ABSTRACT:
There are no specific technical regulations regarding the identity and quality of white mold surface-ripened cheeses in Brazil. These cheeses are sold both whole (Camembert-type) and in wedges (Brie-type). The aim of the study was to evaluate the physical and chemical properties; technological parameters and microbiological safety of 20 whole cheeses (Camembert-type) and 16 cheese wedges (Brie-type) produced in Brazil. Samples showed a wide range in sodium (91.0-731.0 mg/100 g, cheeses wedges) and calcium (238.0-1100.0 mg/100g, whole cheeses) contents. The cheese groups presented no significant differences in relation to the majority of the analyzed parameters. Listeria monocytogenes was reported in 5% of the whole cheese samples. The other microbiological parameters were in accordance with the current legislation, RDC no 12/2001 of Anvisa. The comparative assessments between these two cheeses indicated that they are different. In addition, the wide range of results indicated a lack of processing standardization. The mean values of the physicochemical and textural parameters should be considered as recommended for these cheeses in Brazil.
Key words:
cheese quality; chemometrics; Camembert-type cheese; Brie-type cheese
RESUMO:
No Brasil, não há uma regulamentação técnica específica sobre a identidade e qualidade de queijos maturados com mofo branco na superfície. Estes queijos são comercializados inteiros (tipo Camembert) e em cunhas (tipo Brie). O objetivo da pesquisa foi avaliar as propriedades físicas e químicas; parâmetros tecnológicos e marcadores microbiológicos de 20 queijos inteiros (tipo Camembert) e 16 cunhas de queijo (tipo Brie) produzidos no Brasil. Os teores de sódio e cálcio apresentaram elevada amplitude (8,0 e 4,6 vezes o valor mínimo, respectivamente). Os valores médios destes queijos não apresentaram diferenças significativas em relação à maioria dos parâmetros analisados. Listeria monocytogenes foi encontrada em 5% das amostras de queijo tipo Camembert. Os demais parâmetros microbiológicos estavam de acordo com a legislação vigente, RDC no 12/2001 da Anvisa. Esta avaliação comparativa entre estes dois queijos indica que são diferentes. Além disso, os valores com elevada amplitude correspondem a falta de padronização do processamento. Os valores médios poderiam ser considerados como recomendados para estes queijos no Brasil.
Palavras-chave:
qualidade de queijo; quimiometria; queijo tipo-Camembert; queijo tipo-Brie
INTRODUCTION:
The production of white mold surface-ripened cheeses in Brazil started around the 1930s in the state of Minas Gerais, which is considered to be the first time that this class of cheese was produced in the southern hemisphere. In 2017 the production of these cheeses in Brazil was 3,289 tons (72% and 28% of Brie and Camembert-type, respectively), which was produced by fourteen companies (BRASIL, 2018). These cheeses are frequently consumed at home or in restaurants in colder regions of southern Brazil, with friends or at social gatherings, and usually with wine (JUDACEWSKI et al., 2019JUDACEWSKI, P. et al. Perceptions of Brazilian consumers regarding white mould surface-ripened cheese using free word association. International Journal of Dairy Technology, v.72, n.4, p.585-590, 2019. Available from: . Accessed: Oct. 10, 2019. doi: 10.1111/1471-0307.12649.
https://doi.org/10.1111/1471-0307.12649...
). The largest producer of this class of cheese worldwide is France, with 263,000 tons made from bovine milk. It is estimated that this class of cheese represents 2-3% of cheese production worldwide (SPINNLER, 2017SPINNLER, H. -E. Surface mold-ripened cheeses. In: MCSWEENEY, P.L.H.; FOX, P.F.; PAUL, D.; COTTER, P.D.; EVERETT, D.W. (Eds). Cheese: chemistry, physics and microbiology, 4th ed., pp.911-928. London: Academic Press, 2017.).
These cheeses are coated with Penicillium camemberti or P. candidum mycelium and they have a velvety white surface. This mold is responsible for promoting the characteristic appearance, taste and aroma of the cheese (BATTY el al., 2019BATTY, D. et al. Influence of cheese-making recipes on the composition and characteristics of Camembert-type cheese. Journal of Dairy Science, v.102, n.1, p.164-172, 2019. Available from: <Available from: https://doi.org/10.3168/jds.2018-14964
>. Accessed: Feb. 10, 2019. doi: 10.3168/jds.2018-14964.
https://doi.org/10.3168/jds.2018-14964...
