Monika Michalak-Majewska1*, Siemowit Muszyński2, Bartosz
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ACTAACTA UNIVERSITATISUNIVERSITATIS CIBINIENSISCIBINIENSIS 10.2478/aucft-2020-0009 SeriesSeries E:E: FoodFood technology technology COMPARATIVE ANALYSIS OF SELECTED PHYSICOCHEMICAL AND TEXTURAL PROPERTIES OF BREAD SUBSTITUTES – Research paper – Monika MICHALAK-MAJEWSKA*1, Siemowit MUSZYŃSKI**, Bartosz SOŁOWIEJ***, Wojciech RADZKI*, Waldemar GUSTAW*, Katarzyna SKRZYPCZAK*, Piotr STANIKOWSKI* *Department of Plant Food Technology and Gastronomy, Faculty of Food Sciences and Biotechnology, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, Poland **Department of Biophysics, Faculty of Environmental Biology, University of Life Sciences in Lublin, Akademicka 13, 20-950 Lublin, Poland ***Department of Milk Technology and Hydrocolloids, Faculty of Food Sciences and Biotechnology, University of Life Sciences in Lublin, Skromna 8, 20-704 Lublin, Poland Abstract: In the present study, the physicochemical, textural and sensorial properties of crackerbread (made from rye, maize and wheat flour) and rice waffles, the most popular on the Polish market bread substitutes, were determined. It was shown that values of several mechanical properties of rice waffles, including ultimate fracture force, strain and stress differed significantly from that of crackerbread. Texture profile analysis showed that the highest hardness and springiness was exhibited by rice waffles with sesame seeds and wheat-rye, respectively. The concentration of salt was the lowest in rice bread with sunflower. The most acceptable was the rice bread with sea salt (8.26 in a 9-point scale) and overall consumer acceptance of crispbreads was highly correlated with sensory attribute of saltiness. Keywords: bread substitute, crispbread, rice waffles, texture, sensory INTRODUCTION tional and health value to some consumers (Jarosz, In recent years, the consumption of traditional bread 2015). Besides, it is characterized by prolonged has been decreased, whereas different types of stability and convenient use. Additionally, crispbread classified into ready-to-eat snack crispbread is prepared in the process of extrusion, products, have become more popular (Brennan et which ensures a prolonged stability and convenient al., 2013). Bread consumption patterns differ widely use. Extrusion is a process that combines mixing, within the Europe, but most countries have an forming, texturizing and cooking of raw material average consumption of 50 kg of bread per person into food product (Bordoloi and Ganguly, 2014). annually. The highest consumption levels are However, numerous studies have discussed the role recorded in Bulgaria (approx. 95 kg), although the of extrusion technology in altering the heat-labile lowest is in UK (approx. 32 kg). In Poland, vitamins, minerals, fiber or bioactive ingredients consumption of bread (per capita) declined to 47 kg (Brennan et al., 2013). In addition, many of in 2017 – half of the consumption recorded at the extruded food products are relatively abundant in end of the 1990s. According to data reported by the sugar and salt, thus being regarded as energy dense Euromonitor International, sales of bread but nutritionally poor foods exhibiting high substitutes (crackerbread, breadsticks, rice waffles, glycemic index (GI) (Bator et al., 2014; Brennan et biscuits, toast) will continue to grow in upcoming al., 2013). Moreover, research has also suggested years (Euromonitor, 2018). that crispbread could be a considerable source of the Many of these products are enriched with vitamins, acrylamide and 5-hydroxymethylfurfural in a minerals and additives such as sunflower, sesame, modern diet (Michalak et al., 2016). These amaranth, making them a synonym of high nutri- chemicals can be toxic, mutagenic and carcinogenic to humans (Capuano and Fogliano, 2011). Received: 10.01.2020 Extruded crispbread belongs to the group of Accepted in revised form: 27.04.2020 products, for which their physical properties, 1 Corresponding author. E-Mail address: [email protected] Acta Universitatis Cibiniensis Series E: FOOD TECHNOLOGY 99 Vol. XXIV (2020), no. 1 including porosity and mechanical properties, are crispbread products, the most popular on the Polish very important, because they form the texture of a market, determining their selected physical, textural product. These features are an essential factor and chemical properties. In addition, their sensory influencing the consumer acceptability of a final properties and acceptability were analyzed. The product (Heiniö et al., 2016; Saeleaw and obtained results will be useful to predict the Schleining, 2011). nutritional value of commercially-available Taking into account the current popularity of assortments of crispbreads. crispbread, authors