Effect of fat-type on cookie dough and cookie quality

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    ing the oil showed more resistance to mixing while the other containing the bakery fat decreased in its consistency denoting the softernature of the later. The cookies containing the oil had relatively higher spread value than the others. While the cookies containing the

    dough (Maache-Rezzoug, Bouvier, Allaf, & Patras,1998). It also prevents excessive development of the gluten

    of dough and shrinking of the dough during moulding(Maache-Rezzoug et al., 1998). The type and amount of

    is a crucial structure component. Increasing the level of fatin short doughs has a softening eect on the consistency of

    creamed with sugar to incorporate air bubbles that aretrapped in the liquid phase of the shortening. Shorteningto be eective must possess plastic properties which arein turn exemplied by the correct solid-to-liquid index atdough mixing temperature. Solid fat index (SFI) denotesthe proportion of solid to liquid fat in a shortening at a

    * Corresponding author. Tel.: +91 0821 2517730; fax: +91 08212517233.

    E-mail address: leelarau@yahoo.co.uk (K. Leelavathi).

    Journal of Food Engineering 7proteins during mixing. Fat imparts desirable eating qual-ities and contributes to texture and avour of the product.The addition of shortening is done principally to stabilizeair cells that are generated by mixing (Given, 1994). Fatinuences the dough machinability during processing, thedough spread after cutting out, and textural and gustatoryqualities of the biscuits after baking (Vettern, 1984). Pres-ence of fat contributes to the reduction of elastic nature

    the dough (Miller, 1985).The shortening that are used in bakery products range in

    their consistency from liquid oils to high melting pointplastic fats. The only dierence between a fat and an edibleoil is that at ambient temperature, a fat is semi-solid, andappears more or less rm to the touch, and an oil is inliquid form. They are both of similar chemical composition(Manley, 1998). In cookie production plastic shortening isnon-emulsied hydrogenated fat (dalda) had the least spread. Studies also showed that the cookies containing the oil started to spreadearlier and continued to spread for a longer time. Cookies containing oil had relatively harder texture and probably so because of thepoor entrapment of air during creaming. However, the quality of these cookies was signicantly improved by including 0.5% sodiumsteroyl lactylate in the formulation. 2006 Elsevier Ltd. All rights reserved.

    Keywords: Cookies; Shortening; Fat; Set-time; Cookie spread; Farinograph consistency

    1. Introduction

    Fat forms one of the basic components of a cookie for-mulation and is present at relatively high levels. Fat acts asa lubricant and contributes to the plasticity of the cookie

    fat added to the dough has a strong eect on the viscoelas-tic properties (Baltsavias, Jurgens, & van Vliet, 1997).Baltsavias et al. (1997) also reported that reducing the fatcontent or substituting liquid oil for solid caused a markeddecrease in the stiness of the dough which implies that fatEect of fat-type on cooki

    Jissy Jacob, K

    Flour Milling, Baking and Confectionery Technology, Centra

    Received 6 June 2005;Available onlin

    Abstract

    Eect of four dierent fat types on the rheology of the cookie doied. The dough containing sunower oil had the least initial farinothe most consistency. Observation of the response of the above two0260-8774/$ - see front matter 2006 Elsevier Ltd. All rights reserved.doi:10.1016/j.jfoodeng.2006.01.058dough and cookie quality

    Leelavathi *

    ood Technological Research Institute, Mysore 570020, India

    pted 23 January 20060 March 2006

    h and subsequently their eect on the quality of cookies were stud-ph consistency while that containing the bakery fat (marvo) hadokies doughs to farinograph mixing showed that the one contain-

    www.elsevier.com/locate/jfoodeng

    9 (2007) 299305

  • Fogiven temperature and has an important relationship to theperformance of the product at that temperature. High SFIshortenings do not have enough oil volume for adequateaeration, and low SFI shortenings do not have the abilityto hold the air until mixing is complete (OBrien, 2004).The presence of some solid fat during mixing is thoughtto be essential and the use of liquid oil is reported to haveadverse changes in the handling characteristics of thedough (Abboud, Rubenthaler, & Hoseney, 1985). Anothercharacteristics of fat is its crystalline nature. The threebasic polymorphs are designated a, b and b (Bailey,1950). It is essential for the fat to be in the b crystal formto promote optimum creaming (Baldwin, Baldry, & Johan-sen, 1972). Utilization of emulsied bakery shorteninghelps in the ne dispersion of the fat in the batter or doughsystem as compared to non-emulsied shortenings (Pyler,1988).