; SPINNLER, 2017SPINNLER, H. -E. Surface mold-ripened cheeses. In: MCSWEENEY, P.L.H.; FOX, P.F.; PAUL, D.; COTTER, P.D.; EVERETT, D.W. (Eds). Cheese: chemistry, physics and microbiology, 4th ed., pp.911-928. London: Academic Press, 2017.). Brazilian white mold surface-ripened cheeses have significant differences when compared to the French original versions of such cheeses. These differences include the following: (1) Brazilian cheese is produced using milk from different breeds of dairy cows (mainly Holstein and Jersey) with distinct animal feeding and climatic conditions; (2) commercialization occurs at 2-3 weeks of ripening (fresh to partially ripened) due to the low sensorial perception of bitterness and residual ammonia (factors which are unpalatable for the majority of Brazilian consumers) at that stage; (3) Brazilian cheese may contain less moisture and be harder in order to maintain its structure in the higher temperatures of a tropical climate; and (4) there is no specific Brazilian legislation regarding the quality standards for white mold surface-ripened cheeses (LECLERCQ-PERLAT, 2011LECLERCQ-PERLAT, M. N. Cheese: camembert, brie, and related varieties. In: FUQUAY, J.W.; MCSWEENEY, P.L.H.; FOX, P.F. (Eds). Encyclopedia of Dairy Sciences, 2n
d ed., pp. 773-782. Mississipi: Elsevier, 2011, 4170p.; FRANCE, 2013FRANCE. Décret n° 2013-1059 du 22 novembre 2013, JORF du 24 novembre 2013. Relatif à cahier des charges de l’appellation d’origine “Camembert de Normandie”. Bulletin officiel du Ministère de l’agriculture, de l’agroalimentaire et de la forêt, n°48-2013, 15p. Available from: <Available from: https://www.legifrance.gouv.fr/affichTexte.do?cidTexte=JORFTEXT000028225105&categorieLien=id
>. Accessed: Oct. 10, 2019.
https://www.legifrance.gouv.fr/affichTex...
; GALLI et al., 2016GALLI, B. D. et al. Sensory quality of Camembert-type cheese: relationship between starter cultures and ripening molds. International Journal of Food Microbiology, v.234, p.71-75, 2016. Available from: <Available from: https://doi.org/10.1016/j.ijfoodmicro.2016.06.025
>. Accessed: Oct. 10, 2018. doi: 10.1016/j.ijfoodmicro.2016.06.025.
https://doi.org/10.1016/j.ijfoodmicro.20...
; JUDACEWSKI et al., 2016JUDACEWSKI, P. et al. Quality assessment of white mold-ripened cheeses manufactured with different lactic cultures. Journal of the Science of Food and Agriculture, v.96, p.3831-3837, 2016. Available from: <Available from: https://doi.org/10.1002/jsfa.7577
>. Accessed: Oct. 20, 2018. doi: 10.1002/jsfa.7577.
https://doi.org/10.1002/jsfa.7577...
, FRANCE, 2018FRANCE. Homologué par l’arrêté du 29/08/2018, JORF du 05/09/2018. Relatif à cahier des charges de l’appellation d’origine « BRIE DE MEAUX » Bulletin officiel du Ministère de l’agriculture et de l’alimentation, n°2018-37, 13p. Available from: <Available from: https://www.legifrance.gouv.fr/affichTexte.do?cidTexte=JORFTEXT000037365623&categorieLien=id
>. Accessed: Oct. 10, 2019.
https://www.legifrance.gouv.fr/affichTex...
).
Brazilian cheeses with white mold on the surface were not previously characterized with respect to their physical, chemical and microbiological attributes. This information could be used directly by the cheese-making industry in order to establish processing standards, and by inspection authorities to establish quality and identity standards. Thus, the aim of the present study was to evaluate the physical and chemical properties, texture profile and microbiological safety of white mold surface-ripened cheeses produced in Brazil.
