The effect of 31 vs. 38 degree holding temperature on meat quality.
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1 The effect of 31 vs. 38 degree holding temperature on meat quality. South Dakota State University December 23, 1999 Principal Investigator: D. M. Wulf Graduate Students: B. J. Reuter and J. M. Bok Microbiologist: D. R. Henning Meat Chemist: D. M. Simon Meat Laboratory Manager: L. E. Warborg Objective: Determine the differences in meat product quality and microbial growth during refrigerated storage at 31 F vs. 38 F. Design: 4 products (all packaged aerobically in retail wrap) Ground beef, Beef top round steak, Boneless and skinless chicken breast, Fully-cooked & sliced turkey breast 2 storage temperatures 31 F and 38 F 15 storage times for panel evaluations, colorimeter readings, and digital photographs 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 days 3 storage times for microbiology and TBARS 0, 7, 14 days Triplicate (3) samples of each treatment combination Procedures: All products were obtained through normal commercial retail channels. Two 10-lb
2 course-ground beef chubs, produced by a single processor, were obtained. The course-ground beef was mixed, fine ground, pattied, and packaged at the SDSU Meat Laboratory using clean equipment. A single beef top round was obtained that was still in an intact vacuum package as shipped from the packer. This vacuum package was opened at the SDSU Meat Laboratory and sliced into steaks. Boneless, skinless chicken breasts were obtained as bulk packaged by the processor (not case-ready) in a plastic bag-lined box. All products were packaged at the SDSU Meat Laboratory using retail styrofoam trays, soaker pads, and oxygen-permeable overwrap film. The ground beef, beef steak, and chicken breast packages were held in a retail case for 24 hrs after packaging and prior to the start of the test to simulate time in retail display. A single cooked turkey product was obtained with a Use-by date that would not be reached until after the completion of the entire 14-day study. Following the 24-hr retail display of the fresh products, the cooked turkey breast was sliced and packaged, and then all products were held at room temp (70 F) for 90 minutes to simulate consumer shopping and transportation time. Following this 90-minute period, all packages were randomly assigned into either 31 or 38 F refrigeration for the duration of the trial. Ambient temperature and relative humidity were monitored in each of the two refrigeration chambers for the duration of the trial with readings taken every 30 minutes. Internal product temperature was recorded on a beef steak (different steak than those for microbiology, TBARS, or panel) once daily in each chamber. Actual ambient temperature and relative humidity reading for the entire 15-day study period were as follows: 31 F chamber 38 F chamber Mean SD Mean SD Ambient temperature Relative humidity Panel Evaluation: Sensory panel evaluations were conducted once daily to visually score the packaged meat samples for percent discoloration and overall desirability. In addition, the panelists were asked daily whether or not each package was acceptable to eat (based only on visual appraisal). The panel consisted of eight members. The panelists evaluated the packages between 6:00 and 10:00 a.m. each day. Percent discoloration and overall desirability were scored on each sample using the following hedonic scales: Percent Surface Discoloration Overall Desirability 8 = None 8 = Extremely desirable
3 7 = 1 to 5 % 7 = Very desirable 6 = 6 to 10 % 6 = Moderately desirable 5 = 11 to 25 % 5 = Slightly desirable 4 = 26 to 50 % 4 = Slightly undesirable 3 = 51 to 75 % 3 = Moderately undesirable 2 = 76 to 99 % 2 = Very undesirable 1 = Complete 1 = Extremely undesirable Colorimeter readings: Colorimeter readings were taken once daily using a Minolta CR-310 Chroma- Meter with a D65 illuminant and a 50 mm-diameter measurement area. Digital photographs: Digital photographs were taken once daily on the most representative sample (of three) for each product by temperature combination. Files were written to 15 diskettes, one diskette for each day. See enclosure for further explanation. Microbial counts: Samples were aseptically sampled, blended with diluent in a stomacher, and spiral plated. A 1:10 and a 1:1,000 dilution were spiral plated after 5 days into the experiment to ensure that countable plates were obtained. Mesophilic plates were incubated at 32±1ºC for 48 ±4 hr and then counted. Psychrophilic plates were incubated at 7±1ºC for 10 days and then counted. TBARS: Thiobarbituric reactive substances (TBARS) were determined by distillation as described by Tarladgis et al. (1960) and Wang et al. (1997). TBARS is a measure of rancidity which corresponds to the development of off-flavors in meat products. Statistical analysis: Sensory panel and colorimeter data were analyzed using a multivariate repeated measures analysis. Microbial counts were converted to log CFU per gram of sample. Microbial data and TBARS data were analyzed using one-way ANOVA (day 7
4 data and day 14 data were analyzed separately). Ground Beef Results Ground beef discolored at a faster rate in 38 F than in 31 F. Overall desirability declined at a faster rate in 38 F than in 31 F. Ground beef discolored 3 to 4 days later in 31 F than in 38 F. Ground beef lasted 3.32 days longer (64% longer) in 31 F (8.98 days) than in 38 F (5.66 days) before panelists said that they would not eat it (Length of time was determined as that point when 50% of the panelists said that they would not eat it). Instrument measures of color confirmed that 31 F storage delayed the discoloration of ground beef by approximately 3 days as compared to 38 F storage. Both mesophiles and psychrotrophes grew faster in 38 F storage than in 31 F storage. Psychrotrophes grew faster than mesophiles regardless of refrigeration temperature. Psychrotrophes counts were nearly 10,000 fold higher than mesophilic counts at 14 days. Ground beef had higher TBARS values in 38 F storage than in 31 F storage at 7 days and especially at 14 days. TBARS is a measure of rancidity, thus indicating that ground beef stored at 38 F would develop off flavors more quickly than ground beef stored at 31 F.
