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Influence of energy removal rate on the quality of minced meat from undersized crawfish during frozen storage

Abstract

Undersized crawfish have little economic value and are often discarded. Producing crawfish minced meat (CMM) from undersized crawfish and using an appropriate freezing technique may enable an economically viable market. The objective of this research was to evaluate the effect of the energy removal rate using two techniques, cryogenic freezing (CF) and air blast freezing (BF), on CMM’s quality during frozen storage. CMM was separated into two batches; one batch was cryogenically frozen with liquid nitrogen and the other batch was frozen with an air blast freezer. CMM batches were frozen and stored at − 18 °C. They were analyzed for moisture content, color, pH, and lipid oxidation during 180 days of storage. The CMM yield was 64.67% of the total crawfish weight. Cryogenic freezing achieved the highest freezing rate. Cryogenically frozen CMM showed 22% less lipid oxidation than CMM frozen by air blast freezing at 180 days of storage. This study showed that CMM could be mechanically produced from undersized crawfish and freezing techniques with high energy removal rate could better maintain quality attributes for CMM during frozen storage.

Graphical abstract

Introduction

The Southern U.S. is characterized for being the largest crustacean farming area in the nation, with average annual production of 30 to 50 million pounds. Crawfish aquaculture in Louisiana is controlled by Procambarus clarkii (red swamp) and P. zonangulus (white river); however, the P. clarkii is the desired specie in the marketplace and the preferred species for culture. Louisiana is the biggest state in crawfish production, with 90% of the total annual production located in the southern part of the state (McClain and Romaire 2004; Romaire et al. 2004).

The offer of crawfish is highly seasonal, with the peak of the season occurring from March to June. Smaller crawfish are usually processed for the tail meat market, and the larger crawfish are designated for the more profitable live market. Thousands of small crawfish are not harvested because they are not acceptable for either processing or commercialization. The smallest grades are by-products of the grading process or discarded by the processing plant. Approximately 20% of the total crawfish produced in recent years are underutilized. A potential solution could be a frozen crawfish minced meat (CMM) to utilize those undersized crawfish for processed meat through value added products and increased distribution (Harrison et al. 2002; Romaire et al. 2005). Fresh crawfish, due to its elevated moisture and nutrient contents, is a highly perishable seafood product. The primary preservation technique is using low temperatures to help reduce rates of microbiological and chemical changes. Several researches have studied meat quality variations during refrigerated or frozen conditions (Dorsa et al. 1993; Godber et al. 1989; Tseng et al. 2002).

Freezing is a food preservation technique that has been used for thousands of years due to long storage times at low temperatures extending product quality (Persson and Londahl 1993).

These quality attributes could vary through the freezing process, including pre-freezing and the postfreezing conditions during storage (George 1993; Persson and Londahl 1993). Freezing influences changes on food products by the freezing rate, the frozen storage conditions, and the thawing rate (Jasper and Placzek 1980). The main changes during frozen seafood storage are lipid oxidation (Subramanian 2007), color changes (Rahman and Velez-Ruiz 2004), denaturation of protein (Simpson 1997), sublimation and recrystallization of ice (Bhobe and Pai 1986). These can lead to off flavor, lipid oxidation, drip loss, dehydration, and toughening (Bhobe and Pai 1986; Londahl 1997). Several freezing techniques have been used in the food industry, including air blast freezing (BF), cryogenic freezing (CF), plate freezing, and immersion freezing. However, the most adaptable and popular methods are BF and CF. One main difference between these two methods is related to freezing rate and its effect on product quality (Boonsumrej et al. 2007; Espinoza et al. 2013; Goswami 2010). Higher freezing rate is positively correlated with the number of ice crystals, producing small crystals that better retain the texture of some products. However, slow freezing is related with undesirable effects such as drip on thawing (Tung 2004). The aim of this study was to evaluate the effects of the energy removal rate on specific quality parameters of CMM during 6 months of frozen storage.