MATERIALS AND METHODS:
Materials
Samples of whole (n = 20, Camembert-type cheeses) and wedges (n = 16, Brie-type cheeses) of white mold surface-ripened cheeses were collected in different regions of Brazil. These samples represent 80% of this class of cheese produced in the country. All the samples were produced by establishments inspected by the Federal Inspection Service (SIF) regulated by the Ministry of Agriculture, Livestock and Food Supply (MAPA). The cheese samples were collected by MAPA inspectors and forwarded by refrigerated mail to the State University of Ponta Grossa (UEPG, Paraná, Brazil) and were subsequently refrigerated (5 to 7 °C) until further analysis (BRASIL, 2017BRASIL. Ministério da Agricultura, Pecuária e Abastecimento (MAPA). Decreto nº 9.013, de 29 de março de 2017.2017 Available from: <Available from: http://www.planalto.gov.br/ccivil_03/_Ato2015-2018/2017/Decreto/D9013.htm
>. Accessed: May, 25, 2018.
http://www.planalto.gov.br/ccivil_03/_At...
).
Methods
Label specifications, dimensions and analytical procedure
The weight (g), diameter (mm) and height (mm) of all the samples were determined. The price of the cheese per kg was expressed in US dollars. The colorimetric analysis and texture profile were then analyzed. The samples were subsequently crushed in a food processor (Philips Walita, model RI 7620, Brazil) homogenized and analyzed for their physicochemical and microbiological parameters. All the analyses were performed in triplicate.
Color measurement
The instrumental color of the samples was analyzed by reflectance using a MiniScan EZ colorimeter (HunterLab, Reston, Virginia, USA). The cheese samples were divided into four quadrants, including the two surfaces (top and bottom). The L
*, a
* and b
* values were recorded. The whiteness Index (WI) of the surface of the cheeses was calculated according to JUDACEWSKI et al. (2016JUDACEWSKI, P. et al. Quality assessment of white mold-ripened cheeses manufactured with different lactic cultures. Journal of the Science of Food and Agriculture, v.96, p.3831-3837, 2016. Available from: <Available from: https://doi.org/10.1002/jsfa.7577
>. Accessed: Oct. 20, 2018. doi: 10.1002/jsfa.7577.
https://doi.org/10.1002/jsfa.7577...
).
Texture profile analysis (TPA)
The TPA was performed instrumentally with a TA.XTplus texture analyzer (Stable Micro Systems® texturometer, Godalming, UK) with a 5,000 g load cell. The cheeses were cut into cylinders with 20 mm diameter and 20 mm height (JASTER et al., 2019JASTER, H. et al. Quality assessment of the manufacture of new ripened soft cheese by Geotrichum candidum: physico-chemical and technological properties. Food Science and Technology, v.39, n.1, p.50-58, 2019. Available from: <Available from: http://dx.doi.org/10.1590/fst.25717
>. Accessed: Mar. 19, 2019. doi: 10.1590/fst.25717.
http://dx.doi.org/10.1590/fst.25717...
). The test speed was 0.8 mm/s with dual compression, which was 30% of the initial height of the sample, using an aluminum cylindrical probe of 36 mm diameter, at 25 °C, in accordance with MARINHO et al. (2015MARINHO, M. T. et al. Ripened semihard cheese covered with lard and dehydrated rosemary (Rosmarinus officinalis L.) leaves: processing, characterization, and quality traits. Journal of Food Science, v.80, n.9, S2045-S2054, 2015. Available from: <Available from: https://doi.org/10.1111/1750-3841.12988
>. Accessed: Oct. 29, 2018. doi: 10.1111/1750-3841.12988.
https://doi.org/10.1111/1750-3841.12988...
). The parameters of hardness (N), cohesiveness, chewiness (N.s) and resilience were analyzed using Exponent Lite 6.1.4.0 software for Windows. The analyses were carried out in six replicates per sample.
Physicochemical analysis
The determination of moisture was carried out gravimetrically after drying the samples in an oven at 105 ºC up to constant weight. The determination of pH (pH 21 meter, Hanna, Cotia, Brazil), acidity, lactose, lipid content and total nitrogen (Kjeldahl method), converted to protein with a conversion factor of 6.38, were made according to the AOAC (2016). Association of Official Analytical Chemists International - AOAC. Official Methods of Analysis of the Association of Official Analytical Chemistry. 20th ed. Washington: AOAC International, 2016.The dry extract was determined by the difference in moisture content subtracted from 100, and the non-fat dry extract (NDE) was determined by the difference between the dry extract and lipids content. The ash content was determined by incineration in a muffle furnace (2310, Fornos Jung Ltda, Blumenau, Brazil) at 550 ºC for 6 h (IAL, 2008IAL - Instituto Adolfo Lutz. Methods for physical and chemical analysis of foods, 4th ed., Brasília: Ministério da Saúde, Agência Nacional de Vigilância Sanitária, 2008. Available from: <Available from: http://www.ial.sp.gov.br/ial/publicacoes/livros/metodos-fisico-quimicos-para-analise-de-alimentos
>. Accessed: Feb. 15, 2018.
http://www.ial.sp.gov.br/ial/publicacoes...