decided to test ten different MATERIALS AND METHODS specific surface area asp of adsorbent was calculated according to Langmuir’s model (Figura and Bread samples Teixeira, 2007). Commercial assortments of ready-to-eat bread substitutes (crispbread) available in the retail Water solubility index (WSI) and water network in Lublin (Poland) in 2019 were used in absorption index (WAI) this work. Seven assortments of crispbread known WSI and WAI were measured using the centrifuge as crackerbread: rye-wheat (RW), rye-maize (RM), method according to procedure described by wheat-rye (WR), rye-maize-wheat (RMW), rye- Rzedzicki et al. (2008). The measurements were spelled (RS), rye (R), rye-wheat-oat (RWO); and 3 taken in five replications. assortments of rice waffles known as puffed rice cakes: rice with sunflower (RS’), rice with sesame Extruded crispbread strength analysis and seeds (RSS’), rice with sea salt (RSS”), were calculations of mechanical parameters analyzed. The examined sample sets were prepared The three-point bending test was performed to from three packets of each type of bread purchased determine the mechanical properties of crispbread in three different stores. samples. Breads were loaded with the loading rate of 0.1 mm/s; the span length was set to 55 mm. Tests Physical analysis were performed on a TA.XT2i texture analyzer Measurements of the true and apparent densities (Stable Micro System, UK). Crispbread structural and porosity properties (ultimate force, deflection at fracture, The apparent (bulk) and true (material) densities stiffness, and work to break) were determined from were measured by a GeoPyc 1360 dry flow and an the force-displacement curves using Origin 2016 AccuPyc 1330 helium gas pycnometers, software (OriginLab, USA). Material properties of respectively. The parameters and procedures are the crispbread samples (Young modulus of described by Muszyński et al. (2016). Based on the elasticity, ultimate strain, ultimate stress) were measurements, porosity and specific pore volume calculated using appropriate engineering beam- were calculated. All measurements were performed theory equations (Moore et al., 1990). in five replicates. Volume of 100 g of bread Moisture content and water activity The measurement was carried out by means of Moisture content and water activity (aw) were millet seed displacement method (AACC, 2010) determined on freshly unpacked bread slices. and was expressed in cm3 of 100 g of crispbread. Moisture content was determined according to the Polish Standard (PN-84/A-8636). The aw was Texture profile analysis (TPA) measured using the Hygrometer 3 water activity Measurements were performed using a TA.XT2i meter (Rotronic, Switzerland) in six replicates for texture analyzer. The samples cut from the middle each bread type (Sołowiej et al., 2015). part of the crispbread (cylindrical, 30 mm in diameter) were double compressed to 50% of Determination of sorption isotherms deformation by a testing set (35 mm diameter) The equilibrium moisture content of bread samples according to the protocol described by Michalak- was determined at 20°C using the static gravimetric Majewska et al. (2017). Crispbread samples were method according to the procedures and conditions evaluated for hardness, fracturability, springiness described by Oniszczuk et al. (2015). The moisture and cohesiveness using Texture Expert software. adsorption data were fitted using Guggenheim- Five measurements were carried out for each Anderson-De Boer (GAB) model with TableCurve samples and average values were reported. 2D software (SYSTAT Software Inc, USA). The Michalak-Majewska et al., Comparative analysis of selected physicochemical and textural 100 properties of bread substitutes Cutting test saltiness. Rating scales were: hardness (1 = very Measurements were performed applying the soft; 9 = very hard), crispness (1 = non-crispy; 9 = analyzer mentioned above. The crispbread samples very crispy), adhesiveness (1 = non-adhesive; 9 = were cut by a testing set (100 mm). The rate of very sticky), saltiness (1 = low saltiness; 9 = high penetration was 1 mm/s. There were three saltiness). Furthermore, samples were evaluated for measurements for each treatment. consumer acceptability (desirability) using a 9-point hedonic scale (1 = extremely disliked; 5 = neither Chemical analysis liked nor disliked; 9 = extremely liked) (Meilgaard Water content, total titratable acidity and sodium and Civille, 2007). chloride (NaCl) in crispbread samples were measured by reference method for analysis of Statistical analysis bakery (PN-A-74108:1996; Serna-Saldivar, 2012). All results are expressed as means ± SD (standard deviation). To detect any significant difference Sensory analysis between the groups, one-way analysis of variance Sensory evaluation of crispbread was