ARTICLE

Influences of Red Pepper Seed Powder on the Physicochemical Properties of a Meat Emulsion Model System

Jeong-A Lee1,https://orcid.org/0000-0003-3019-8321, Gye-Woong Kim1,https://orcid.org/0000-0001-7325-9898, Hack-Youn Kim1,*https://orcid.org/0000-0001-5303-4595, Juhui Choe1,*https://orcid.org/0000-0003-4585-0327
Author Information & Copyright
1Department of Animal Resources Science, Kongju National University, Yesan 32439, Korea
*Corresponding author : Hack-Youn Kim, Department of Animal Resources Science, Kongju National University, Yesan 32439, Korea Tel: +82-41-330-1241 Fax: +82-41-330-1249 E-mail: kimhy@kongju.ac.kr
*Corresponding author : Juhui Choe, Department of Animal Resources Science, Kongju National University, Yesan 32439, Korea Tel: +82-41-330-1165 Fax: +82-41-330-1249 E-mail: cjh1641@gmail.com

These authors contributed equally to this work as joint first author.

© Korean Society for Food Science of Animal Resources. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Feb 26, 2019 ; Revised: Mar 25, 2019 ; Accepted: Mar 26, 2019

Published Online: Apr 30, 2019

Abstract

Red pepper seed (RPS) is commonly removed during the production of red pepper powder, which is contains large amounts of dietary fibers and is abundant in nutrients, readily available. In this study, we determined the effects of adding RPS powder on the physicochemical properties of emulsified meat products. Meat emulsion samples were prepared with pork hind leg meat (60%) and back fat (20%), iced water (20%), various additives, and RPS powder at different concentrations [0% (control), 1%, 2%, 3%, and 4%]. For the physicochemical properties, moisture and fat content, pH value, color, emulsion stability, cooking yield, appearance viscosity, and textural properties were examined. Addition of RPS induced significantly higher values in moisture content, pH, cooking yield, and a* values of the meat emulsion samples, regardless of the amount added. However, lower values were obtained for emulsion stability, cooking yield, and viscosity in samples with RPS powder at 3% or 4% among all groups. In general, addition of RPS powder at 1% and 2% led to the greatest values in viscosity of the meat emulsion samples. Higher values (p<0.05) in hardness and springiness were observed in samples with RPS powder at 4% and 3%, respectively. For gumminess, chewiness, and cohesiveness, the addition of RPS powder at 1%, 2%, and 3% induced the highest values (p<0.05) in the meat emulsion samples. These results showed that addition of RPS powder at optimum levels (2%) could be utilized to improve quality properties of emulsified meat products as a non-meat ingredient.

Keywords: red pepper seed powder; meat emulsion; rheological properties; physicochemical properties

Introduction

Red pepper (Capsicum annuum L.) is one of the most commonly consumed spices in Asian cuisine. In Korea, the red pepper is mostly consumed as a dried powder and the consumption per capita of which reached 3.7 kg in 2015 (Kim et al., 2017). In general, the seed of the red pepper is mostly removed prior to drying as a high seed content causes a deterioration in redness and in the flavor of the red pepper powder (Ku et al., 2008). However, the red pepper seed (RPS) contains 40%–65% dietary fiber (Lee and Kim, 2016) and has both antioxidant and antimutagenic activity (Sim and Han, 2007).

Dietary fiber is used in processed meat products, attributing both health benefits for the consumer and desirable qualities for the products including water holding/binding capacity, oil holding ability, and textural or sensory properties (Rafiq et al., 2018). In particular, viscosity is an important parameter in emulsified meat products due to its close relationship with water holding or retention capacity as measured by internal friction or resistance to flow (Bourne, 2002). Ding et al. (2018) observed that the addition of 1% chia seed powder exhibited enhanced the water holding capacity, presented lower purge and centrifugation loss, and had similar textural properties by panel compared to samples without. In addition, Kaur et al. (2015) found that chicken nuggets containing pomegranate seed powder exhibited desirable sensory properties but with no change in emulsion stability or moisture content. In another study, the addition of pomelo peel to chicken emulsion-type sausages led to remarkable increases in viscosity, emulsion stability, and moisture content in comparison to those without (Srithongkerd et al., 2018). As mentioned above, many authors tried to incorporate with dietary fiber obtained from agricultural by-products into meat products for enhancement in physicochemical properties (Choe et al., 2017; Selani et al., 2016). While many of these studies examined the effects of RPS powder on restructured or emulsified meat products for improvement of physiochemical properties, to our knowledge, rheological characteristics including emulsion stability and/or viscosity were not determined (Kim et al., 2013; Lee et al., 2016a; Lee et al., 2016b). Hence, the aim of this study was to determine the effects of RPS powder on the physicochemical properties of a meat emulsion model, including moisture and fat contents, pH values, instrumental color, cooking yield, emulsion stability, viscosity, and textural properties.