). The sodium content was determined using the method of Volhard modified by MARGOLIES & BARBANO (2018MARGOLIES, B. J.; BARBANO, D. M. Determination of fat, protein, moisture, and salt content of Cheddar cheese using mid-infrared transmittance spectroscopy. Journal of Dairy Science, v.101, n.2, p.924-933, 2018. Available from: <Available from: https://doi.org/10.3168/jds.2017-13431
>. Accessed: Oct. 29, 2018. doi: 10.3168/jds.2017-13431.
https://doi.org/10.3168/jds.2017-13431...
). The calcium level was evaluated by complexometric titration with EDTA (IAL, 2008IAL - Instituto Adolfo Lutz. Methods for physical and chemical analysis of foods, 4th ed., Brasília: Ministério da Saúde, Agência Nacional de Vigilância Sanitária, 2008. Available from: <Available from: http://www.ial.sp.gov.br/ial/publicacoes/livros/metodos-fisico-quimicos-para-analise-de-alimentos
>. Accessed: Feb. 15, 2018.
http://www.ial.sp.gov.br/ial/publicacoes...
).
Microbiological analysis
A quantity of 25 g of cheese was mixed with 225 mL of 2% sterile peptone water and then homogenized in a stomacher (Stomacher Homogenizer 130, Ethik technology, São Paulo, Brazil) for one minute. Decimal dilutions were made, followed by plating in duplicate for each dilution. Listeria monocytogenes and Salmonella spp. were studied using the conventional procedures described by WEHR & FRANK (2004WEHR, H. M.; FRANK, J. F. Standard methods for the examination of dairy products, 17th ed., Whashigton: American Public Health Association, 2004, 570); results were expressed by the presence or absence of the pathogens in 25 g of sample. The coagulase-positive Staphylococcus (CPS) were enumerated using Baird-Parker agar (Oxoid), incubated at 35 ºC for 48 h, followed by catalase, coagulase, and thermonuclease tests of typical and atypical colonies. The most probable number (MPN) of thermotolerant coliforms at 45 ºC was determined following the methodology of the American Public Health Association (WEHR & FRANK, 2004WEHR, H. M.; FRANK, J. F. Standard methods for the examination of dairy products, 17th ed., Whashigton: American Public Health Association, 2004, 570).
Statistical analysis
The experimental data were presented as mean ± standard deviation (SD) and as minimum and maximum values. Firstly, the samples had their normality checked (Shapiro-Wilk’s test), and the differences between the samples associated in groups (whole and cheeses wedges) were assessed using Student’s t-test. The data were also submitted to principal component analysis (PCA) in order to explore their structure and to look for associations between the variables and the samples. For this purpose, all the variables were firstly auto scaled to standardize the statistical importance of all the responses. A 2D scatter plot was then used to distinguish the differences between the samples obtained by the PCA results. All the statistical analyses were performed using Statistica 13.3 software (TIBCO Software Inc., Palo Alto, CA, USA).
RESULTS AND DISCUSSION:
The samples were divided into whole cheeses (Camembert-type) and cheese wedges (Brie-type). These two types of cheese currently have values between US$ 16-27.0/kg (Table 1) and a short ripening period (10-21 days).
The dimensions of the samples of both cheeses presented significant difference (p<0.05) and high variability (33 and 51% for the height and weight of whole cheeses, respectively). The whole cheese presented a cylindrical shape with mean weight (190 g), diameter (8.9 cm) and height (3.2 cm). The wedges of cheese weighed 60-178 g and mean diameter (12.5 cm) and mean weight (750 g) of the cheeses presented high variability (Table 1).
The moisture content for both cheeses ranged from medium (36-45.9%) to high (46-54.9%) (Table 1). These values were lower than those reported by LECLERCQ-PERLAT (2011LECLERCQ-PERLAT, M. N. Cheese: camembert, brie, and related varieties. In: FUQUAY, J.W.; MCSWEENEY, P.L.H.; FOX, P.F. (Eds). Encyclopedia of Dairy Sciences, 2n
d ed., pp. 773-782. Mississipi: Elsevier, 2011, 4170p.) for French white mold cheeses (50-60%). The causes of these variations and the lower moisture content in relation to French cheeses may be due to different humidity and temperatures used in the ripening process; lack of efficient control of humidity and design of maturation chambers (LECLERCQ-PERLAT et al., 2015LECLERCQ-PERLAT, M.-N. et al. Temperature and relative humidity influence the ripening descriptors of Camembert-type cheeses throughout ripening. Journal of Dairy Science, v.98, p.1325-1335, 2015. Available from: <Available from: https://doi.org/10.3168/jds.2014-8916
>. Accessed: Oct. 30, 2018. doi: 10.3168/jds.2014-8916.
https://doi.org/10.3168/jds.2014-8916...