    The main objective of the present work was to study theeect of four such commercially available fats on cookiequality. The fats selected were, an emulsied bakery fatmarvo, specially designed for cookie and biscuit produc-tion; margarine, an emulsied fat manufactured to resem-ble butter; a non-emulsied hydrogenated vegetable fatdalda, and a non-emulsied rened sunower oil.Rened sunower oil was selected because of its high nutri-tional value. Sunower oil seeds are rich source of linoleicacid, which is one of the nutritionally essential fatty acids.The study included the eect of these four type of fats onthe rheology of the cookie dough and consequently onthe quality of the cookies.

    2. Materials and methods

    2.1. Materials

    Commercially available rened wheat our was usedfor the preparation of sugar-snap cookies. Four types ofcommercially available fats were used in the formulation.These were, an emulsied bakery shortening marvo(M/s. Hindustan Lever Ltd., India), an emulsied marga-rine (M/s. Hindustan Lever Ltd., India), non-emulsiedvegetable hydrogenated fat -dalda (manufactured byBunge Agribusiness Pvt, Ltd., India), and sunower oil(ITC Agrotech Ltd., India). Commercially available sugarpowder, non-fat dry milk (NFDM), and food gradesodium chloride, dextrose, sodium steroyl lactylate (SSL),sodium bicarbonate and ammonium chloride were usedin the formulation.

    2.2. Methods

    2.2.1. Chemical and rheological characteristics of wheat our

    Wheat our was analyzed for moisture (4419), ash (0801), protein (4612), gluten (3810), falling number (5681b), diastatic activity (760A), and Farinograph water

    300 J. Jacob, K. Leelavathi / Journal ofabsorption (5421) according to standard AACC proce-dures (1995).2.2.2. Rheological characteristic of cookie dough

    Cookie dough was prepared in a Hobart mixer accord-ing to AACC micro method (1052, 1995). The cookie for-mulation consisted of wheat our 40.0 g, sugar powder24.0 g, shortening 12.0 g, NFDM 1.20 g, sodium bicarbon-ate 0.32 g, ammonium chloride 0.20 g, sodium chloride0.18 g and water according to requirement. Consistencyof the cookie dough as inuenced by dierent types of fatswas measured using Brabender Farinograph accordingOlewnik and Kulp (1984). Three hundred grams capacitymixer bowl was used in the experiment and the third leverposition was used to measure the cookie consistency. Themixing speed of the farinograph was 61 rpm. Three hun-dred grams of the pre-mixed cookie dough was transferredto the farinograph bowl and the farinograph was run for10 min. Cookie dough consistency was recorded at 0 and10 min mixing periods respectively. The above experimentswere conducted at ambient temperatures.

    2.2.3. Texture of the cookie dough

    The textural characteristics of the cookie dough weremeasured in Instron Universal Testing machine (Model4301) using an aluminum plunger with 6.0 cm diameter.The load cell used was 50 kg and the crosshead speedwas 10 mm/min with a clearance of 1.5 cm. Cookie doughpiece of 4 cm diameter and 1 cm height was used to mea-sure the texture. The force required to compress the doughby 80% was recorded and the average value of six replicatesis reported. The above experiments were conducted atambient temperatures.

    2.2.4. Cookie preparation and evaluation

    Cookies containing four dierent fats respectively wereprepared according to AACC micro method (No. 1052,1995). The cookie dough was sheeted to a thickness of0.5 cm and cut using a circular die of 6.5 cm diameter.Cookies were baked at 205 C. Cookies were subjectivelyevaluated for thickness, spread, spread ratio, texture andsurface cracking pattern. The breaking strength was mea-sured using the triple beam snap technique of Gains(1991) using Instron Universal Testing machine (Model4301) at a crosshead speed of 50 mm/min and load cell of250 kg. Force required to break a single cookie wasrecorded and the average value of six replicates is reported.

