2020 http://dx.doi.org/10.14393/BJ-v36n6a2020-48217 SENSORY ACCEPTANCE AND PHYSICO-CHEMICAL COMPOSITION OF MIXED MINAS FRESCAL CHEESE ACEITAÇÃO SENSORIAL E COMPOSIÇÃO FÍSICO-QUÍMICA DE QUEIJO MINAS FRESCAL MISTO Bruna Samara dos Santos REKOWSKY¹; Géssica Cordeiro de ARAÚJO2; Nelson de Carvalho DELFINO3; Marion Pereira da COSTA4; Thadeu Mariniello SILVA5 1. Universidade Federal da Bahia- UFBA, Programa de Pós-Graduação em Ciência Animal nos Trópicos – PPGCAT. bruna.rekowsky@hotmail.com; 2. Universidade Federal da Bahia – UFBA, Escola de Medicina Veterinária e Zootecnia – EMEVZ; 3. Programa de Pós-Graduação em Zootecnia – PPGZ, UFBA; 4. UFBA, Laboratório de Inspeção e Tecnologia de Leites e Derivados, Departamento de Medicina Veterinária Preventiva e Produção Animal; 5. UFBA, Departamento de Medicina Veterinária Preventiva e Produção Animal, Salvador, Brasil. ABSTRACT: Buffalo milk presents higher proteins and lipids concentration than cow milk, which provides a better yield in cheese-making production and products with considerable sensory approval. However, buffalo milk is not regularly available throughout the year due to different handling conditions. Thus, to guarantee the supply of buffalo milk dairy products during the year, the addition of bovine milk is an alternative. Therefore, this study aimed to test the effect of a buffalo and bovine milk mixture for the Minas Frescal cheese elaboration by physico-chemical, sensory analysis and obtaining yield. The raw material was analysed for the parameters of acidity, density, fat, total solids and solid-not-fat. There were 3 Minas Frescal cheeses elaborated from 3 formulations: 100% buffalo milk, 100% bovine milk and the mixture of 50% of each milk. The cheeses were submitted to the Gravimetric and Gerber methods to obtain values of moisture and fat, as well as to obtain, indirectly, fat in dry matter. For bovine and buffalo milk, the parameters evaluated (acidity, density, fat, total solids and solids-not-fat) complied with Brazilian legislation and parameters described in the literature. For the bovine, mixed and buffalo fresh cheeses, values were obtained, respectively, for moisture (74.04, 60.93 and 63.61), fat in dry matter (44.35, 42.23 and 46.03) and cheese yield (27, 20.8 and 24.2), indicating a higher yield for the bovine Minas Frescal cheese and higher fat content for the buffalo cheese. The overall acceptance of the mixed Minas Frescal cheese was significantly superior to the bovine and buffalo cheese. The parameters of colour, appearance, texture, flavour and overall acceptance were above 8 points in the hedonic scale (‘moderately liked’ to ‘extremely liked’), and the aroma attribute scored was above 7 (‘I enjoyed regularly’ to ‘moderately liked’). Therefore, the elaboration of Minas Frescal cheese from the mixture of 2 matrices (buffalo and bovine milk) demonstrated technological viability with the potential to meet the demands of the consumer market. KEYWORDS: Bovine milk. Buffalo milk. Dairy product. Fresh cheese. INTRODUCTION Cheese consumption influences human health as it is a food rich in lipids, proteins, minerals and vitamins, and the Minas Frescal cheese is relevant in Brazil for being one of the most consumed by the population in the country (MATERA et al., 2018). Besides that, this type of cheese has easy elaboration and high yield, which allows a fast investment at a lower cost (COSTA et al., 2013). Bovine milk presents a consolidated and lower-priced production (IBGE, 2017), which makes it the most generally used raw material for Minas Frescal cheese production. Compared to bovine milk, buffalo milk has a higher percentage of all components (fat, protein, yield), and it is particularly important to provide a higher cheese yield, resulting in improved cheese- making potential (ZICARELLI, 2004). Between 1980 and 2011, bovine milk production increased by 48%, while buffalo milk production increased by 238% (RICCI; DOMINGUES, 2012), and according to Bernardes (2018), about 85% of the production of buffalo milk is destined for the elaboration of dairy products. However, buffalo milk is not regularly available throughout the year because the concentration of calving and consequent lactation period occurs in periods of low pasture supply (SIMÕES et al., 2013), bringing losses to dairy production of this species. Due to the seasonality of buffalo milk production, mixing it with bovine milk Received: 01/05/2019 Accepted: 30/01/2020 2197 Sensory acceptance… REKOWSKY, B. S. S. et al. Biosci. J., Uberlândia, v. 36, n. 6, p. 2196-2202, Nov./Dec. 2020 http://dx.doi.org/10.14393/BJ-v36n6a2020-48217 is an alternative to guarantee the offer of buffalo milk dairy products throughout the year. Few studies have evaluated the potential of dairy products made from the mixture of buffalo and cow's milk, associating the physico-chemical and yield data with the sensory acceptance of these mixed cheeses (CARDOSO et al., 2019; SIMÕES et al., 2013). Therefore, this study aimed to evaluate the potential of the mixture of milk matrices (buffalo and bovine) for technological processing innovation of Minas Frescal cheese based on physico-chemical data, yield performance and sensorial acceptance of the new product elaborated. MATERIAL AND METHODS Obtaining the raw material There were 10 litres obtained of each milk (buffalo and bovine milk) from the Fazenda Experimental de Entre Rios of the Universidade Federal da Bahia (UFBA). The raw material was obtained by mechanical milking and cooled to 4ºC. For transportation, the milk was packed in bottles of 05 litres kept in a thermal box, and, at the laboratory, it was kept in refrigeration until the analysis of the samples and preparation of the cheeses. Both milk samples were evaluated for acidity, density, fat, total solids and solids-not-fat according to the AOAC (2012). The Minas Frescal cheeses were prepared at the Laboratorio de Inspeçao e Tecnologia de Leite e Derivados (LaITLacteos) located at the Escola de Medicina Veterinária e Zootecnia (UFBA). Elaboration of the Minas Frescal cheeses and physicochemical analysis There were three cheese treatments performed: (CBO) 100% bovine milk, (CBB) Mixture 50% bovine milk + 50% buffalo milk and (CBU) 100% buffalo milk. The cheese manufacturing procedures followed the steps described by Verruck et al. (2015), using, as ingredients, calcium chloride (0.02%), cultures provided by natural skim yogurt (1.8%; Nestlé), sodium chloride (0.8%; Sal Lebre) and liquid coagulant (CHY-MAX®). The milk samples were pasteurized (65°C for 30 minutes) and then cooled to 35ºC. After that, the lactic culture was added, followed by the addition of calcium chloride and liquid coagulant according to the manufacturer's instructions. The sodium chloride was added during the agitation step to incorporate into the mass. Plastic moulds with a cylindrical shape and with holes in the bottom, which allowed the serum to be drained, were used for placing the cheese mass that was left in the oven for 30 minutes. After the production, the cheeses were kept refrigerated at 4 ± 1°C for approximately 24 hours until the physico-chemical and sensorial analysis. Following the classification requirements for Minas Frescal cheese (BRASIL, 2004), samples were collected for physico-chemical characterisation, including moisture by the gravimetric method and fat by the Gerber butyrometer method according to the AOAC (2012). The fat was calculated in dry matter (g/100 g), and the cheese yield (CY%) was calculated according to El-Gawad and Ahmed (2011). Sensory evaluation of cheeses The test sessions were performed in 1 day. There were 100 participants (70 women, 30 men), ranging from 19 to 58 years-old, recruited at the Universidade Federal da Bahia. The test was performed in a laboratory under controlled conditions of light, temperature and sound. The exclusion criterion was people with allergies or intolerance to dairy products. The participants evaluated colour appearance, aroma, flavour, texture and overall acceptability of each sample based on a 9-point hedonic scale (9 = liked extremely; 5= neither liked nor disliked, and 1= disliked extremely). Statistical analysis All data were submitted to analysis of variance, followed by the Tukey test when significant (Except the physico-chemical analysis of milk), using the PROC GLM of SAS 9.1 program (SAS Inst. Inc., Cary, NC). Significance was declared at P-values <0.05. RESULTS AND DISCUSSION Physico-chemical characterisation of the raw material The fat content and total solids of buffalo milk were slightly higher (P <0.05) than those of bovine milk (Table 1) but there were no significant differences between the other parameters evaluated (P >0.05). The buffering capacity (capacity of acidification) is higher in buffalo milk than in cow's milk (AHMAD et al., 2008), which may justify the difference of acidity between the 2 matrices, and, nevertheless, the results of density and acidity are in accordance with legislation (BRASIL, 2018). 