; JUDACEWSKI et al., 2016JUDACEWSKI, P. et al. Quality assessment of white mold-ripened cheeses manufactured with different lactic cultures. Journal of the Science of Food and Agriculture, v.96, p.3831-3837, 2016. Available from: <Available from: https://doi.org/10.1002/jsfa.7577
>. Accessed: Oct. 20, 2018. doi: 10.1002/jsfa.7577.
https://doi.org/10.1002/jsfa.7577...
) .
The pH values showed significant difference (p<0.05). The values for the fresh cheeses were < 5.5 and for well-ripened cheeses they were > 6.5 (ABRAHAM et al., 2007ABRAHAM, S. et al. Eh and pH gradients in Camembert cheese during ripening: Measurements using microelectrodes and correlations with texture. International Dairy Journal, v.17, p.954-960, 2007. Available from: <Available from: https://doi.org/10.1016/j.idairyj.2006.12.010
>. Accessed: Nov. 20, 2018. doi: 10.1016/j.idairyj.2006.12.010.
https://doi.org/10.1016/j.idairyj.2006.1...
). The variations in the lactose and acidity content confirmed this information (Table 1). The pH of bovine milk is 6.6-6.8 and with lactic fermentation it decreases to 4.6 and 4.8 (when taken from the mold). P. candidum consumes lactic acid for growth, de-acidifying the surface of the cheese and promoting a migration of lactate from the interior to the exterior of the cheese (ABRAHAM et al., 2007). Thus, the external pH (rind) can be around 7.0 and the internal (mass) around 6.0 at the end of the ripening period (5-6 weeks) (SPINNLER, 2017SPINNLER, H. -E. Surface mold-ripened cheeses. In: MCSWEENEY, P.L.H.; FOX, P.F.; PAUL, D.; COTTER, P.D.; EVERETT, D.W. (Eds). Cheese: chemistry, physics and microbiology, 4th ed., pp.911-928. London: Academic Press, 2017.).
All the samples of both cheeses were classified as soft (moisture on a fat-free basis (MFFB) > 67%) and high-fat (fat on a dry basis (FDB) > 60%) (BYLUND, 2015BYLUND, G. Dairy Processing Handbook. Sweden: Tetra Pak Processing Systems AB, 2015.), which are typical features of Camembert-type and Brie-type cheeses (LECLERCQ-PERLAT, 2011LECLERCQ-PERLAT, M. N. Cheese: camembert, brie, and related varieties. In: FUQUAY, J.W.; MCSWEENEY, P.L.H.; FOX, P.F. (Eds). Encyclopedia of Dairy Sciences, 2n
d ed., pp. 773-782. Mississipi: Elsevier, 2011, 4170p.). The high lipid (> 60 g/100 g) content may have been due to the addition of cream to the milk. In some cases, lipids are added in the processing, modifying not only the lipid content in the cheese, but also attributing sensorial characteristics such as flavor, aroma and texture (PHADUNGATH, 2005PHADUNGATH, C. Cream cheese products: a review. Songklanakarin Journal of Science and Technology, v.27, p.191-199, 2005. Available from: <Available from: https://rdo.psu.ac.th/sjstweb/journal/27-1/18cream-cheese.pdf
>. Accessed: Oct. 29, 2018.
https://rdo.psu.ac.th/sjstweb/journal/27...
). These cheeses with added lipids have less syneresis and melt at higher ambient temperatures (>20 oC).
The minimum, average and maximum protein contents for both cheeses were similar (Table 1). The protein contents showed a high variability (13.0-22.5 g/100 g). Similar results (13.71-19.76 g/100 g) were reported by VOIGT et al. (2011VOIGT, D. D. et al. Effect of high-pressure treatment of milk prior to manufacture on ripening of Camembert cheese. Innovative Food Science and Emerging Technologies, v.12, p.1-5, 2011. Available from: <Available from: https://doi.org/10.1016/j.ifset.2010.12.001
>. Accessed: Sep. 18, 2018. doi: 10.1016/j.ifset.2010.12.001.
https://doi.org/10.1016/j.ifset.2010.12....