    2.2.5. Statistical analysisThe results were analyzed statistically using Duncans

    New Multiple Range Test (Duncan, 1955).

    3. Results and discussion

    The rened wheat our used in the study had moisturecontent of 11.9% and protein content of 9.7% respectively.The our had an ash content of 0.43% and dry gluten con-tent of 7.13%. The falling number of the our was 439 s

    od Engineering 79 (2007) 299305and the diastatic activity was 408 g maltose/10 g our.Flour had Farinograph water absorption of 59.6%.

  • 3.1. Measurement of the cookie dough consistency

    The farinograph dough consistency and the farinographbandwidth of the pre-mixed cookie dough were recorded at0 and 10 min mixing respectively (Table 1 and Fig. 1). Thehorizontal position of the band on the chart is considered ameasure of consistency (resistance to movement), with lar-ger numbers (BU) indicating stier dough and the band-width is considered to denote the degree of tenacityproperties of doughs (Olewnik & Kulp, 1984). The resultshowed that the cookie dough containing the sunoweroil had the least initial consistency of 200 BU, whichincreased to 400 BU with continued mixing in the farino-graph. The initial bandwidth of this farinogram was rela-tively narrow at 20 BU. With continued mixing however,the bandwidth increased to 120 BU. This denotes that thedough containing the oil, even though, was less sti ini-tially, became relatively more sti and tenacious with con-tinued mixing. Subjective observation during doughpreparation showed that mixing of oil, sugar and waterformed a very smooth and less aerated thin paste and whenour was added to the above cream it transformed intodough quite easily. Olewnik and Kulp (1984) infer thatphysical properties of cookie dough depend on the distri-bution of fat and water in the system and when fat is poorlydistributed in the cookie system our particles remainaccessible to water which results in development of gluten

    J. Jacob, K. Leelavathi / Journal of FoTable 1Eect of fat type on the farinograph consistency of cookie dough

    Fat type Farinograph dough consistency(BU)

    0 (min) 10 (min)

    Bakery fat (Marvo) 440 360Margarine 380 270Hydrogenated fat (dalda) 310 300Sunower oil 200 400

    Fig. 1. Eect of: (1) bakery fat (marvo), (2) margarine, (3) non-emulsied

    hydrogenated fat (dalda), and (4) sunower oil, on Farinograph charac-teristics of cookie dough.proteins. Maache-Rezzoug et al. (1998) explain that it isonly when fat is mixed with our before hydration, thatit prevents the formation of a gluten network and produceless elastic dough. When liquid oils are used in a dough sys-tem it gets dispersed on mixing through out the dough inthe form of minutes globules which are far less eectivein their shortening and aerative actions than are plasticfat lms (Pyler, 1988). It is possible that when sunoweroil was used in the present study, it lacked the ability tosmear all the our particles and therefore had the tendencyfor gluten protein to develop during the mixing resulting inan increase in the consistency of the dough. Developmentof gluten proteins would also make the dough elastic,which oers resistance to mixing resulting in wider bandwidth. It can also be speculated here that the cookie doughcontaining oil was less aerated because unlike the solid orplastic fats liquid oil do not aid in aeration of the doughor batter in which they are present (Pyler, 1988). Doughdensity depends on the type of fat used. Less aerateddough is denser than aerated dough resulting in stierdough consistency. It is believed that the solid content ofthe fat at mixing aects dough density, doughs with lowersolid fat have higher densities (Baltsavias et al., 1997).

    Cookie dough containing the non-emulsied hydroge-nated fat (dalda) had an initial consistency of 310 BUand the consistency did not change much even after10 min mixing. The bandwidth of the above farinogramwas 60 BU at 0 min and increased marginally to 80 BUat the end of 10 min mixing. The above observationshowed that the dough was relatively sti and maintainedits consistency even after 10 min mixing in the farinograph.This could be due to the fact that hard fats when used in adough system solidify into undesirable b crystalline formthat do not aid in proper aeration resulting in dense andsti dough (Knightly, 1981). OBrien, Chapman, Neville,Keogh, and Arendt (2003) also reported that hydrogenatedvegetable fats produced very sti biscuit dough. Baltsaviaset al. (1997) explained that a rm fat will be broken downto large lumps, whereas the standard fat will be smearedout over the our particles. Another draw back of thisfat was the absence of an emulsier in its system. An emul-sier is able to trap air and improve the creaming propertyof the dough or batter system (OBrien, 2004). A well aer-ated dough is less sti than a poorly aerated dough. Incor-poration of mono- and di-glycerides reduces thedependence of shortenings upon the crystalline properties,solids-to-liquid ratios, and mixing procedures to developcreaming properties (OBrien, 2004). Presence of emulsi-ers in fat is also highly eective in promoting the uniformdispersion of the fat in dough (Pyler, 1988).