Materials and methods

Production, freezing, and storage of crawfish minced meat

Undersized, live, red swamp crawfish (Procambarus clarkii) kindly provided by Bocage Crawfish LLC (Crowley, LA), were stunned in ice, placed in boiling water for 5 min and cooled in ice slurry. Then meat and shells were mechanically separated by passing the whole crawfish through a belt drum deboner machine (Baader 693, Lübeck, Germany) at the Food Processing Pilot Plant, LSU AgCenter (Baton Rouge, LA). Schematic diagram for producing crawfish minced meat (CMM) is shown in Fig. 1. The resulting CMM was separated into two batches by packing the product into 946.35 mL capacity Ziploc bags (SC, Johnson, Racine, WI). One batch was frozen with liquid nitrogen in a pilot scale cabinet-type cryogenic freezer (Air Liquide, Houston, TX). Temperature was recorded by inserting a thermocouple into the center of the Ziploc bag with the CMM until the center of the product reached − 18.30 ± 1.84 °C (temperature was recorded at 2 s intervals). The temperature inside of the cryogenic freezer cabinet using liquid nitrogen was − 115.80 ± 1.13 °C. The other batch was frozen in an air blast freezer (ABF) (Environmental Growth Chambers, Chagrin Falls, OH) with a set point of − 18 °C. Temperature was recorded by inserting a U12 probe temperature data logger (HOBO, Bourne, MA) into the center of the Ziploc bag with the CMM until the center of the product reached − 18.32 ± 0.41 °C (temperature was recorded at 30 s intervals). The air flow rate (9.01 L s− 1) was provided by the freezer manufacturer. Both frozen batches were packed into Ziploc bags and kept in an ABF at − 18 °C during frozen storage. Moisture content, pH, lipid oxidation, and color were evaluated at 1, 30, 90 and 180 days of storage. Samples were defrosted at 4 °C before measurements for the different storage times. A total of 12 samples per freezing technique were used in this study and three samples were analyzed at each evaluation time.

Fig. 1
figure1

Schematic diagram for producing CMM

Proximate and minerals composition of crawfish minced meat

CMM was analyzed for moisture, protein, lipid, ash, and minerals content. Moisture content was determined according to AOAC (1995). Protein was analyzed using the Dumas method with a Leco TruSpec nitrogen analyzer, using 6.25 as conversion factor for performing protein content calculations and the mineral analysis was performed using inductively coupled plasma (ICP) analysis (Baker and Amacher 1982; Barnhisel and Bertsch 1982; Mehlich 1984) at the Soil Testing and Plant Analysis Laboratory, LSU AgCenter. Lipid content was obtained by the Soxhlet extraction method AOAC 960.39 ( 1995), and ash was analyzed according to AOAC (1999).

Crawfish minced meat’s energy removal rate

Measurement of energy removal rate (ERR) was done according to the methods of Espinoza et al. (2013). ERR of CMM was determined using the following equation:

$$ ERR=\Delta h/t $$
(1)

where ERR is the rate of heat transfer (kJ s − 1), Δh is the product heat load (kJ), and t is the freezing time (FT) for the CMM (s). FT was calculated using the internal temperature recorded of CMM for the two freezing techniques.

$$ \Delta h=m\left[{C}_{pu}\left({T}_o-{T}_{if}\right)+L+{C}_{pf}\left({T}_{if}-{T}_f\right)\right] $$
(2)

where Δh is the CMM heat load (kJ); m is the weight of frozen CMM (kg); Cpu is the specific heat capacity (kJ kg − 1 K − 1) of unfrozen CMM; Cpf is the specific heat capacity (kJ kg − 1 K − 1) of frozen CMM; To is the initial temperature of the CMM (5.6 °C for CF and 5.89 °C for BF); Tif is the initial freezing temperature and Tf is the final freezing temperature (− 18.40 °C for CF and − 18.36 °C for BF). The specific heat capacity (Cpu or Cpf) was calculated using Siebel (1982). Latent heat (L) was calculated using Eq. (3).

$$ L={x}_iL\hbox{'} $$
(3)

where L’ is the latent heat of fusion of water (333.6 kJ kg − 1) and xi is the weight fraction of ice. xi was calculated using Eq. (4).

$$ {x}_i=\left({x}_{wu}-{Bx}_s\right)\left[\left({T}_{if}-{T}_f\right)/\left({T}_o-{T}_f\right)\right] $$
(4)

where xwu is the weight fraction of water, xs is the weight fraction of solute, and B is kg bound water per kg solute. Bound water was calculated using Eq. (5).

$$ B=b-0.5\ \left({M}_w/{M}_s\right) $$
(5)

where Mw and Ms are the molecular weight of water and solutes, respectively. b is a constant (b = 0.1924) that was reported for fish species with similar composition to CMM by Pham (1987). The molecular weight of solutes was calculated using Eq. (6).

$$ {M}_s= 18.02\ \left[\right({X}_w\left( 1\hbox{-} {x}_{wu}\right)/\left({x}_{wu}\left( 1\hbox{-} {X}_w\right)\right] $$

where Xw is the mole fraction of water of CMM. Xw was calculated using Eq. (7).