) in Camembert-type cheese. This variability may have been due to factors such as the protein content in the milk, the processing technology, the addition of fat to the milk, the loss of moisture during the ripening period, and the addition of calcium chloride to pasteurized milk (FOX et al., 2017FOX, P. F.; et al. In: Fundamentals of Cheese Science, 2nd ed., New York: Springer US, 2017, 799 p.).
The calcium content in traditional Camembert cheese is 388 mg/100 g (USDA, National Nutrient Database for Standard Reference, 2018USDA. Department of Agriculture, Agricultural Research. National Nutrient Database for Standard Reference, Release 2018. Available from: <Available from: https://fdc.nal.usda.gov/download-datasets.html
>. Accessed: Nov. 22, 2018.
https://fdc.nal.usda.gov/download-datase...
). The variability of our results indicated the presence and absence of added calcium chloride in cheese processing (Table 1). The high levels of Ca (> 388 mg/100 g) may have occurred due to factors such as the animals’ feed and possible errors in the preparation of the Ca solution (FOX et al., 2017FOX, P. F.; et al. In: Fundamentals of Cheese Science, 2nd ed., New York: Springer US, 2017, 799 p.). The addition of calcium chloride (0.02 g/L) to pasteurized milk helps to achieve constant firmness in the gel and aids the coagulation time (LUCEY et al., 2003LUCEY, J. A. et al. Perspectives on the basis of the rheology and texture properties of cheese. Journal of Dairy Science, v.86, p.2725-2743, 2003. Available from: <Available from: https://doi.org/10.3168/jds.S0022-0302(03)73869-7
>. Accessed: Oct. 30, 2018. doi: 10.3168/jds.S0022-0302(03)73869-7.
https://doi.org/10.3168/jds.S0022-0302(0...
).
The salt content in white mold surface-ripened cheeses is 1.5-2.0% (w/w) (LECLERCQ-PERLAT, 2011LECLERCQ-PERLAT, M. N. Cheese: camembert, brie, and related varieties. In: FUQUAY, J.W.; MCSWEENEY, P.L.H.; FOX, P.F. (Eds). Encyclopedia of Dairy Sciences, 2n
d ed., pp. 773-782. Mississipi: Elsevier, 2011, 4170p.). The sodium content presented great variability (up to 80.3%, Table 1) but was below the values established for Brie-type cheese (842 mg/100 g) and Camembert-type (629 mg/100 g) cheese (USDA, National Nutrient Database for Standard Reference, 2018USDA. Department of Agriculture, Agricultural Research. National Nutrient Database for Standard Reference, Release 2018. Available from: <Available from: https://fdc.nal.usda.gov/download-datasets.html
>. Accessed: Nov. 22, 2018.
https://fdc.nal.usda.gov/download-datase...
). This high variability is related to the lack of control of the salting process. Low concentrations of salt may: (1) affect the control of lactic bacteria growth; (2) not be effective to prevent undesirable microbial growth by killing or limiting the growth of foodborne pathogens and spoilage microorganisms; (3) affect the taste; and (4) modify the water binding capacity with casein, which affects the stability and textural properties of the cheese (EL-BAKRY, 2012EL-BAKRY, M. Salt in cheese: A review. Current Research in Dairy Sciences, v.4, n.1, p.1-5, 2012. Available from: <Available from: https://doi.org/10.3923/crds.2012.1.5
>. Accessed: Jun. 13, 2018. doi: 110.3923/crds.2012.1.5.
https://doi.org/10.3923/crds.2012.1.5...
).
The whiteness index (WI) can be used as an indicator of the complete recoating of the mycelium on the surface of cheese (JUDACEWSKI et al., 2016JUDACEWSKI, P. et al. Quality assessment of white mold-ripened cheeses manufactured with different lactic cultures. Journal of the Science of Food and Agriculture, v.96, p.3831-3837, 2016. Available from: <Available from: https://doi.org/10.1002/jsfa.7577
>. Accessed: Oct. 20, 2018. doi: 10.1002/jsfa.7577.
https://doi.org/10.1002/jsfa.7577...
). The mean WI values for the whole cheese and cheese wedges were 69.9 and 90.9, respectively. The lower whiteness index for the cheese wedge was related to the handling and type of packaging (PVC film stretchable).
