Effects of Temperature, Light and Storage Time on the Physicochemical and Sensory Characteristics of Vacuum- or Nitrogen-Packed Frankfurters

1983 ◽  
Vol 46 (3) ◽  
pp. 188-195 ◽  
Author(s):  
R. E. SIMARD ◽  
B. H. LEE ◽  
C. L. LALEYE ◽  
R. A. HOLLEY
Keyword(s):  
Storage Time ◽  
Storage Temperature ◽  
Co2 Concentration ◽  
Relative Volume ◽  
Nitrogen Gas ◽  
Storage Duration ◽  
Significant Relationships ◽  
Effects Of Temperature ◽  
Sensory Color ◽  
And Storage

Frankfurters prepacked in vacuum or nitrogen gas were stored for 49 d at −4, 0, 3 and 7°C under dark and light conditions. Effects of temperature, light and storage duration on physiocochemical (gas composition, TBA, pH, ERV, nitroso-hematin) and sensory (color and off-odor) characteristics of both package samples were then examined. The relative volume of nitrogen decreased gradually but the change was not significant (P>0.05) during the 49-d study. No significant increases in CO2 concentration were observed between both package treatments at −4 and 0°C, whereas the largest increase in CO2 content (4.8–16.8%) occurred at 7°C after 21 d of storage. TBA, pH, ERV and nitroso-hematin values were not differently affected by either modified atmosphere types, regardless of storage temperature and illumination used. With respect to surface discoloration and off-odor, nitrogen-packed frankfurters exhibited a lower incidence of discoloration and off-odor and were of satisfactory appearance, even after 35 d of storage at 7°C. Vacuum-packed samples, however, could not be effectively stored longer than 21 d due to formation of brown and green discolorations. Light generally had a significant effect on surface discoloration of vacuum-packed frankfurters. Data indicate that color and odor changes were not related to the values of TBA, ERV and nitro so-pigment but significant relationships were noted between pH. CO2 and microflora counts at 7°C.

Effects of Temperature, Light and Storage Time on the Microflora of Vacuum- or Nitrogen-Packed Frankfurters

1983 ◽  
Vol 46 (3) ◽  
pp. 199-205 ◽  
Author(s):  
R. E. SIMARD ◽  
B. H. LEE ◽  
C. L. LALEYE ◽  
R. A. HOLLEY
Keyword(s):  
Storage Time ◽  
Microbial Growth ◽  
Initial Level ◽  
Anaerobic Bacteria ◽  
Nitrogen Gas ◽  
Storage Duration ◽  
Effects Of Temperature ◽  
Mold And Yeast ◽  
Spoilage Microflora ◽  
And Storage

Frankfurters were vacuum- or nitrogen- packaged and stored at −4, 0, 3 and 7°C for 49 d under light or dark display conditions. Effects of temperature, light and storage duration on microflora in vacuum- and nitrogen-packed sausages were then examined. Differences in number of lactobacilli, psychrotrophic and anaerobic bacteria in vacuum- or nitrogen-packed samples were not statistically significant during storage tests. Lactobacillus development was slightly higher in nitrogen gas compared to vacuum packages, but was also not significantly different. The effectiveness of nitrogen packaging on yeast and mold inhibition was significant, particularly at higher temperatures (3 and 7°C). Nitrogen gas packaging thus offers little advantage over vacuum to promote lactobacillus development, but it is particularly effective against growth of mold and yeast. Initially, the dominant flora of both package samples consisted of Pseudomonas and Microbacterium sp. but Lactobacillus sp. became the predominant psychrotrophs (85.2–96.3%) after 49 d of storage, regardless of different treatments. Temperature was the most important factor which influenced growth of the microflora on frankfurters; freezing temperatures of −4 and 0°C were an effective insurance against development of spoilage microflora in frankfurters for up to 49 d, regardless of packaging atmosphere. With an initial level of 10 to 103 coliforms per gram, there was no significant change in the number of coliforms during storage. Light had no important influence on microbial growth in frankfurters, irrespective of packaging atmosphere.