$$ \mathit{\ln}\left({X}_w\right)=- 18.02\ \left[L\hbox{'}\left({T}_o-{T}_{if}\right)/\left({RT_o}^2\right)\right] $$
(7)

where R is the gas constant (8.314 kJ kmol − 1 K − 1) and temperature unit is in Kelvin. Freezing rate (FR)(°C min − 1) was estimated using Eq. (8).

$$ \mathrm{FR}=\left({\mathrm{T}}_{\mathrm{o}}\hbox{-} {\mathrm{T}}_{\mathrm{f}}\right)/\mathrm{t} $$
(8)

where t is the total FT (min). Three assumptions were defined for the above calculations: (1) water is the only constituent being frozen; (2) the internal temperature of CMM represents its average temperature; (3) all ice crystals are formed at the initial freezing temperature.

Moisture content, pH, thiobarbituric-acid-reactive-substances (TBARS), and color of crawfish minced meat

Moisture of CMM was determined according to AOAC (1995). The pH of CMM was obtained with the method described by Sundararajan et al. (2011). Thiobarbituric-acid-reactive-substances (TBARS) analysis was used to determine lipid oxidation of CMM during frozen storage and was carried out according to Lemon (1975).

Color was measured using a colorimeter (Labscan XE, Hunter Associates Laboratory, Inc., Reston, VA) and reported as L*, a* and b* values. The total color difference (ΔE*) between the fresh CMM and CMM at each of the different storage times was determined using Eq. (9). \( \Delta {\mathrm{E}}^{\ast }=\sqrt{{\left(\Delta {\mathrm{L}}^{\ast}\right)}^2+{\left(\Delta {\mathrm{a}}^{\ast}\right)}^2+{\left(\Delta {\mathrm{b}}^{\ast}\right)}^2} \) (9) where ΔL*, Δa*, and Δb* were the changes in L*, a*, and b* values between the fresh and stored CMM.

Statistical analysis

Statistical Analysis Systems software (SAS, Version 9.2) was used to analyze the data obtained from triplicate samples for the two freezing techniques treatments. To determine differences among freezing techniques treatments, one-way and two-way Analysis of variance and Tukey’s test were used at P < 0.05.

Results and discussion

Proximate analysis, minerals composition, and yield of crawfish minced meat

The proximate composition (%) of fresh CMM was moisture (86.09 ± 0.16), protein (9.30 ± 0.08), fat (2.29 ± 0.06), and ash (1.18 ± 0.03). The moisture content was higher than the one reported by Sidwell (1981) and USDA (2018) for boiled crawfish tails. Suvanich et al. (2000) reported that channel catfish frame mince had a moisture content of 83.70%, which is similar to that obtained for CMM. Asgharzadeh et al. (2010) found that washing fish minced muscle could increase its moisture content. In the present study, cooking the crawfish before mincing may have allowed for greater water binding and higher moisture content in the resulting CMM. Protein content in boiled crawfish tail meat reported by Sidwell (1981) and USDA (2018) was two times higher than CMM. Fat content was greater in CMM compared to boiled tail meat. The content from the cephalothorax, claws, and walking legs that was incorporated into the CMM might have increased the moisture and lipid content. Values of macro and microminerals present in CMM are shown in Table 1. Shellfish are characterized for Ca, Na, K, P, Fe, Zn, Se, and Cu contents (Ibironke et al. 2018; Venugopal and Gopakumar 2017). USDA (2018) reported the minerals present in boiled crawfish tail meat. Some variations in the mineral values are noticed when compared with our values. Iron, calcium and manganese content were higher in CMM than in boiled crawfish tail meat. However, phosphorus and potassium values were highest in the tail meat. Mineral discrepancies could be explained due to the CMM method extracted the content from the whole crawfish. The variations in proximate analyses of shellfish species according to Venugopal and Gopakumar (2017) are influenced by spawning cycle, gametogenesis, feed, season, and habitats. Crawfish yields were affected by harvest season and harvest type (trap or seine), normally the first harvest season reported greater tail meat yields. Trap harvested ponds yields were almost two times to the seine harvested ponds (D'Abramo and Niquette 1991). The CMM extraction method showed a yield (%) of 64.67 ± 0.79. This method to produce CMM for this study could be very advantageous to the crawfish industry due to the high yield compared to tail meat yield of 15% (Ozayan: Market analysis of new minced-meat products made from undersized crawfish, unpublished). CMM could be a potential ingredient for value added seafood products. The U.S. seafood industry processed around 18,358 Mg of fish products including fish sticks, fish nuggets, and seafood patties in 2000. U.S. imported approximately 6000 Mg of mince-based seafood during this same year (Harrison et al. 2002; U.S. Department of Commerce, N. O. A. A., and Administration 2001).

