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Production of reduced-fat Majorero cheese using supercritical CO2 D.

Objective

The aim of this experiment was to evaluate the effect of pressure (100, 200, 300 and 400 bar) of the scCO2 on the amount of fat extracted, microbial population, polar lipids profile, and microstructure of two varieties of goat cheese: Majorero, a PDO cheese from Spain, and goat Gouda-type cheese.

N.

3 Castro ,

R.

2 Jiménez-Flores

Department of Agroindustrial Engeniering. Universidad Nacional de Chimborazo, Riobamba, Ecuador. dsanchez@unach.edu.ec 2 Dairy Products Technology Center, California Polytechnic State University, United States 3Department of Animal Science, Las Palmas de Gran Canaria University, Arucas 35413, Spain

Introduction

Majorero goat cheese

Control in fridge

Gouda goat cheese

Control in incubator (35ºC)

Treated with supercritical CO2 (20gr/min during 50 min at 35ºC)

Material y methods

Consumer trends for healthier food choices and preferences for low-fat products have increased the interest in low-fat cheese and nutraceutical dairy products. However, consumers still value flavor over attributes in food. There are several strategies to produce low fat cheese. The method reported in this study is another option to the conventional cheesemaking strategy to produce reduced/low fat cheese. Using CO2 as supercritical fluid (scCO2) offers an alternative to reduce fat in cheese after ripening, maintaining the initial characteristics and flavor.

A.

2 3 Laubscher , A. Argüello ,

100 bar of pressure 200 bar 300 bar 400 bar

Cheese Analyses • Gross chemical composition (Kjeldalh, Babcock test, CEM oven) • Polar lipids profile  Thin Layer Chromatography • Microbial counts • Petrofilm for total aerobics • M17 agar • MRS agar • Microstructure  Confocal Laser Scanning Microscope (CLSM)

Aerobic bacteria Lactococci

Results and discusion

1

1 Sánchez-Macías *,

W230

10 9 8 7 6 5 4 3 2 1 0 10

Majorero cheese

8

Goat Gouda cheese 6

The microbial population was reduced after the supercritical fluid extraction in both cheeses, and the lethality was higher as pressure increased in Majorero cheese, most noticeably reductions on lactococcus and lactobacillus bacteria. Gouda-type cheese did not contain any lactobacillus.

Control

4

2

0

The amount of fat was reduced 50-57% and 4855%, for Majorero and goat Goudatype cheeses, respectively.

P100

St  Phospholipids (PL) standars: PE (phosphatidil-ethanolamine); PC (phosphatidilcholine); SM (sphingomieline). 1: control cheese; 2, 4 and 6: cheese treated with SC-CO2 at 100, 300 and 400 bars; 3, 5 and 7: fat extracted after treatment with SC-CO2 at 100, 300 and 400 bars.

Higher content of sphingomyelin and phosphatidylcholine on fat basis were found in Majorero cheese compared to the control, and also compared to goat Gouda-type cheese. After supercritical fluid extraction, phospholipids content was increased in fat basis.

P200

P300

P400

Micrographs obtained from confocal laser scanning microscopy showed a more open matrix and whey pockets in the Majorero control cheese. This could explain the effective fat extraction and significant reduction on the microbial counts in this cheese after the treatment with scCO2.

Conclusion The results of this study demonstrated that the supercritical fluid extraction with scCO2 process has potential in the dairy industry and commercial applications. Majorero cheese obtained after the SFE treatment is an excellent candidate to be considered as reduced fat goat cheese, with significant lower cholesterol, but still with all the flavor and health benefits inherent to the goat milk. Reference for more information: Sánchez et al. 2013. J. Dairy Sci. 96 :1325–1334

Queso majorero horizontal  

Poster para la JAM 2013, Indianapolis (EEUU)

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