2198 Sensory acceptance… REKOWSKY, B. S. S. et al. Biosci. J., Uberlândia, v. 36, n. 6, p. 2196-2202, Nov./Dec. 2020 http://dx.doi.org/10.14393/BJ-v36n6a2020-48217 Table 1. Physico-chemical analysis of the raw material for Minas Frescal cheeses preparation. Parameters Species P-Value¹ Reference² Reference3 Bovine Buffalo Total Solids (%) 13.31 ± 0.54 14.54 ± 0.46 0.040 Min. 11.4 12.60 to 15.90 Solids-not-fat (%) 9.54 ± 0.09 9.97 ± 0.45 0.184 Min. 8.4 8.28 to 9.40 Fat (%) 3.77 ± 0.45 4.57 ± 0.21 0.049 Min. 3.0 4.0 to 6.5 Density (g/mL) 1.034 ± 0.0 1.035 ± 0.002 0.374 1.028 to 1.034 - Acidity (Dº) 18.0 ± 1.73 16.0 ± 0.0 0.116 14 to 18 11.0 to 18.0 ¹ Different means on the same line differ by significance at P-value <0.05. ² According to Brazilian regulations for bovine milk (BRASIL, 2018). 3 Values reported in the literature buffalo milk (AHMAD et al., 2013; KANWAL; AHMED; MIRZA, 2004; MURTAZA et al., 2013). The observed data corroborate the findings of other authors that indicate that total solids and total solids decreased, respectively, 14.04% and 8.79% for buffaloes and 13.73% and 9.17% for bovines (KANWAL; AHMED; MIRZA, 2004). Several studies present data about the buffalo milk composition, such as protein (3.81 to 4.8), fat content (4.0 to 8.54), lactose (4.68 to 4.99), minerals (0.79 to 0.88) and total solids (12.60 to 18.96), and these components are strongly connected to the formation of the curd (CIPOLAT-GOTET et al., 2015; MELO et al., 2018; HAN et al., 2007; MURTAZA et al., 2013;). Cheese yield and physico-chemical characterisation of cheeses The cheese yield (CY%) of the bovine Minas Frescal cheese was higher than that of the other elaborated varieties and was less in the mixed cheese production (Table 2). This high yield for the bovine cheese can be explained by the higher percentage of moisture (P <0.05) when compared with other treatments. According to the legislation for Minas Frescal cheese, which was considered a ‘very high humidity’ cheese and must have values above 55% for moisture (BRASIL, 2004). Table 2. Physicochemical analysis of Minas Frescal cheese made with bovine, buffalo and mixed milk. Parameters Physico-chemical analysis CBO CBB CBU P- Value 2 Cheese yield (%) 27.00 20.80 24.20 - Moisture (%) 73.0 a ± 1.20 60.0b ± 1.5 64.0b ± 1.0 0.0013 Dry matter (%) 27.1 c ± 1.20 39.1ª ± 1.59 35.5b ± 0,84 <0.0001 Fat (%) 11.5 b ± 0.50 15.0a ± 1.04 16.8ª ± 0.52 0.0004 Fat in dry matter (%) 42.2ab ± 1.93 40.2b ± 2.63 46.1ª ± 1.05 0.0147 CBO = cheese made from 100% bovine milk; CBB = Cheese made from 50% bovine milk and 50% buffalo milk and CBU = cheese made from 100% buffalo milk. ² Different means on the same line differ by Tukey's test with P <0.05. Wide variation in the moisture content of bovine Minas Frescal (50.07 to 74.49) was also observed in artisanal and industrialised cheeses in Brazil (DIAS et al., 2016; MAGENIS et al., 2014). The syneresis (loss of whey) depends on factors such as the amount of protein and calcium and pH reduction and directly influences the moisture content of the cheese (PAULA; CARVALHO; FURTADO, 2009). Considering that buffalo milk has higher amounts of protein and calcium (HUMA et al., 2018), associated with the fact that casein micelles are larger in this milk matrix, it tends to cause faster and more efficient coagulation when compared to cow's milk, with less moisture retention (KHEDKAR; KALYANKAR; DEOSARKAR, 2016). Thus, cow's milk would probably need more time to complete the syneresis process. Despite the lower amount of fat (P <0.05) in CBO cheese, the fat/fat in the dry matter ratio for this treatment is favoured due to the higher moisture content and, consequently, lower dry matter content. The amount of fat in dry matter (FDM) was 2199 Sensory acceptance… REKOWSKY, B. S. S. et