Table 1 Mineral content of crawfish minced meat

Freezing time, freezing rate, and energy removal rate for crawfish minced meat

Freezing prolongs quality, and has been the most popular preservation technique for several food products. This preservation method changes the liquid physical state of water’s product into ice, and the product reaches temperatures below the freezing point. (Rahman and Velez-Ruiz 2004). The freezing curves for CMM reported that freezing time was significantly different between the two freezing methods (Table 2). Cryogenic FT was approximately 44 times more rapid than the BF method to reach − 18 °C (final freezing temperature of CMM). Freezing systems can be categorized due to the energy required in determined time (freezing rate; FR) to covert ice from the surface to the center of the product. FR is influenced by the food properties and the efficiency of heat transfer, indicated by the heat transfer coefficient (h); h values are lower for BF (17–26 W (m2 K)− 1) compared to CF (100–140 W (m2 K)− 1) (George 1993).

Table 2 Freezing time, freezing rate, and energy removal of crawfish minced meat

CMM frozen by CF showed a sharper slope than CMM frozen by BF (Fig. 2). This steeper slope is explained by the greater h. It is due to direct contact of CMM with the liquid nitrogen gas, resulting in a high heat transfer rate (Awonorin 1989; Goswami 2010). FR and ERR of CF were higher than BF (P < 0.05). The proportion of FR and removal energy for CF to BF was around 55:1 and 44:1, respectively. Low FR and energy removal for BF could be due to the cold air having a lower h, prolonging holding times to reach the final temperature. Accordingly, FT is greatest for BF, normally measured in hours, while FT for the same products by CF are reported in minutes (Espinoza et al. 2013; George 1993).

Fig. 2
figure2

Freezing curves of crawfish minced meat. CF = cryogenic freezing and BF = air blast freezing

Ice crystal size is indirectly proportional with the amount of nuclei formed. At high FR’s, a substantial amount of nuclei are produced and the ice is dispersed in several tiny crystals. However, at low FR’s, minor nuclei are produced, resulting in large crystal sizes (Sun 2016). Rapid freezing rates help produce small ice crystals, reducing the amount of drip loss substantially and improving quality retention of the product compared to freezing methods with slow FR’s (Goswami 2010; Lakshmisha et al. 2008; Songsaeng et al. 2010).

Moisture content and pH of crawfish minced meat during frozen storage

Moisture content (g 100 g − 1) of CMM at day 1 of storage at − 18 °C was 86.29 ± 0.16 for minced crawfish blast frozen (MCBF) and 85.57 ± 0.30 for minced crawfish cryogenic frozen (MCCF) (Table 3). Within each respective treatment, the moisture content did not change from 1 to 180 days of storage. This suggests that both freezing techniques were adequate for retaining moisture in the minced meat during frozen storage. When comparing between both treatments, their moisture contents were similar from 90 to 180 days of storage. Similarly, Espinoza et al. (2013) found no differences between the moisture contents of air blast frozen and cryogenic frozen fish during 180 days at − 20 ± 1 °C.

Table 3 Moisture content, pH and TBARS of crawfish minced meat during frozen storage

The pH of CMM at day 1 of storage at − 18 °C was 7.75 ± 0.02 for MCBF and 7.79 ± 0.03 for MCCF (Table 3). Within respective treatments, the pH did not change from 1 to 180 days of storage. Asgharzadeh et al. (2010) found that the pH of silver carp mince stored for 180 days at − 18 °C did not change. The pH of fish may be used alongside other quality assessments as a tool to determine fish quality (Ruiz-Capillas and Moral 2001). A decrease in pH during the stages of early storage can be from lactic acid formation. Longer storage can increase the pH due to decomposition of dimethylamine from trimethylamine oxide and other products (Rodger et al. 1980). Endogenous enzymes found in some seafood can develop decomposition products, leading to degradation during frozen storage (Fellows 2009). The cooking process for crawfish may help to inactivate proteolytic enzymes such as those found in the hepatopancreas of crawfish (Marshall et al. 1987). Like with fish, a stable CMM pH during frozen storage could reflect retention of quality. The initial post mortem pH of fish typically differs from 5.4 to 7.2 (Grigorakis et al. 2003). However, a different seafood matrix, CMM, had a pH above those values. This may be partially due to the slightly alkaline pH (7.40 ± 0.03) of the water used for cooking and cooling the crawfish.