Materials and Methods

Preparation of RPS powder and meat emulsion samples

The RPS powder was purchased from a local market (Chungnam, Korea), sifted through a 35-mesh sieve, and stored at −20°C until use. To prepare the meat emulsion sample, the hind leg meat and back fat from pork were first purchased from a local butcher (Hongju meat Co., Chungnam, Korea). All subcutaneous and intramuscular fat and visible connective tissues were removed from the pork muscle; these were then cut and ground using an 8-mm plate grinder (PA-82, Mainca, Barcelona, Spain). Next, the ground meat (60%) was mixed with back fat (20%), iced water (20%), nitrite pickling salt (1.2%; nitrite content: 6,000 ppm), phosphate (0.3%), sugar (1%), mixed spice (0.6%; Bockworst, Raps GmbH & Co., Krombacher, Germany), and RPS powder at different concentrations [0% (control), 1%, 2%, 3%, and 4%] in a silent cutter (K-30, Talsa Co., Valencia, Spain). During the meat batter preparation, the temperature of the mixture was maintained below 10°C. The meat batter was then divided into two parts. One portion was used for measurement of pH values, color, cooking yield, emulsion stability, and viscosity, whereas the other portion was stuffed into a collagen casing (#240, NIPPI Inc., Tokyo, Japan; approximately 25-mm diameter) using a stuffer (EM-12, Manica, Barcelona, Spain) and cooked using a water bath (JSWB-30T, JSR, Gongju, Korea) at temperature 80±1°C until the internal temperature of the samples reached 75°C. The samples were subsequently cooled in iced water for 30 min, vacuum packed, and stored at 4°C until moisture and fat content, pH, color, and textural properties could be analyzed. All processing was performed in triplicate.

Measurement of moisture and fat contents

Moisture and fat contents of the cooked samples were determined using the method described by AOAC (2012). Moisture content (AOAC method 950.46B) was determined by measuring weight loss after 12 h of drying at 105°C in a drying oven (SW-90D, Sang Woo Scientific Co., Bucheon, Korea). Fat content (AOAC method 960.69) was determined using the Soxhlet method in a solvent extraction system (Soxtec® Avanti 2050 Auto System, Foss Tecator AB, Höganas, Sweden).

Determination of pH values and instrumental color

The pH values for a mixture of sausage samples and distilled water (1:4) were determined using a pH-meter (Model 340, Mettler-Toledo GmbH Analytical, Schwerzenbach, Switzerland). The cooking yield in each treatment was determined by weighing meat batters before and after cooking and expressed in percentage.

The color of the samples was examined using a colorimeter (CR-10, Minolta, Japan; illuminant C, calibrated with a white standard plate L*=97.83, a*=−0.43, and b*=+1.98), which had a measuring area with a diameter of 8-mm and an illumination area of 50 mm diameter. Color values (CIE L*, a*, and b*) were measured on the surface of samples with results taken in triplicate for each sample.

Determination of emulsion stability

The meat batter samples from each group were analyzed for emulsion stability using the method described by Choe et al. (2013). The 15-mesh sieve (with 50-mm diameter) was placed in the middle of a graduated glass tube. Approximately 25 g of the meat batter was weighed and placed on the sieve in glass tubes and covered. Triplicate samples from each group were cooked at 75±1°C for 30 min, followed by cooling to approximately 4±1°C in order to facilitate fat and water layer separation. The fluid water and fat, which separated well in the bottom of the graduated glass tube, were measured in milliliters and calculated as a percentage of the original weight of the batter.

Determination of cooking yield

The cooking yield of each group was determined by weighing meat batters before and after cooking and expressing this as a percentage.