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7 Beef Steak Results Beef steak discolored at a faster rate in 38 F than in 31 F.
8 Overall desirability declined at a faster rate in 38 F than in 31 F. Beef steak discolored 6 to 7 days later in 31 F than in 38 F. Beef steak lasted 6.53 days longer (154% longer) in 31 F (10.76 days) than in 38 F (4.23 days) before panelists said that they would not eat it (Length of time was determined as that point when 50% of the panelists said that they would not eat it). Instrument measures of color confirmed that 31 F storage delayed the discoloration of beef steak by approximately 7 days as compared to 38 F storage. There was no difference between 38 F and 31 F storage in mesophilic bacterial counts at 7 days of storage (p>.05); however, mesophilic bacterial counts were higher in 38 F storage than in 31 F storage at 14 days of storage. Psychrotrophic bacterial counts were higher in 38 F storage than in 31 F storage at 7 days of storage; however, there was no difference between 38 F and 31 F storage in psychrotrophic bacterial counts at 14 days of storage (p>.05). TBARS (rancidity) increased from day 0 to day 7 in beef steak at both storage temperatures but did not change significantly from day 7 to day 14. Storage temperature did not affect rancidity development in beef steak (p>.05).
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11 Beef Steak Comparisons by Day
12 31 Degrees 38 Degrees Boneless, Skinless Chicken Breast Results Chicken breast discolored at a faster rate in 38 F than in 31 F. Overall desirability declined at a faster rate in 38 F than in 31 F. Chicken breast discolored 2 to 2½ days later in 31 F than in 38 F. Chicken breast lasted 2.04 days longer (23% longer) in 31 F (10.88 days) than in 38 F (8.84 days) before panelists said that they would not eat it (Length of
13 time was determined as that point when 50% of the panelists said that they would not eat it). Instrument measures of color revealed only slight, although statistically significant, differences between chicken breast stored at 31 F versus chicken breast stored at 38 F. Both mesophiles and psychrotrophes grew faster in 38 F storage than in 31 F storage. The difference in bacterial growth between 31 F and 38 F was greater for the chicken breast than for the other three meat products. TBARS (rancidity) increased from day 0 to day 7 in chicken breast at both storage temperatures but did not change significantly from day 7 to day 14. Storage temperature did not affect rancidity development in chicken breast (p>. 05).
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16 Cooked Turkey Results Cooked turkey discolored at a faster rate in 38 F than in 31 F.
17 Overall desirability declined at a faster rate in 38 F than in 31 F. Cooked turkey lasted longer in 31 F than in 38 F before panelists said that they would not eat it. Instrument measures of color revealed only slight, although statistically significant, differences between cooked turkey stored at 31 F versus cooked turkey stored at 38 F. There was no difference between 38 F and 31 F storage in either mesophilic or psychrotrophic bacterial counts at 7 days of storage (p>.05); however, both mesophilic and psychrotrophic bacterial counts were higher in 38 F storage than in 31 F storage at 14 days of storage. TBARS (rancidity) in cooked turkey was not affected by either storage time or storage temperature (p>.05). This lack of rancidity development in turkey breast was probably due to the presence of antioxidant ingredients (this was a processed, restructured turkey product).
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20 References: Tarladgis, B. G., B. M. Watts, M. T. Younathan, and L. Dugan Jr A distillation method for quantitative determination of malonaldehyde in rancid foods.
21 J. Amer. Oil Chem. Soc. 37:44. Wang, C., L. Zhu, and M. S. Brewer Comparison of 2-thiobarbituric acid reactive substances determination methods in various types of frozen, fresh meat. J. Food Lipids 4:87.
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