The texture profiles between the two groups of cheeses presented high amplitude (Table 1). At the beginning of ripening, fresh cheeses present a firm and brittle texture (hardness of >10 N) and after ripening they become soft (LECLERCQ-PERLAT, 2011LECLERCQ-PERLAT, M. N. Cheese: camembert, brie, and related varieties. In: FUQUAY, J.W.; MCSWEENEY, P.L.H.; FOX, P.F. (Eds). Encyclopedia of Dairy Sciences, 2n
d ed., pp. 773-782. Mississipi: Elsevier, 2011, 4170p.). The mean values for the whole cheese and cheese wedges indicated that they were partially ripened (Table 1). However, the minimum values for hardness (< 3.8 N) indicated that the cheeses were soft. The ripening time may have influenced the high variability in the hardness values (up to 91%, Table 1) that were reported. The softness of these cheeses was due to the increase in pH levels (4.6 to 6.8), which was caused by the surface microbiota flora that solubilize the calcium phosphate between the units of caseins, enabling the hydrolysis of the proteins (β-casein, k-casein, αs1-casein and αs2-casein) by the rennet (LUCEY et al., 2003LUCEY, J. A. et al. Perspectives on the basis of the rheology and texture properties of cheese. Journal of Dairy Science, v.86, p.2725-2743, 2003. Available from: <Available from: https://doi.org/10.3168/jds.S0022-0302(03)73869-7
>. Accessed: Oct. 30, 2018. doi: 10.3168/jds.S0022-0302(03)73869-7.
https://doi.org/10.3168/jds.S0022-0302(0...
; SPINNLER, 2017SPINNLER, H. -E. Surface mold-ripened cheeses. In: MCSWEENEY, P.L.H.; FOX, P.F.; PAUL, D.; COTTER, P.D.; EVERETT, D.W. (Eds). Cheese: chemistry, physics and microbiology, 4th ed., pp.911-928. London: Academic Press, 2017.). The diffusion of fungal proteases is limited and can only affect a few superficial millimeters in white mold surface-ripened cheeses. Therefore, proteolysis is not responsible for the softening of this class of cheese (SPINNLER, 2017SPINNLER, H. -E. Surface mold-ripened cheeses. In: MCSWEENEY, P.L.H.; FOX, P.F.; PAUL, D.; COTTER, P.D.; EVERETT, D.W. (Eds). Cheese: chemistry, physics and microbiology, 4th ed., pp.911-928. London: Academic Press, 2017.). The values for cohesiveness, chewiness and resilience were similar for both types of cheese (Table 1).
An important difference between the minimum and maximum values was observed in all evaluated parameters. However, among mean results no significant difference was observed in relation to the majority of the chemical parameters and the texture profile. Therefore, these mean values could be considered the recommended for these cheeses in Brazil.
In our study, L. monocytogenes was reported in one sample of whole cheese (5%). The presence of L. monocytogenes may be related to the inefficient pasteurization of milk, or defects in the hygiene of the processing environment and equipment used in the manufacture of cheese (GUATEMIM et al., 2016GUATEMIM, E. L. X., et al. Evaluation of the microbiological quality of ricotta cheese commercialized in Santa Catarina, Brazil. Food Science and Technology, v.36, n.4, p.612-615, 2016. Available from: <Available from: http://dx.doi.org/10.1590/1678-457x.08716
>. Accessed: Sep. 15, 2018. doi: 10.1590/1678-457x.08716.
http://dx.doi.org/10.1590/1678-457x.0871...
). According to RYSER & MARTH (1987RYSER, E. T.; MARTH, E. H. Fate of Listeria monocytogenes during the manufacture and ripening of camembert cheese. Journal of Food Protection, v.50, n.5, p.372-378, 1987. Available from: <Available from: https://doi.org/10.4315/0362-028X-50.5.372
>. Accessed: Oct. 20, 2018. doi: 10.4315/0362-028X-50.5.372.
https://doi.org/10.4315/0362-028X-50.5.3...
) and CIBELLI et al. (2008CIBELLI, F. et al. Proteolytic activity of moulds and their metabiotic association with Salmonella sp in a model system. Journal of Food Protection, v. 71, p. 2129-2132, 2008. Available from: <Available from: https://doi.org/10.4315/0362-028X-71.10.2129
>. Accessed: Jun. 13, 2018. doi: 10.4315/0362-028X-71.10.2129.
https://doi.org/10.4315/0362-028X-71.10....
