Effect of freezing and frozen storage on the physicochemical, organoleptic and microbiological characteristics of a semi-hard ewes' milk cheese

1994 ◽  
Vol 61 (1) ◽  
pp. 133-142 ◽  
Author(s):  
Javier Fontecha ◽  
Carmen Peláez ◽  
Manuela Juárez ◽  
M. Carmen Martín-Hernández
Keyword(s):  
Water Activity ◽  
Frozen Storage ◽  
Sensory Properties ◽  
Microbial Flora ◽  
Amino Groups ◽  
Ripening Period ◽  
Microbiological Characteristics ◽  
Freezing Condition ◽  
Water Holding ◽  
Control Batch

SummaryPhysicochemical, organoleptic and microbiological characteristics of semi-hard ewes' milk cheeses, frozen immediately after manufacture under two different conditions at −35 and −80°C and stored at −20°C for 4 months, were studied during subsequent ripening. Frozen storage after either freezing condition did not result in marked alterations in overall composition or rheological and sensory properties of the cheeses after 45 d ripening. Water activity decreased over the ripening period and this decrease was more pronounced in the frozen batches. The water-holding capacities of the protein in the frozen cheese batches were higher than for the control batch. The level of proteolysis, estimated from the level of amino groups, was higher in the previously frozen cheese. Freezing also reduced the viability of the microbial flora in the cheese. The differences in these characteristics for the two freezing conditions were not significant.

scholarly journals Effect of cryogenic freezing on the textural and sensoric properties of donuts

2019 ◽  
Vol 8 (1-2) ◽  
pp. 29-34
Author(s):  
Karina Ilona Hidas ◽  
Adrienn Tóth ◽  
Eszter Hamar ◽  
Ivett Jakab ◽  
László Friedrich ◽  
...  
Keyword(s):  
Water Activity ◽  
Frozen Storage ◽  
Sensory Properties ◽  
Fibre Content ◽  
Freezing And Thawing ◽  
High Oleic Sunflower Oil ◽  
High Oleic ◽  
Preservation Technology ◽  
Thawing Process ◽  
Pork Fat

Cryogenic freezing is a mild freezing technology due to the formation of small ice crystals. This preservation technology is well applicable for increasing the shelf life of bakery products. In our experiment, we made donut samples of matured dough, traditional dough with pork fat, and dough with increased fibre content made by adding flaxseed flour. They were fried in palm oil and also in high oleic sunflower oil. Donuts were frozen in liquid nitrogen for 60 seconds and they underwent a storage of 7 days at -18°C. Thawing at room temperature and thawing in oven were tested. We investigated how freezing, frozen storage and different thawing processes affect sample texture by penetration. The effect of freezing on water activity and sensory properties were also investigated. In our experiment we found that cryogenic freezing influenced the texture of prepared donuts, but sensory evaluation have shown that this does not lead to a decrease in popularity. In addition, a slight decrease in water activity was observed after freezing and thawing. Heating in oven proved to be the better method for the thawing process of donuts based on sensory properties of products. In addition, consumers preferred the increased fibre content of doughs.

Survival of Staphylococcus aureus and Salmonella Enteritidis on Salted Sardines (Sardina pilchardus) during Ripening

2003 ◽  
Vol 66 (8) ◽  
pp. 1479-1481 ◽  
Author(s):  
J. S. ARKOUDELOS ◽  
F. J. SAMARAS ◽  
C. C. TASSOU
Keyword(s):  
Staphylococcus Aureus ◽  
Water Activity ◽  
Salmonella Enteritidis ◽  
Sardina Pilchardus ◽  
Ripening Process ◽  
Ripening Period ◽  
Viable Cells ◽  
Pure Cultures ◽  
Market Needs

The ripening period for salted sardines ranges from 4 to 6 months, depending on the season. Sometimes producing industries need to distribute the product earlier owing to market needs, and when this happens the product's safety needs to be assured. The purpose of this work was to study the survival of Staphylococcus aureus and Salmonella Enteritidis on salted sardines during a ripening period of 115 days. Salted sardines were inoculated with pure cultures of S. aureus and Salmonella Enteritidis (105 CFU/g of fish on day 0). After 5 days of ripening, the water activity value for the sardines decreased from 0.93 to 0.69. The survival of both pathogens and that of total viable cells were evaluated during the ripening process. Total viable counts decreased by 2 log units over the 115-day ripening period. Salmonella Enteritidis and S. aureus survived for 60 and 90 days, respectively. Therefore, the use of a 90-day ripening period could be effective in assuring the safety of the final product.

scholarly journals Functional and quality attributes of beef burgers fortified by brown linseed powder