Determination of apparent viscosity of the meat emulsion samples

The flow behavior and time dependence of the batters were investigated at 20±1°C using a parallel plate rotational viscometer (HAKKE Viscotester 500 R®, Thermo Electron Corporation, Karlsruhe, Germany). The batter allowed to equilibrate for 5 min at room temperature (23±3°C) and was tested using a standard cylinder sensor (SV-2). Time dependency of the batter viscosity was determined by measuring the apparent viscosity under a constant shear rate of 10/s for 60 s.

Texture profile analysis (TPA)

Cooked samples, cut into sections with a height of 25 mm and φ 16 mm diameter, were used in this study. A cylinder probe (φ 20 mm diameter) set attached to a Texture Analyzer (TA-XT2i, Stable Micro System Ltd., Surrey, UK) was used to examine the textural properties for each sample. The test conditions used in the study were as follows: stroke, 2 kg; test speed, 2.0 mm/s; and distance, 8 mm. The texture profile analysis (TPA) parameters, thus hardness (N), springiness, cohesiveness, gumminess (N), and chewiness (N) were collected.

Statistical analysis

All experiments were repeated three times. Statistical analysis was performed by one-way analysis of variance (ANOVA), and significant differences (p<0.05) were detected by Duncan’s multiple range test using SAS software (SAS, Release 9.3 for window, SAS Institute Inc., USA). The values are expressed as means SD.

Results and Discussion

Moisture and fat content

The addition of RPS powder to the meat emulsion significantly influenced the moisture and fat contents (Fig. 1). The amount of RPS powder added had no effect on the moisture contents (p>0.05), similar to the results of Lee and Kim (2016) for restructured meat products with RPS powder. Addition of RPS powder at levels higher than 3% led to a significant decrease in fat contents of samples compared to that of the control. Moreover, samples with 4% RPS powder showed the lowest (p<0.05; 12.2% reduction) fat contents among all the groups. This result may be linked to fat binding ability of RPS powder based on result of fat exudation which showed the highest (p<0.05) by addition of 4% RPS powder in emulsion samples (Fig. 2). Previous study observed moisture content was increased and fat content was decreased (weight percentage basis) in sausage samples as increasing addition level of oat bran which is soluble fiber (Chang and Carpenter, 1997). In hence, we speculated that PRS powder probably contains large amounts of soluble fiber.

kosfa-39-2-286.g1
Fig. 1. Moisture and fat contents of emulsion model sausages with red pepper seed powder. Bar (SD) was determined using three independent experiments each assayed in triplicates. a–c Means within different letters in each parameter indicate differences between treatments (p<0.05).
Download Original Figure
pH and color

The pH was affected both by the amount of RPS powder added and by heat treatment (Table 1). The higher (p<0.05) pH of samples with RPS powder were most probably caused by the pH value (pH 6.25) of the RPS powder alone. Interestingly, in this study, samples with 1% RPS powder showed the highest pH values among the samples containing RPS powder. After cooking, the pH had increased in all groups. This phenomenon may be due to the protonation of imidazole groups which could be exposed as a result of protein denaturation at the temperatures used for cooking (Tanford, 1968). Xiong et al. (1999) reported a different observation whereby meat batter with a higher pH than the isoelectric point (pI) rarely showed a pH increase after heat treatment.

Table 1. pH and color of uncooked and cooked emulsion model sausages with red pepper seed powder
Traits Addition levels of red pepper seed powder (%)
0 (control) 1 2 3 4
pH Uncooked 6.13±0.01d 6.20±0.02a 6.17±0.01b 6.14±0.01c 6.15±0.01c
Cooked 6.24±0.01d 6.32±0.01a 6.29±0.01b 6.26±0.01c 6.26±0.01c
Cooking yield 84.85±0.33c 87.53±0.42a 87.67±0.60a 87.55±0.44a 86.78±0.32b
Color Uncooked CIE L* 71.44±0.29b 72.04±0.29a 68.98±0.45c 69.08±0.18c 67.52±0.25d
CIE a* 7.42±0.38e 9.54±0.30d 11.30±0.60c 12.70±0.56b 14.32±0.41a
CIE b* 17.46±1.01e 21.56±0.42d 23.80±0.99c 26.36±1.54b 28.36±0.83a
Cooked CIE L* 73.86±0.79a 72.24±0.21b 70.82±0.24c 69.52±0.74d 68.18±0.76e
CIE a* 7.84±0.38e 10.06±0.33d 11.48±0.28c 13.16±0.58b 14.04±0.69a
CIE b* 14.30±0.35d 18.26±0.55c 20.16±0.36b 22.68±0.82a 23.24±0.99a

All values are mean±SD.

a–e Mean in the same row with different letters are significantly different (p<0.05).