al. Biosci. J., Uberlândia, v. 36, n. 6, p. 2196-2202, Nov./Dec. 2020 http://dx.doi.org/10.14393/BJ-v36n6a2020-48217 observed in greater quantities for CBU cheese (P <0.05) when compared with CBB, but there was not a significant difference (P >0.05) when compared with the CBO treatment. The addition of bovine milk resulted in a decrease in the percentage of mixed cheese FDM in comparison to buffalo cheese (SIMÕES et al., 2013), and in accordance with the legislation, both CBO and CBB were considered semi-fat cheeses (FDM between 25.0 to 44.9%) while the CBU treatment was classified as a fat cheese (BRASIL, 1996). In Minas Frescal cheeses marketed in the country, the fat content (8.08% to 25.57%) and FDM (23.12% to 52.47%) show great variation (MAGENIS et al., 2014); therefore, there is an absence of standardisation of the raw material and technological processing of this type of dairy derivative, which becomes a challenge concerning quality control (SOUZA et al., 2019). The yield of the bovine Minas Frescal cheese was 3.7 litres of milk for each 1 kg of the product, while the yield of the fresh buffalo cheese was 4.1 litres of milk per kilo of cheese produced, corroborating Moraes et al. (2006), who needed 4.7 litres of buffalo milk per kilo of Minas Frescal cheese. The mixed Minas Frescal CY% was 4.8 kg of milk/kg of product, and, although it was inferior to the other treatments, it is still similar to the other Minas Frescal cheese from buffalo as well as from bovine milk (ANTUNES et al., 2017; YUNES; BENEDET, 2000). These results demonstrate the need for further studies about the effect of a mixture of milk of different species on fresh cheese yield. Sensory analysis According to the average score obtained through the hedonic scale (1 to 9), it was observed that most of the parameters of Minas Frescal mixed cheese presented above 8.0 points, with a rating of ‘liked moderately’ to ‘liked extremely’, which makes their approval evident, both for the overall acceptance and for the other evaluated attributes. In addition, the score obtained by the mixed cheese was higher or equal in all attributes when compared to fresh cheeses from bovine and buffalo milks (Table 3). Table 3. Sensory analysis of Minas Frescal cheeses. Parameters1 Minas Frescal Cheese P-Value CBO CBB CBU Colour 7.97b 8.33a 8.16ab <0.001 Appearance 7.42b 8.35a 8.05a <0.001 Aroma 7.39b 7.85a 7.68ab 0.010 Texture 7.06b 8.23a 8.13a <0.001 Flavour 7.85ab 8.06a 7.45b 0.003 Overall acceptance 7.50b 8.11a 7.59b <0.001 CBO = cheese made from 100% bovine milk; CBB =Cheese made from 50% bovine milk and 50% buffalo milk and CBU = cheese made from 100% buffalo milk. 1Values punctuated in hedonic scale from 1 to 9. Different means in the same line differ among themselves by the Tukey test with P <0.05. The colour evaluation of CBU did not vary significantly (P >0.05) when compared to the CBB treatment but was superior to that of the bovine fresh cheese (P <0.05). According to Simões et al. (2013), the colour and appearance of Marajó cream cheese varied due to the addition of bovine milk, so the brightness and green colour of the buffalo milk was reduced, and yellow colouration was noticed with the addition of bovine milk. Therefore, it can be assumed that the yellowish colouration of bovine milk was a positive factor compared to the visual evaluation of the taster, causing a better score for the mixed cheese in this question and it. This fact was also observed by Cardoso et al. (2019) who presented superior colour scores for mixed soft cheese in comparison to those made with only bovine or buffalo milk. The interaction of volatile components of fatty acids influences the flavour and aroma of the Minas Frescal cheese, conferring a mild and pleasant flavour and low aromatic thresholds (NOGUEIRA; LUBACHEVSKY; RANKIN, 2005). Although CBU presented higher fat in dry matter, the buffering capacity (slow acidification), lower retention of moisture and increased time for lipolysis and proteolyzes can negatively influence the sensory profile of buffalo dairy (KHEDKAR; KALYANKAR; DEOSARKAR, 2016). So, it is possible to perceive that the flavour attribute was enhanced by the presence of bovine milk once CBO received higher values when compared with CBU 2200 Sensory