Shelf-Life of Meat Loaves Packaged in Vacuum or Nitrogen Gas 2. Effect of Storage Temperature, Light and Time on Physicochemical and Sensory Changes

1984 ◽  
Vol 47 (2) ◽  
pp. 134-139 ◽  
Author(s):  
B. H. LEE ◽  
R. E. SIMARD ◽  
C. L. LALEYE ◽  
R. A. HOLLEY
Keyword(s):  
Shelf Life ◽  
Storage Temperature ◽  
Gas Composition ◽  
Nitrogen Gas ◽  
Significant Relationships ◽  
Sensory Changes ◽  
Effects Of Temperature ◽  
Increasing Temperature

Effects of temperature, light and time of storage on the physicochemical (gas composition, pH, extract release volume (ERV), exudate and TBA) and sensory (appearance and off-odor) changes of vacuum- or nitrogen-packed meat loaves were examined at intervals during 49 d of storage at −4, 0, 3 and 7°C under dark and lighted display. Meat loaves stored at −4°C did not exhibit significant changes during 49 d of storage, but extending duration and increasing temperature above 0°C had a significant effect on the shelf-life of meat loaves, regardless of treatments. Appearance and off-odor changes were not related to those of ERV, exudate and TBA, but significant relationships were noted between CO2, pH and sensory changes. Overall, nitrogen packaging significantly improved appearance by retarding the greenish discoloration of meat loaves. Light increased the frequency of green discoloration of vacuum-packed samples after 28 d at 0, 3 and 7°C as compared to nitrogen-packed samples.

scholarly journals Concentration, Temperature and Storage duration Influence Chemical Stability of Compost Tea

2020 ◽  
Vol 9 (3) ◽  
pp. 87
Author(s):  
Sanjamveer S. Vehniwal ◽  
Raphael Ofoe ◽  
Lord Abbey
Keyword(s):  
Chemical Stability ◽  
Storage Time ◽  
Storage Temperature ◽  
Principal Component ◽  
Compost Tea ◽  
Multilinear Regression ◽  
Storage Duration ◽  
Msw Compost ◽  
Close Relationship ◽  
And Storage

Chemical stability is one of the key quality control criterion for complex degradable materials with an active microbial community like compost tea, but largely understudied. A laboratory study was performed to assess the chemical stability of varying concentrations (0, 2.5, 5, 10, 15, 20, 30, 50 and 100%) of municipal solid waste (MSW) compost tea stored at different temperatures (4°, 10°, 22° and 35°C) and storage time (0, 13, 26 39 and 52 days). A 2-dimension principal component biplot confirmed close relationship amongst total dissolved solids (TDS), electric conductivity (EC) and salinity while pH was less related and turbidity was isolated. TDS in the MSW compost tea did not change at a storage temperature of 4oC or 10oC but was significantly (P<0.05) increased by 4.3% when the storage temperature was raised to 35oC. Also, TDS increased sharply from 93.25 mg/L on day 1 to 111.31 mg/L on day 26 after which it remained unchanged. EC increased by approximately 8% only when the MSW compost tea was stored at 35oC. The EC on the other hand increased by 19.4% from 131.28 µS/cm on day 1 when it peaked on day 26 and plateaued off to day 52. The change in pH was small and ranged from 7.44 to 7.67. Concentration had the strongest association with TDS, EC, salinity and turbidity and did not vary with storage time nor temperature. A multilinear regression (Y = αD + βC + γT + k) showed significant (P<0.05) coefficients for all the independent variables except the coefficients for temperature in the turbidity, salinity and pH regression models. In conclusion, the chemical stability of the MSW compost tea was dependent on the storage temperature and storage duration. Chemical stability was reached after 26 days of storage while cold storage at 4oC or 10oC reduced chemical alteration.

