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Ciência Rural

Print version ISSN 0103-8478On-line version ISSN 1678-4596

Cienc. Rural vol.48 no.4 Santa Maria  2018  Epub Apr 16, 2018

http://dx.doi.org/10.1590/0103-8478cr20170238 

FOOD TECHNOLOGY

Refrigerated storage of pork meat sprayed with rosemary extract and ascorbic acid

Armazenamento resfriado de carne de porco pulverizada com extrato de alecrim e ácido ascórbico

1Facultad de Ciencias de la Alimentación, Universidad Nacional de Entre Ríos (UNER), Tavella 1450, Concordia, ER, Argentina.


ABSTRACT:

There is an increasing consumer demand to avoid the use of synthetic additives like many antioxidants currently added to food. The objective of this study was to determine the effect of spraying ascorbic acid, rosemary extract and a combination of both on pork meat during refrigerated storage. Pork meat with antioxidants sprayed on the surface was packaged under vacuum and stored (4ºC, 45d). pH, color, lipid oxidation, total aerobic count, drip loss and moisture were evaluated during storage. Results suggested that surface application of rosemary extract and a combination of rosemary extract and ascorbic acid resulted in an effective delay of lipid oxidation of pork meat, without affecting pH, colour or water content during storage. No effect of rosemary extract on microbial growth was observed.

Key words: natural antioxidants; oxidation; storage; meat quality

RESUMO:

Existe uma crescente demanda dos consumidores para evitar o uso de aditivos sintéticos como muitos antioxidantes atualmente adicionados aos alimentos. O objetivo deste estudo foi determinar o efeito da pulverização de ácido ascórbico, extrato de alecrim e uma combinação de ambos na carne de porco durante o armazenamento resfriado. A carne de porco com antioxidantes pulverizados na superfície foi embalada sob vácuo e armazenada (4ºC, 45d). pH, cor, oxidação lipídica, contagem de microrganismos aerobios totais, perda por gotejamento e umidade foram avaliados durante o armazenamento. Os resultados sugerem que a aplicação superficial de extrato de alecrim e uma combinação de extrato de alecrim e ácido ascórbico resultaram no atraso efetivo da oxidação lipídica da carne de porco, sem afetar o pH, cor ou teor de água ao longo do armazenamento. Nenhum efeito do extrato de alecrim no crescimento microbiano foi observado.

Palavras-chave: antioxidantes; oxidação; armazenamento; qualidade de carne.

INTRODUCTION:

Industry seeks to maintain the primary quality of meat during processing and storage, but in some instances, increased life provided by cooling may be insufficient. Lipid oxidation will possibly generate undesirable organoleptic characteristics whereas microbial growth may cause both spoilage and food borne diseases. Therefore, delaying lipid oxidation and preventing bacterial growth are factors that can have a significant contribution towards the extension of shelf life (GEORGANTELIS et al., 2007). Nowadays, there is increasing consumer awareness and health-consciousness which result in pressure to avoid the use of synthetic additives (GEORGANTELIS et al., 2007; NAVEENA et al., 2008).

Rosemary (Rosmarinus officinalis) has a high content of polyphenols which have demonstrated antioxidant activity. Moreover certain compounds have been reported as responsible for antimicrobial activity (DEL CAMPO et al., 2000). NISSEN et al. (2004) observed a decrease in TBARS (Thiobarbituric Acid Reactive Substances) and hexanal in cooked pork hamburgers, as a result of adding rosemary extract (200ppm) into the formulation. SÁNCHEZ-ESCALANTE et al. (2001) obtained similar results using 1000ppm rosemary powder on beef burgers. ROJAS & BREWER (2008) reported lower TBARS values than the control without oleoresins when exploring the effect of rosemary oleoresins (0.02%) in pork burgers (packed under vacuum and frozen). In all these studies, rosemary is added in powder form into the formulation or as a solution to minced meat.

Ascorbic acid (vitamin C) is a natural antioxidant. DECKER & XU (1998) reported that ascorbic acid inhibits lipid oxidation in meat products depending on its concentration. MITSUMOTO et al. (1991) evaluated the effect of vitamin C (500mg/kg of meat) on the conservation of minced beef and observed a greater stability of pigment and lower lipid oxidation values. Furthermore, it has been reported that ascorbic acid can act as a synergist agent when used in combination with other antioxidants (ELLIOTT, 1999). SÁNCHEZ-ESCALANTE et al. (2003) reported that vitamin C improves the antioxidant effect of rosemary extract in beef burgers during 16 days of refrigerated storage. In beef burgers, these authors observed a positive effect of rosemary and vitamin C combination on the red color after 20 days of storage (SÁNCHEZ-ESCALANTE et al., 2001).