), L. monocytogenes, E. coli O157:H7 and Salmonella infantis can grow in parallel with increased pH levels in white mold surface-ripened cheeses.
In terms of Salmonella sp., all the evaluated samples of whole and fractionated cheese presented negative results. The search for coagulase-positive Staphylococcus and thermotolerant coliforms in the samples presented satisfactory results (< 10 CFU/g and < 3-120 MPN/g, respectively) in accordance with the norms established by RDC no.12/2001 (BRASIL, 2001 BRASIL. Ministério da Saúde. Agência Nacional de Vigilância Sanitária - ANVISA. Resolução da Diretoria Colegiada -RDC nº 12, de 02 de janeiro de 2001. Available from: <Available from: http://portal.anvisa.gov.br/documents/33916/0/Resolu%C3%A7%C3%A3o+RDC+n%C2%BA+12%2C+de+02+de+janeiro+de+2001/0fa7518b-92ff-4616-85e9-bf48a6a82b48
>. Accessed: May, 25, 2018.
http://portal.anvisa.gov.br/documents/33...
). These results suggested that the hygiene milking, cooling and pasteurization of the milk were well controlled (TRMČIĆ et al., 2016TRMČIĆ, A. et al. Coliform detection in cheese is associated with specific cheese characteristics, but no association was found with pathogen detection. Journal of Dairy Science, v.99, p.6105-6120, 2016. Available from: <Available from: https://doi.org/10.3168/jds.2016-11112
>. Accessed: Sep. 18, 2018. doi: 10.3168/jds.2016-11112.
https://doi.org/10.3168/jds.2016-11112...
; GUATEMIM et al., 2016GUATEMIM, E. L. X., et al. Evaluation of the microbiological quality of ricotta cheese commercialized in Santa Catarina, Brazil. Food Science and Technology, v.36, n.4, p.612-615, 2016. Available from: <Available from: http://dx.doi.org/10.1590/1678-457x.08716
>. Accessed: Sep. 15, 2018. doi: 10.1590/1678-457x.08716.
http://dx.doi.org/10.1590/1678-457x.0871...
).
In addition, multivariate tools were used to evaluate all the variables together and to determine their main effects on the cheeses. Principal component analysis (PCA) was applied to evaluate all the physical, chemical, textural and instrumental color data for the whole cheeses and cheese wedges. The first principal component (PC1) was able to explain up to 21.84% of total variance and PC2 explained 17.05% of total variance, totaling 38.89% (Figure 1). Using a 2D scatter plot it was possible to verify the distinction between the two types of cheese (whole and wedges). The underside of the plot (negative factor 2) mainly contained the cheese wedge samples (Figure 1A), with the differences between the cheeses reflected in higher levels of lactose, pH, protein, diameter and price/kg. The whole cheeses (top side of plot, positive factor 2) were characterized by higher values for hardness, chewiness, acidity, ash, sodium, calcium, height, mean weight and WI (Figure 1B). Multivariate analysis was an efficient tool to differentiate these two groups of cheeses, indicating that they were different.
Principal component analysis (PCA):(A) PCA scores plot; (B) scatter loading plots. Note: W- whole cheeses; F- cheese wedges; NDE- non-fat dry extract; WI- whiteness index.
CONCLUSION:
The whole (Camembert-type) and wedges (Brie-type) cheeses ripened with white mold on the surface were characterized. The results presented high variability (min-max) in all parameters evaluated. This indicated the need to establish identity and quality standards for the class of cheeses ripened with white mold in Brazil. Among the mean results, no significant difference was observed in relation to the majority of the analyses parameters. These mean values could be considered as recommended for these cheeses. L. monocytogenes was reported in a whole cheese sample. The other microbiological parameters indicated that these cheeses were in accordance with the current legislation. Multivariate analysis was an efficient tool to differentiate between these two groups of cheeses produced in Brazil.
ACKNOWLEDGEMENTS
A. Nogueira and I.M. Demiate acknowledge the support of the National Council for Scientific and Technological Development (CNPq) (Grants #303789/2016-6, #303561/2016-5). This study was financed, in part, by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.
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CR-2019-0595.R1
Publication Dates
-
Publication in this collection
10 Jan 2020 -
Date of issue
2020
History
-
Received
10 Aug 2019 -
Accepted
13 Nov 2019 -
Reviewed
05 Dec 2019