acceptance… REKOWSKY, B. S. S. et al. Biosci. J., Uberlândia, v. 36, n. 6, p. 2196-2202, Nov./Dec. 2020 http://dx.doi.org/10.14393/BJ-v36n6a2020-48217 (P<0.05). On the other hand, buffalo milk contributed to improve the sensory texture since CBU cheeses received higher scores (P <0.05) than the CBO. The overall acceptance of the CBB cheese was significantly higher (P <0.05) than that of both bovine and buffalo Minas Frescal cheeses. The results of the sensorial analysis indicate that the CBB treatment obtained the highest average score for all the evaluated attributes and presented a satisfactory cheese yield. So, it is possible to infer that dairy products developed from the mixture milk of different species may eventually outperform the sensory qualities of milk matrix products of a single species. CONCLUSION The Minas Frescal cheese was considered a ‘very high humidity cheese’ (60.0%) and a ‘semi- fat’ (40.2%) cheese, conforming to the legislation. All parameters, except for aroma, were rated as ‘liked moderately’ to ‘liked extremely’, with scores above 8.0. Because of the sensory approval obtained by the Minas Frescal cheese elaborated from the mixture of buffalo and bovine milks, added to its physico-chemical properties and satisfactory production yield, we can conclude that mixed Minas Frescal cheese presents technological potential for the dairy industry and can play a role in the valorisation of the production chain of buffalo dairy in the country. ACKNOWLEDGEMENTS The authors thanks the Fazenda Experimental de Entre Rios of the Universidade Federal da Bahia (UFBA) for providing the bovine and buffalo milks and thanks the Conselho Nacional de Desenvolvimento Científico e Tecnológico (process no. 405728/2018-2 and 402430/2018-2, CNPq, Brazil) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) for their financial suport. RESUMO: O leite de búfala possui maior porcentagem de todos os componentes tornando-o uma matéria-prima adequada com potencial para fornecer um maior rendimento e qualidade nutricional na produção de queijo. No entanto, o leite de búfalo não está disponível regularmente ao longo do ano devido a diferentes condições de manejo. Assim, para garantir a oferta de produtos lácteos com leite de búfala independentemente da época, a adição de leite bovino pode ser vista como uma alternativa. Logo, este trabalho teve como objetivo testar o efeito da mistura do leite de búfalo e bovino na elaboração do queijo Minas Frescal por meio de análises físico-químicas e sensoriais e obtenção do rendimento economico. A matéria-prima foi analisada quanto aos parâmetros: acidez titulável, densidade, gordura, sólidos totais e sólidos totais desengordurados. Três variedades de queijo Minas Frescal foram elaboradas a partir de três formulações: 100% de leite de búfala, 100% de leite bovino e da mistura de 50% de cada leite. Os queijos foram submetidos aos métodos Gavimetric e Gerber para obtenção de umidade e gordura, bem como, indiretamente, para obtenção de matéria gorda no extrato seco. Para o leite bovino e de búfala, os parâmetros avaliados (acidez titulável, densidade, gordura, sólidos totais e sólidos totais desengordurados) estavam de acordo com a legislação brasileira e parâmetros descritos na literatura. Para os queijos bovino, misto e de búfala, foram obtidos, respectivamente, para: umidade (74,04; 60,93 e 63,61), gordura na matéria seca (44,35; 42,23 e 46,03) e rendimento econômico (27, 20,8 e 24,2) indicando maior rendimento o queijo Minas Frescal bovino e maior teor de gordura para o queijo búfalo. A aceitação global do queijo Minas Frescal misto foi significativamente superior ao do queijo bovino e bubalino. Os parâmetros de cor, aparência, textura, sabor e aceitabilidade global foram acima de 8 pontos (entre "gostei moderadamente" e "extremamente gostei") e o atributo aroma obteve pontuação acima de 7 ("gostei regularmente" para "gostei moderadamente"). Portanto, a elaboração do queijo Minas Frescal da mistura de leite bovino ao búfalo demonstrou potencial para atender as demandas do mercado consumidor. PALAVRAS-CHAVE: Derivado lácteo. Leite de vaca. Leite de búfala. Queijo fresco. REFERENCES AHMAD, S.; ANJUM, F. M.; HUMA, N.; SAMEEN, A.; ZAHOOR, T. 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