According to these results, the use of natural antioxidants in the preservation of meat is promising. However, there is little information on its effectiveness in fresh pork meat and its addition by spraying. This method would allow the application of natural antioxidants on the surface of fresh meat easily, with low cost and accessible to retailers. DJENANE et al. (2002) sprayed different antioxidants (vitamin E, taurine and rosemary, in combination with vitamin C) on fresh beef steaks packaged in modified atmosphere. DJENANE et al. (2003) investigated the effect of rosemary extract in combination with vitamin C under UV-free lighting in beef steaks packaged in modified atmosphere. In these studies the use of natural antioxidants by spraying rendered interesting results. The aim of the present research was to study the effect of spraying rosemary extract, ascorbic acid and a combination of both, during storage of fresh pork meat packaged under vacuum.

MATERIALS AND METHODS:

Longissimus dorsi pork muscles were purchased from a local abattoir 48h after slaughter. From each muscle, pork steaks (pork loin medallion steaks) of about 150g weight and 2.5cm thick were taken. They were divided into four groups and treated as follows: (1) spraying with 1ml of pure commercial rosemary alcoholic extract (RE) (Laboratorio Alsina) with 4000ppm total phenols previously determined by Folin-Ciocalteu reagent; (2) spraying with 1ml of l-ascorbic acid solution (AA), 500ppm freshly prepared (Sigma Chemical Co); (3) spraying with 1ml of a freshly prepared mixture with pure commercial rosemary extract and l-ascorbic acid solution in 1:1 ratio (RE+AA); and (4) without antioxidants (control). As steaks were being sprayed, they were individually placed in bags and vacuum packaged (Multivac, Sepp Haggenmüller GmbH & Co.KG, Germany). Bags had an oxygen transmission rate <25cc/m2/24h at 4ºC. Bags were stored in darkness at 4±1ºC for 45d. Steaks of each treatment (n: 6) were analyzed at 0, 15, 30 and 45 days of refrigerated storage.

Analytical determinations

Pork meat was taken out of the bag once the set storage times were reached. Each steak was weighed for drip loss measurement and material for microbiological determination was separated, both procedures done under aseptically conditions. The pH and color were measured on the remaining sample which was then frozen (and vacuum packaged) for TBARS (Thiobarbituric Acid Reactive Substances) and moistures analysis. The pH was measured with a portable pHmeter (35805-18 Model, Oakton, Singapore) with glass puncture electrode. Moisture content was determined following the drying air method (AOAC 950.46, 2005). Drip loss was calculated as the difference between the initial steak weight (before packaging) and final weight (after the corresponding storage period) and expressed as a percentage of the initial weight. Lipid oxidation was assessed by TBARS using the aqueous extraction method (PIKUL et al., 1989). Meat samples were thawed (24h, 4°C) and they immediately were ground (10g) and homogenized with cold extracting solution containing 4% perchloric acid. The blended sample was filtered through Whatman No. 1 filter paper. The filtrate was adjusted to 50mL by adding 4% perchloric acid. Next, 5-mL aliquots of the filtrate were transferred to separate test tubes and mixed with 5mL of 0.02 M TBA. Tubes were incubated in a boiling water bath for 1h and then cooled for 10min with cold tap water. Absorbance of the supernatant was measured at 532nm against a blank containing 5mL of 4% perchloric acid and 5mL of 0.02 M TBA solutions in a spectrophotometer (Shimadzu UV-1800). Standard curve was built using 1mM 1,1,3,3 tetraethoxy-propane stock solutions. Results were expressed as mg malondialdehyde (MDA)/kg meat. Surface meat color was determined using a reflectance spectrophotometer Minolta CM-700d (Minolta Camera Co, Osaka, Japan), with A light source and 10º observer angle. Lightness L*, redness a* and yellowness b* (CIE, 1978) were evaluated after keeping the samples for 30min at room temperature. Pork meat was analyzed for the total count of aerobic bacteria with Compact Dry® TC test method (R-Biopharm AG, Germany). Pork tissue (about 10g) in a sterile packaging was mixed with sterile peptone water (Britania® Argentina) until reaching 100g, and vigorously homogenized (Masticator, IUL Instruments) for 120s. The aqueous phase was serially diluted according to the increase in total aerobic counts number during storage (dilutions with sterile peptone were 10-3, 10-4, 10-5, 10-6). Sample preparation was carried out in a laminar flow chamber. Compact Dry® TC plates were inoculated with 1ml of the dilutions and incubated at 35°C for 48h. Results were expressed as log10 cfu/g. Two measurements were performed on each sample at each storage time.