Lipid oxidation of crawfish minced meat during frozen storage

In seafood frozen storage, the most common type of lipid oxidation is autoxidation, including a reduced enzymatically derived oxidation (Schultz 1962). At 1 day of storage, the thiobarbituric-acid-reactive-substances (TBARS) content of MCCF (0.31 ± 0.01 mg MDA equiv. kg − 1) and MCBF (0.32 ± 0.02 mg MDA equiv. kg − 1) did not show significant difference (Table 3). Both treatments reported an increase of TBARS content from 30 to 180 days at − 18 °C (P < 0.05). MCCF showed at the end of storage lower TBARS content than for MCBF. The CF method reduced approximately 22% of TBARS content compared to BF during 6 months at − 18 °C. Equivalent results were observed in whole crawfish, catfish fillets, and Indian mackerel during frozen storage where freezing methods with high ERR and short FT reduced lipid oxidation (Espinoza et al. 2013; Godber et al. 1989; Lakshmisha et al. 2008). The consequence of slow freezing methods on lipid oxidation of CMM could be lead due to differing amounts of damage caused to membrane lipids, which could be reflected through decrease of phospholipids that could interact with enzymes and substrates, thus increasing oxidation in frozen seafood products (Awad et al. 1968; Wanous et al. 1989).

Color of crawfish minced meat during frozen storage

The first food quality parameter judged by a customer is its visual perception. Appearance analyses are used on food quality evaluation through processing and after processing (Doughikollaee 2012; Sáenz et al. 1993). Initial L* values for MCCF reported higher lightness than for MCBF (Table 4). This may be explained due to the high FR’s which normally lead to pale colors due to the small ice crystals that generate scattering of incident light (Sun 2016). L* values for CMM treatments showed a significant decrease through the storage times. Nevertheless, after 6 months of storage there were not significant differences between treatments. Additionally, color changes and particular modifications of lightness could be the outcome of protein denaturation (Doughikollaee 2012). Slight changes occurred in a* and b* values for the different CMM treatments during frozen storage. Fresh CMM color (L* = 47.2 ± 0.64, a* = 15.42 ± 0.19, and b* = 20.45 ± 0.39) was used to get the total color difference (ΔE*) for the different storage times. Marshall et al. (1988) reported similar values for freshly processed meat of red swamp crawfish, but b* values of fresh CMM were higher than freshly processed meat. CMM’s reddish color may be explained by addition of the pigment astaxanthin from the crawfish carapace through the method of extraction that employs pressure from belt to crawfish. There is no clear trend of color difference for the different treatments. MCBF total color difference showed significant difference at 1 day and 180 days of frozen storage. However, MCCF reported similar total color difference through frozen storage (P < 0.05). Freezing method could have an effect on ΔE* during storage, as similar results were reported by Espinoza et al. (2013).

Table 4 Color of crawfish minced meat during frozen storage

Conclusion

The rapid freezing method extended quality parameters of crawfish minced meat during frozen storage. Cryogenic freezing reduced lipid oxidation of crawfish minced meat by 22% compared to the slow freezing method (air blast freezing), and showed significant benefits such as high freezing rates and shorter freezing times. Color difference stability was reported for cryogenically frozen crawfish minced meat. Cryogenic freezing was superior to air blast freezing in yielding a frozen crawfish minced meat that could better withstand quality degradation during frozen storage. This research provides valuable information regarding the impact of processing and storage on the quality of a potentially marketable commodity obtained from undersized and underutilized crawfish.

Availability of data and materials

All data generated or analyzed during this study are included in this published article. Further details are available from the corresponding author on reasonable request.

Abbreviations

ABF:

Air blast freezer

BF:

Air blast freezing

CCM:

Crawfish minced meat

CF:

Cryogenic freezing

ERR:

Energy removal rate

FR:

Freezing rate

FT:

Freezing time

h :

heat transfer coefficient

MCBF:

Minced crawfish blast frozen

MCCF:

Minced crawfish cryogenic frozen

MDA:

Malondialdehyde

TBARS:

Thiobarbituric-acid-reactive-substances

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SS and FB designed the study. FB, VR and BD performed and obtained the data. FB and AC analyzed and interpreted the results. SS, FB, and AC wrote the article. All authors read and approved the final manuscript.

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Bonilla, F., Reyes, V., Chouljenko, A. et al. Influence of energy removal rate on the quality of minced meat from undersized crawfish during frozen storage. Food Prod Process and Nutr 2, 20 (2020). https://doi.org/10.1186/s43014-020-00033-x

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Keywords

  • Crawfish
  • Minced meat
  • Cryogenic freezing
  • Air blast freezing