Download Excel Table

The color of meat and meat products has a large influence on consumers purchasing decisions, and is therefore an important parameter (Choe et al., 2017). In this study, it was found that the addition of RPS powder and the amount added resulted in a change of color (L*, a*, and b*) (Table 1). In general, in all samples, by increasing the amount of RPS added, L* values decreased and a* and b* values increased (p<0.05), regardless of cooking. Similar results have been observed in sausages where significant decreases of L* values were related to an increase in apple and orange fiber concentration (Garcia, 2007). In this study, the increase in a* and b* values was probably caused by the intrinsic color of the RPS powder (L*, 53.50; a*, 24.46; b*, 22.10). Based on these results, incorporation of RPS powder into meat products can lead to a positive change in a* values, whilst to a negative change in b* values.

Emulsion stability and cooking yield

Emulsion stability is critically affected by the properties of proteins, water and fat retention or absorption capacity of non-meat ingredients in emulsified products (Haque et al., 2016; Zorba and Kurt, 2006). In addition, the pH values of samples can influence emulsification and the functional characteristics of emulsion; pH values further away from the pI possess greater emulsifying stability (Cheftel et al., 1985; Zorba and Kurt, 2006). In this study, regarding non-meat ingredients, water and fat exudation were dependent on the amount of RPS powder added (Fig. 2). Among the groups, significantly lower values of water and fat exudation were observed in emulsified samples containing 2% RPS powder. Additionally, the addition of 3% RPS powder showed decreased (p<0.05) in fat exudation. The addition of RPS powder at higher levels (4%) induced an increase in water and fat exudation. These results indicate that the addition RPS powder at optimum levels (2% or 3%) forms a matrix which may be effective at holding or absorbing water and fat during protein gelation. The emulsion stability of samples is closely related with cooking yield loss. According to Surh et al. (2006), emulsified samples with high stability showed low levels of water and fat exudation during cooking, hence presenting highly sought after properties. In this study, the cooking yield of samples was affected by the addition of RPS powder and the amount added (Table 1). The lowest (p<0.05) cooking yield was observed in samples without RPS powder while significant differences in yields were not observed among the groups with RPS powder at amounts up to 3%, with 3% RPS powder exhibiting the highest cooking yield. A similar trend to that of the emulsion stability analysis was observed in that the higher level (4%) of RPS powder added led to a deterioration in the water holding capacity of the samples and therefore a lower cooking yield.

kosfa-39-2-286.g2
Fig. 2. Emulsion stability of emulsion model sausages with red pepper seed powder. Bar (SD) was determined using three independent experiments each assayed in triplicates. a–c Means within different letters in each parameter indicate differences between treatments (p<0.05).
Download Original Figure
Apparent viscosity of the meat emulsion samples

The apparent viscosity of the meat emulsion samples, which ranged from 47.5 to 128.29 Pa•s, decreased with increasing rotation time (Fig. 3). The samples without RPS powder had the lowest values (p<0.05) up until 30 s while, thereafter, samples with RPS powder added at 0% and 4% had the lowest values (p<0.05) of apparent viscosity. In general, the addition of RPS powder at 1%, 2%, and 3% led to the similar values (p>0.05) in apparent viscosity of the meat emulsion samples. In general, the addition of dietary fiber brought about an increase in viscosity in bologna samples regarding many fibers possess high fat absorption ability and WHC (Claus and Hunt, 1991; Saricoban et al., 2010). However, in this study, the addition of RPS powder at 4% induced decline in viscosity compared to samples with RPS powder at 1%, 2%, 3%, which was probably affected by the poor fat absorption ability (based on fat content) as adding large amounts of RPS powder. Furthermore, according to Dhingra et al. (2012), incorporation of fiber with highly branched or short chain polymer can lead to low viscosity depending on addition level, although having high WHC. Like emulsion stability, viscosity of meat emulsion can change depending on the water-holding capacity of non-meat ingredients including dietary fiber. Choe et al. (2013) showed a negative correlation between viscosity and cooking loss (r2=0.8305) in meat batter samples with wheat fiber and pork skin. Similarly, in this study, viscosity of the emulsion samples exhibited positive correlation with cooking yield [r2=0.8291; Fig. 4A].