Statistical analysis

The study followed a randomized complete block design (with 6 replications) in which each pork loin medallion steak was the experimental unit, being blocked by L. dorsi muscle. The effect of two factors: natural antioxidant (rosemary extract, ascorbic acid, rosemary extract + ascorbic acid and control) and storage time (0, 15, 30 and 45d) were evaluated by ANOVA (analysis of variance). The means of treatments were compared by Tukey’s test (p<0.05). Data were analyzed with Statgraphics Centurion XV (StatPoint Tech, Inc., Warrenton, VA, USA). Results are reported as mean value ± standard deviation (SD).

RESULTS AND DISCUSSION:

The pH values were significantly affected by storage time; however, antioxidants (especially AA with low pH) did not change them. Pork meat pH decreased at 45d of refrigerated storage compared with the initial value at 0d, with significant differences in AA and RE+AA (Table 1). BLIXT & BORCH (2002) reported similar behaviour in pork loin vacuum-packaged, where minimum pH value (5.2) was reached after 7 weeks of storage. The pH decrease during storage is partly attributed to the metabolite accumulation produced by lactic acid bacteria (DEMEYER et al., 1979), as they predominate in vacuum packaged meat (PIERSON et al., 1970). Lactobacillus development is encouraged by the oxygen-depleted condition in the evacuated package (BORCH et al., 1996). The pH of vacuum-packed meats is also affected by the carbon dioxide concentration present in the package, which is a metabolic by-product of microbial metabolism. Carbonic acid is formed when carbon dioxide produced by cellular respiration dissolves into the meat tissue, which acidifies the meat product (ADAMS et al., 2015). However, VIANA et al. (2005) did not observe modifications in the pH of pork L. dorsi muscle during 21 d of refrigerated storage under vacuum. APPLE et al. (2002) reported an increase of pH during vacuum storage of L. dorsi after 6 weeks.

Table 1 pH, moisture and drip loss values (means±SD) in pork L. dorsi steaks sprayed with natural antioxidants and packaged under vacuum during refrigerated storage (0, 15, 30, 45 d) at 4ºC. 

Time (d) Control Ascorbic acid Rosemary extract RE+AA
0 5.38±0.01aA* 5.37±0.03aA 5.38±0.02aA 5.39±0.03aA
pH 15 5.37±0.13aA 5.34±0.13abA 5.37±0.11aA 5.37±0.14aA
30 5.36±0.16aA 5.36±0.18abA 5.38±0.22aA 5.36±0.17abA
45 5.33±0.07aA 5.30±0.06bA 5.32±0.06aA 5.29±0.09bA
0 73.79±1.15aA 73.54±1.15aA 74.21±1.00aA 73.23±1.08aA
Moisture 15 72.97±0.81abA 73.15±1.01abA 73.63±0.85abA 72.97±0.33aA
(%) 30 73.42±0.82abA 72.98±1.53abA 73.15±0.66bA 73.00±0.42aA
45 72.89±1.03bA 72.49±1.08bA 72.83±0.47bA 72.75±0.99aA
15 5.0±1.6aA 4.5±0.3aA 5.3±1.6aA 5.0±1.7aA
Drip loss 30 5.4±0.3abA 5.3±1.6aA 5.6±0.6abA 5.1±1.0abA
(%) 45 6.3±1.8bA 5.8±1.4aA 6.8±1.4bA 6.2±1.1bA

*Means within columns and parameter with different lower case letters are significantly different; means within rows with different capital letters are significantly different (p<0.05). RE+AA: combination of rosemary extract and ascorbic acid.

Moisture and drip loss were significantly affected by storage time; the presence of antioxidants did not change drip loss and moisture. In terms of drip loss (Table 1) it was observed that samples initially (15d) have a high loss, with a smaller increase after 45d (although significant, except for AA). This could be caused by changes in pressure during the packaging process, as described by CAYUELA et al. (2004). These authors reported drip loss of 5.1% (2d) to 8.8% (after 20d) in vacuum-storage of pork chops. KNOX et al. (2008) found drip loss of 3.6% to 7.9% with various ultimate pH groups over 34d of storage at 4ºC in vacuum-packaged pork loins. JEREMIAH et al. (1995) reported drip loss of 4.7% in pork loin under vacuum after 6 weeks of storage at -1.5ºC. However APPLE et al. (2002) noticed that drip loss from loins remained relatively unchanged after 3 and 6 weeks of storage at 2ºC (0.5% to 2.3% approximately). As expected, moisture showed a similar behaviour to drip loss (Table 1). Pork meat samples diminished their water content after 45d of refrigerated storage under vacuum. Similarly, there are reported moisture values of 72.2% in pork loins after 6 weeks of storage at 2ºC under vacuum (APPLE et al., 2002).