Shelf-Life of Meat Loaves Packaged in Vacuum or Nitrogen Gas I. Effect of Storage Temperature, Light and Time on the Microflora Change

1984 ◽  
Vol 47 (2) ◽  
pp. 128-133 ◽  
Author(s):  
B. H. LEE ◽  
R. E. SIMARD ◽  
C. L. LALEYE ◽  
R. A. HOLLEY
Keyword(s):  
Shelf Life ◽  
Storage Time ◽  
Storage Temperature ◽  
Initial Level ◽  
Nitrogen Gas ◽  
Cured Meat ◽  
The Times ◽  
Yeasts And Molds ◽  
Lactobacillus Spp ◽  
Vacuum Storage

The effects of storage temperature, light and time on the microflora of vacuum- or nitrogen-packed meat loaves were examined at intervals during 49 d at −4, 0, 3 and 7°C under dark and lighted displays. Storage of cooked cured meat loaves at −4°C for 49 d produced little increase in lactobacilli numbers (from log10 5.2 to 6.3) but resulted in significant (P<0.05) increases in psychrotrophs (log10 3.9 to 5.9) and anaerobes (log10 5.1 to 6.3 under vacuum). Storage time and temperature above 0°C resulted in a significant (P<0.05) increase in lactobacilli, psychrotroph and anaerobe numbers, regardless of packaging atmospheres, but the times at which counts reached approx. 108/g were deferred, i.e., day 7 at 7°C, day 21 at 3°C and day 28 at 0°C. Apart from a few exceptions in the numbers of psychrotrohs and lactobacilli, there were no significant differences in the numbers of microflora between vacuum- and nitrogen-packed meat loaves. At day 0, the dominant flora in both types of packaged samples was composed of Pseudomonas (32 to 34%), Brochothrix (24 to 38%), Micrococcus (9 to 22%) and Lactobacillus spp. (7 to 20%). By day 49, Lactobacillus spp. became a predominant part (62 to 76%) of the psychrotrophs. Few significant differences in the composition of psychrotrophs were found among different treatments. With an initial level of 102 coliforms per gram, there was no significant (P>0.05) change in coliforms counts between treatments but the numbers of yeasts and molds were lower in nitrogen-packed samples at 3 and 7°C as compared with similarly treated vacuum-packed samples.

Effect of Different Packaging Methods and Storage Temperature on Microbiological and Physicochemical Quality Characteristics of Meatball

2010 ◽  
Vol 16 (3) ◽  
pp. 259-265 ◽  
Author(s):  
I. Yilmaz ◽  
M. Demirci
Keyword(s):  
Storage Time ◽  
Storage Temperature ◽  
Microbiological Quality ◽  
Thiobarbituric Acid ◽  
Quality Characteristics ◽  
Modified Atmosphere ◽  
Physicochemical Changes ◽  
Negative Factors ◽  
And Storage

The objective of this research was to determine physicochemical changes and microbiological quality of the different packaged meatball samples. Meatball samples in polystyrene tray were closed with polyethylene film (PS packs), vacuumed and modified atmosphere packaged, (MAP) (65% N2, 35% CO2), and held under refrigerated display (4 °C) for 8, 16 and 16 days for PS packs, vacuum and MAP, respectively. Microbial load, free fatty acids and thiobarbituric acid values of the samples tended to increase with storage time. Bacteria counts of the raw meatball samples increased 2 log cycles at the end of storage compared with initial values. Meatball samples can be stored without any microbiological problem for 7 days at 4 °C. Results from this study suggested that shelf-life assigned to modified-MAP and vacuum-packed meatballs may be appropriate. Meatball samples underwent physical deformation when they were packed before vacuum process. With these negative factors considered, MAP is superior to other two packs methods.

Effects of temperature and storage time on hen eggs quality

2012 ◽  
Vol 161 ◽  
pp. 40 ◽  
Author(s):  
Roxana Nicoleta Raţu (Gavril) ◽  
M.G. Usturoi
Keyword(s):  
Storage Time ◽  
Effects Of Temperature ◽  
And Storage ◽  
Eggs Quality
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