kosfa-39-2-286.g3
Fig. 3. Apparent viscosity of meat emulsion with red pepper seed powder.
Download Original Figure
kosfa-39-2-286.g4
Fig. 4. Relationship between viscosity and each parameter [(A) cooking yield, (B) hardness, (C) cohesiveness] of meat emulsion with red pepper seed powder.
Download Original Figure
TPA

As shown in Table 2, textural properties (hardness, springiness, gumminess, chewiness, and cohesiveness) were partially affected by addition of RPS powder and by the amount added. Textural properties are important parameters for consumer preference and are closely related to the viscosity of emulsion samples. A previous study reported that high-viscosity meat batter exhibited greater textural properties, except for springiness (Choe et al., 2013). In this study, higher values (p<0.05) in hardness and springiness were observed in samples with RPS powder at 4% and 3%, respectively. This result partially agreed with the finding of several authors who reported that hardness is generally increased as decreasing in fat content in meat emulsion consisting of same meat protein content (Colmenero et al., 1995; Lee et al., 1987). For gumminess, chewiness, and cohesiveness, the addition of RPS powder at 1%, 2%, and 3% showed the highest values (p<0.05). Furthermore, positive correlations between viscosity and hardness [r2=0.7444; Fig. 4B] and viscosity and cohesiveness [r2=0.7118; Fig. 4C] were observed in the emulsion samples. The relatively lower correlation coefficients herein were presented than that between viscosity and cooking yield.

Table 2. Texture properties of emulsion model sausages with red pepper seed powder
Traits Addition levels of red pepper seed powder (%)
0 (control) 1 2 3 4
Hardness (N) 49.7±1.96b 53.3±3.04ab 55.2±4.70b 56.0±2.06ab 57.6±5.88a
Springiness 0.93±0.01b 0.94±0.02ab 0.95±0.02a 0.93±0.01b 0.94±0.02ab
Gumminess (N) 8.5±1.18b 11.8±0.69a 12.0±1.18a 10.0±0.69b 12.8±1.18a
Chewiness (N) 7.9±1.08b 11.2±0.59a 11.4±1.08a 9.4±0.78b 12.1±1.08a
Cohesiveness 0.17±0.02b 0.22±0.02a 0.22±0.01a 0.18±0.01b 0.22±0.01a

All values are mean±SD.

a,b Mean in the same row with different letters are significantly different (p<0.05).

Download Excel Table

Conclusion

Based on the results of this study, addition of the optimum amount of RPS powder (2%) to emulsified meat products would lead to an enhancement in the quality of characteristics associated with these products. In particular, addition of 1% RPS powder would have a potent effect on the color of meat products due to its bright red color and acceptable increase in yellowness.

Notes

Conflicts of Interest

The authors declare no potential conflict of interest.

Acknowledgments

This research was supported by Mars Korea Co., Ltd.

Notes

Author Contributions

Conceptualization: Kim HY. Data curation: Lee JA, Choe J. Formal analysis: Kim GW. Software: Kim HY. Validation: Kim GW. Writing - original draft: Lee JA, Choe J. Writing - review & editing: Lee JA, Kim GW, Choe J, Kim HY.

Notes

Ethics Approval

This article does not require IRB/IACUC approval because there are no human and animal participants.

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Journal Title Change

We announce that the title of our journal and related information were changed as below from January, 2019.

 

Before (~2018.12)

After (2019.01~)

Journal Title

Korean Journal for Food Science of Animal Resources

Food Science of Animal Resources

Journal Abbreviation

Korean J. Food Sci. An.

Food Sci. Anim. Resour.

eISSN

2234-246X

2636-0780

pISSN

1225-8563

2636-0772

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http://www.kosfaj.org

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