Thiobarbituric acid reactive substances showed significant differences between antioxidants. TBARS values of pork meat sprayed with RE+AA or RE on the surface were significantly lower (p<0.05) than the control (Table 2) after 45d of storage, AA did not differ from the control. Therefore, the most effective treatments to delay lipid oxidation were RE+AA and RE. Similar results were reported by SÁNCHEZ-ESCALANTE et al. (2001) who reported that RE and RE+AA had a significant antioxidant effect during 20d storage and the addition of AA was completely ineffective in preventing lipid oxidation of beef patties packaged in modified atmosphere. DJENANE et al. (2002) sprayed vitamin E, taurine and RE, in combination with AA on fresh beef steaks packaged in modified atmosphere. These authors reported a significant decrease in TBARS values (about 50%) and concluded that RE in combination with AA was the most effective treatment in delaying myoglobin and lipid oxidation. DJENANE et al. (2003) investigated the effect of RE in combination with AA under UV-free lighting in beef steaks packaged in modified atmosphere. They concluded that the absence of UV radiation and the treatment with an antioxidant mixture of RE and AA significantly extended meat display life from about 10 days to about 20 days.

Table 2 TBARS (mg MDA/kg meat) in pork L. dorsi steaks (means±SD) sprayed with natural antioxidants and packaged under vacuum during refrigerated storage (0, 15, 30, 45 d) at 4ºC.  

Time (d) Control Ascorbic acid Rosemary extract RE+AA
0 0.71±0.10aA* 0.69±0.14aA 0.64±0.15aA 0.61±0.21aA
TBARS 15 0.73±0.12aA 0.68±0.12aA 0.63±0.07aA 0.61±0.17aA
30 0.71±0.06aA 0.71±0.15aA 0.63±0.07aA 0.62±0.15aA
45 0.79±0.10aA 0.72±0.12aAB 0.66±0.17aB 0.65±0.18aB

*Means within columns with different lower case letters are significantly different; means within rows with different capital letters are significantly different (p<0.05). RE+AA: combination of rosemary extract and ascorbic acid.

TBARS values did not change with storage time. CAYUELA et al. (2004) reported no differences in TBARS in pork L. dorsi muscle packaged under vacuum (without antioxidants) during 20d of refrigerated storage. Similar results were obtained by GODZISZEWSKA et al. (2017) in pork loin packaged under vacuum after 12 days of refrigerated storage.

Mean color measurements on pork steaks with or without spraying antioxidants during storage are shown in table 3. No significant effect of storage time or natural antioxidants on L* values were observed. Natural antioxidants did not affect a* and b* coordinates. However, a* and b* were significantly affected by storage time, as both color coordinates increased during storage. These results are consistent with other authors findings, HOLMER et al. (2009) reported a slight increase in a* and b* values from 0 to 28 d of storage, indicating that vacuum packaged pork becomes redder and more yellow over time. LINDAHL (2005) observed that storage under vacuum for 8-9 days increased lightness, redness and yellowness in pork muscles compared with samples preserved for 1-2 days. ROSENVOLD & ANDERSEN (2003) reported higher a* and b* values after 8d of vacuum storage of pork meat however, no differences in L* were found. FREDERICK et al. (2004) reported higher redness and yellowness but lower lightness in L. dorsi pork after 25 or 50 days under vacuum storage compared with 24 hour post-mortem muscle samples. BERIAIN et al. (2009) reported that a* and b* increased during 14 days of ageing in beef under vacuum, L* showed no significant effect remaining constant during this period.

Table 3 L*, a* and b* values (means±SD) in pork L. dorsi steaks sprayed with natural antioxidants and packaged under vacuum during refrigerated storage (0, 15, 30, 45 d) at 4ºC. 