2022 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Sara Basiri ◽  
Mohamamd Hashem Yousefi ◽  
Seyed Shahram Shekarforoush
Keyword(s):  
Physicochemical Property ◽  
Nutritional Value ◽  
Fat Content ◽  
Sensory Attributes ◽  
Sensory Properties ◽  
Fat Absorption ◽  
General Acceptance ◽  
Beef Burger ◽  
Beef Burgers ◽  
Water Holding

The effects of adding brown linseed at different concentrations (3, 4, and 5%) on physicochemical and sensory attributes of beef burgers were analyzed. Linseed powder increased the protein and fat content and decreased the moisture of the raw burgers and the fat absorption after frying. It also increased the ω3, ω6, ω9 level, PUFA/SFA ratio, and reduced the ω6:ω3 fraction. Improving the cooking yield and water holding capacity were other benefits of this fortification. The linseed did not change the texture and sensory properties of burgers but improved the flavor and general acceptance. Adding the linseed powder to the beef burger formulation is a good way for improving the yield and simultaneously improving the physicochemical property and nutritional value of the beef burger.

scholarly journals Banana Pseudo-Stem Increases the Water-Holding Capacity of Minced Pork Batter and the Oxidative Stability of Pork Patties

Foods ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 2173
Author(s):  
Diego E. Carballo ◽  
Irma Caro ◽  
Cristina Gallego ◽  
Ana Rebeca González ◽  
Francisco Javier Giráldez ◽  
...  
Keyword(s):  
Oxidative Stability ◽  
Frozen Storage ◽  
Meat Products ◽  
Thiobarbituric Acid ◽  
Sodium Ascorbate ◽  
Thiobarbituric Acid Reactive Substances ◽  
Pork Patties ◽  
Minced Meat ◽  
Water Holding ◽  
Tbars Formation

Banana pseudo-stem (BPS), which is rich in fibre and polyphenols, is a potential functional ingredient for the food industry. In this study, BPS was added at concentrations of 1.5, 3.0, and 4.5 g/kg to a minced pork batter to evaluate its performance as a filler and to pork burger patties to evaluate its performance as a natural antioxidant. The effects of BPS were compared with those of carrageenan and ascorbate, which are a conventional binder and antioxidant, respectively. The performance of BPS was similar to that of carrageenan in terms of the cooking yield and texture of the cooked batter. BPS reduced the brightness of fresh patties and appeared to reduce oxidative discolouration during the frozen storage of raw patties. Moreover, BPS reduced the levels of thiobarbituric acid reactive substances (TBARS) during the refrigerated and frozen storage of cooked patties. A greater decrease in TBARS formation was observed with 4.5 g BPS/kg compared with 0.5 g sodium ascorbate/kg during refrigerated storage. In contrast to ascorbate, BPS promoted the presence of lipid-derived volatile compounds induced by thermal breakdown in the headspace of cooked patties. Nonetheless, this effect was reduced as the amount of BPS in the patties increased. In cooked minced meat products, BPS could increase cooking yields and lipid oxidative stability during storage and might result in a more intense flavour.

scholarly journals Comparative Effect of Frying and Baking on Chemical, Physical, and Microbiological Characteristics of Frozen Fish Nuggets

Foods ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 3158
Author(s):  
David Oppong ◽  
Worawan Panpipat ◽  
Ling-Zhi Cheong ◽  
Manat Chaijan
Keyword(s):  
Fatty Acid Content ◽  
Frozen Storage ◽  
Storage Period ◽  
Plate Count ◽  
Cooking Methods ◽  
Microbiological Characteristics ◽  
Yellow Color ◽  
Frozen Fish ◽  
Storage Times ◽  
Carbohydrate Contents

The effects of deep-frying and oven-baking on chemical, physical, and microbiological, properties of cassava croaker (Pseudotolithus senegalensis) nuggets during frozen storage were investigated. The moisture, protein, fat, ash, and carbohydrate contents varied among the cooking methods and frozen storage times. The deep-fried nugget had a higher fat content, which resulted in a higher energy value (p < 0.05). The free fatty acid content and peroxide value (PV) of the oven-baked nuggets were higher than the deep-fried ones (p < 0.05). The PV tended to increase with increasing storage time, but it was still within the recommended range for consumption. The deep-fried nugget showed a vivid orange–yellow color, with higher L*, a*, and b* values, while oven-baked nuggets showed a pale-yellow color. The baked nuggets had relatively lower total expressible fluid than the deep-fried nuggets at all time points (p < 0.05). The hardness, springiness, and chewiness of deep-fried nuggets were higher than baked nuggets throughout the storage period (p < 0.05). The total plate count and yeast and mold counts produced by the two cooking methods were within the acceptable range throughout the storage.