Time (d) Control Ascorbic acid Rosemary extract RE+AA
0 56.60±7.74aA* 55.38±6.60aA 55.93±7.71aA 56.14±6.14aA
L* 15 56.17±3.97aA 57.52±3.76aA 55.10±4.56aA 55.22±4.20aA
30 53.03±1.93aA 53.42 ±2.53aA 51.84±2.43aA 54.43±4.18aA
45 56.25±4.28aA 56.69±3.58aA 55.23±4.77aA 57.29±4.69aA
0 9.23±1.49aA 9.62±1.67aA 9.68±1.62aA 9.75±1.29aA
a* 15 9.56±1.53abA 9.57±1.80aA 9.87±1.18abA 10.62±1.81abA
30 10.07±1.13bcA 9.59±0.56abA 10.50±0.84bcA 10.59±0.88bcA
45 11.06±1.95cA 11.20±1.69bA 11.39±2.11cA 11.52±1.24cA
0 9.37±2.22aA 9.64±2.50aA 10.49±2.56aA 10.50±2.22aA
b* 15 10.87±2.59abA 10.78±2.32abA 11.49±2.54abA 11.37±1.77abA
30 11.40±1.36bA 11.46±1.30bcA 12.03±1.71bA 12.25±1.69bA
45 11.98±1.98bA 12.75±2.00cA 12.65±2.64bA 12.87±1.14bA

*Means within columns and parameter with different lower case letters are significantly different; means within rows with different capital letters are significantly different (p<0.05). RE+AA: combination of rosemary extract and ascorbic acid.

Total aerobic counts (TAC) on pork steaks, with or without antioxidants during storage, are shown in figure 1. TAC was significantly affected by storage time; however, antioxidants did not affect them. Spraying with RE, AA and RE+AA on the surface of meat was not sufficient to delay the growth of total aerobic bacteria in pork vacuum packaged steaks up to 45 days in refrigerated storage. As for TAC, it was observed that it significantly increased during storage. The initial population was 4.2-4.4log cfu/g. Microbial counts increased steadily throughout storage, reaching 6.2-7.2log cfu/g after 45d. TAC values in excess of 107cfu/g detected on fresh meat suggests an incipient spoilage (ICMSF, 1986).

Figure 1 Total aerobic count (log cfu/g) in pork L. dorsi sprayed with natural antioxidants and packaged under vacuum during refrigerated storage (0, 15, 30, 45 d) at 4ºC. RE: Rosemary Extract; AA: Ascorbic Acid; RE+AA: combination of RE and AA. 

There is general agreement that the bacterial flora is dominated by lactic acid bacteria in vacuum packaging (PIERSON et al., 1970; BORCH et al., 1996). ZHAO et al. (2015) studied microbial composition in vacuum packaged chilled pork during 21 days of storage. These authors reported that abundance of Flavobacteriaceae on pork surface remained high during the first 7 days, but its abundance continuously decreased with longer storage times. Indeed Lactobacillaceae and Carnobacteriaceae were the major components of the microflora in vacuum packed chilled pork at day 14 and 21d of storage.

Taking into account natural antioxidant effectiveness, FERNÁNDEZ-LÓPEZ et al. (2005) have reported a non significant reduction of lactic acid bacteria counts in beef meatballs containing RE after 12 days of refrigerated storage and packaged with semi-permeable film. SÁNCHEZ-ESCALANTE et al. (2001) did not found antimicrobial effect of RE, AA or their combination in beef patties packaged in modified atmosphere and refrigerated during 20 days. OKAYAMA et al. (1987) treated beef loin steaks with AA and ethanol, and reported that there was no difference in the viable bacterial count with a treated with ethanol only control, after 13d of storage at 4ºC in hermetically sealed plastic containers. However, several authors have reported certain compounds present in the rosemary extract as responsible for antimicrobial activity. Non polar components such as phenolic diterpenes (responsible for the antimicrobial properties of rosemary) are generally considered effective only against Gram-positive bacteria (FERNÁNDEZ-LÓPEZ et al., 2005) like lactic acid. This behavior was not observed in the present study with RE or the combination of RE+AA.

CONCLUSION:

Pork meat surface sprayed with rosemary extract or a combination of rosemary extract and ascorbic acid exhibited lipid antioxidant activity during refrigerated stored. No effect of antioxidant addition on pH, color, drip loss, moisture or total aerobic count of vacuum-packed pork meat was observed during storage. These data suggested that spraying rosemary extract alone (4000ppm total phenols) or in combination with ascorbic acid (500ppm) on the surface of vacuum-packed fresh pork could be used as an antioxidant method.

ACKNOWLEDGEMENTS:

The authors wish to acknowledge Ms Alicia Noceti´s assistance with the English language editing. This research was funded by SCyT, Universidad Nacional de Entre Rios (UNER), Argentina.

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0CR-2017-0238.R2

CONFLICTThe authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Received: April 04, 2017; Accepted: February 05, 2018; Revised: March 08, 2018

E-mail: perlof@fcal.uner.edu.ar. *Corresponding author.

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