scholarly journals Effect of Frozen Storage on the Water- Holding Capacity and pH of Broiler Chicken cut-up Parts (Gallus gallus domesticus)

2020 ◽  
pp. 8-15
Author(s):  
Arjun Ghimire ◽  
Pawan Parajuli
Keyword(s):  
Broiler Chicken ◽  
Frozen Storage ◽  
Gallus Gallus ◽  
Gallus Domesticus ◽  
Cooking Loss ◽  
Water Holding Capacity ◽  
Drip Loss ◽  
Gallus Gallus Domesticus ◽  
Significant Difference ◽  
Water Holding

Broiler chickens (Gallus gallus domesticus) were collected from local chicken suppliers of Dharan (26.8065° N, 87.2846° E), Nepal, and slaughtered to prepare the cut-up parts (breast, drumstick, dorso, wings, and thigh). They were vacuum packed in polythene bags and frozen stored (-21.5 ±3.5ºC) for 45 days to study the effect of frozen storage on the water holding capacity (WHC) of meat. Cooking loss, drip loss, and pH changes were analyzed at 5 days intervals during storage and the data were analyzed using Genstat® v 12.1.The cut-up parts showed a significant change (p<0.05) in pH, cooking loss, and drip loss during 45 days of frozen storage. The pH decreased while the drip loss and the cooking loss increased gradually upon storage. The pH was found to be varied among the cut-up parts with a minimum pH scale of 5.25 for wings, followed by 5.3 for thigh, at the end. The highest drip loss of 6.11% was observed in wings after 5 days of storage which ended up to 8.97% after 45 days of frozen storage while drumstick and thigh samples showed significantly lower drip loss of 6.02%, and 5.43% respectively. The change in cooking loss showed a similar pattern as that of drip loss with a significantly higher value of 37.36% in the breast while it showed no significant difference in drumstick, dorso, and thigh meat. Thus, the study reveals that freezing of broiler chicken meats for a prolonged period adversely affects the WHC of meat

scholarly journals Gluten Free Biscuits in Local Market from Sibiu

2018 ◽  
Vol 10 (1) ◽  
pp. 13-16
Author(s):  
Cosmina-Mădălina Cherăţoiu ◽  
Mihai Ognean ◽  
Claudia Felicia Ognean ◽  
Ioan Danciu
Keyword(s):  
Water Activity ◽  
Sensory Properties ◽  
Breaking Point ◽  
Local Market ◽  
Gluten Free ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Sensory Qualities

Abstract The study was undertaken to assess the quality and sensory properties of gluten free biscuits (GFB) offered in local market in Sibiu. The chemical, physico-chemical parameters and sensory qualities of biscuits were studied. The result revealed that moisture of GFB is normal (<5-6%), the water activity is under 0.3 for 6 of the samples, the breaking point is 0.878 (B7) and 1.564 (B1) as a result of different ingredient used (mix flour-corn, soya, rice for sample B1, rice-chickpeas flour for sample B7). Sensory qualities were determinate by using the hedonic test and showed that the GFB were well accepted by the consumers.

scholarly journals Effect of the partial replacement of wheat flour with turmeric flour (Curcuma longa) on the physicochemical and sensory properties of a common chorizo

DYNA ◽  
2020 ◽  
Vol 87 (214) ◽  
pp. 46-52
Author(s):  
José Igor Hleap Zapata ◽  
Luiza Romero-Quintana ◽  
Jheny Botina-Cárdenas ◽  
Carlos Andrés Martínez-Martínez ◽  
Yenifer Valenciano-Pulido ◽  
...  
Keyword(s):  
Sensory Evaluation ◽  
Wheat Flour ◽  
Curcuma Longa ◽  
Sensory Properties ◽  
Water Holding Capacity ◽  
Partial Replacement ◽  
Sensory Parameters ◽  
Water Holding ◽  
Color Texture

The effect of partial replacement of wheat flour with turmeric flour (Curcuma longa) on the physicochemical and sensory properties of chorizo made with pork was evaluated. Three levels of turmeric flour substitution were proposed 0.8%, 1.4% and 2.1%, corresponding to a substitution of a 19.04%, 33.33% and 50,00%, respectively, along with a control chorizo without the addition of said flour. The pH, water holding capacity, color, texture and sensory evaluation were measured. The pH tended towards acidity in the treatment with the greatest inclusion of uremic flour. The sensory evaluation was carried out with to untrained panelists who determined the chorizo with the highest acceptability. For the sensory parameters, there were no significant differences, except for color. Therefore, turmeric flour can be used as a partial substitute for wheat flour in the production of common chorizo without affecting physicochemical and sensory properties.

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