    Cookie dough containing margarine had an initial con-sistency of 380 BU, but the consistency decreased to270 BU with further mixing. The bandwidth of the farino-gram was initially 60 BU and did not alter much with mix-ing further. Subjective observation during dough

    od Engineering 79 (2007) 299305 301preparation in the Hobart mixer showed that the fat, sugarand water formed a very light, uy, well aerated cream

  • is inuenced by factors such as amount of solid materialpresent, size and form of the individual crystals etc. Inordinary plastic shortening the content of solid fats gener-ally comprises 2030%, while the remaining 7080% repre-sent liquid oils (Pyler, 1988). In order for the fat to beeective it should have a correct solids-to-liquid ratio atdough mixing temperature (Given, 1994).

    3.2. Texture analysis of cookie dough

    The force required to compress the cookie dough con-taining four dierent types of fats respectively is shown inFig. 2. Results show that the cookie dough containingthe non-emulsied hydrogenated fat (dalda) was the hard-est requiring more strength to compress it to the required

    Food Engineering 79 (2007) 299305and with the addition of our transformed into a softdough. Therefore, it is possible that even though the initialconsistency of this dough was relatively higher, on furthermixing in the farinograph, the consistency of this doughdecreased signicantly by about 100 BU denoting that thedough became less sti. In most of the cases processingof margarine is directed at achieving a b-crystal modica-tion, which ensures that the fat can readily incorporate andretain air (Hamm & Hamilton, 2004). In addition the mar-garine fat that was used in this study also contained certainemulsiers, which would further have enhanced the aerat-ing properties of the cream. Due to these reasons the coo-kie dough containing margarine broke down easily whenmixed in the Farinograph with a relatively narrow band-width indicating a less elastic dough.

    Finally, the cookie dough containing the emulsied bak-ery fat marvo had an initial consistency of 440 BU, high-est recorded amongst the four fats studied. The consistencyhowever, decreased to 360 BU after 10 min mixing. The ini-tial bandwidth was 80 BU and did not change with mixingthe dough further. During manufacture of bakery fats bhard fats are added to extend their plastic range whichimproves their creaming properties, texture and consis-tency (OBrien, 2004). Even though the initial consistencyof this dough was relatively more compared to the otherthree cookie doughs, the consistency reduced considerablyduring continued mixing in the farinograph, most probablybecause the dough was well aerated hence less dense. Thenarrow bandwidth of the above dough also indicates thenon-elastic nature of the dough. This observation was sim-ilar to the one made for the dough containing margarine.

    It can be argued here that if the initial consistency istaken into consideration, the stiest of the four doughswas the one containing the bakery fat marvo and the soft-est was that containing the oil. However, if their responseto mixing is considered, the dough containing oil showedmore resistance to mixing maintaining its consistencythroughout the mixing period hence the stiest, while thedough containing both margarine and marvo decreasedin its consistency denoting they had the least resistancetowards mixing hence the least sti. The dough containingdalda could also be considered to be sti, as it did notbreak down on continued mixing in the farinograph. Ifthe band width could be related to the tenacious propertiesof the dough, according to Olewnik and Kulp (1984), eventhough the initial band width of the dough containing oilwas less it increased to about 120 BU and maintained itsband width. The least tenacious dough was the one con-taining the margarine.

    The variation in the consistency of the dough containingdierent fats could be due to the variation in their SFIwhich is an indication of the actual proportion of the solidcomponent present in a shortening. Plastic shortenings,although exhibit the properties of solids at room tempera-ture are in reality a mixture of both crystalline and liquid

    302 J. Jacob, K. Leelavathi / Journal oftriglycerides in which the liquid oil is enmeshed in a massof minute fat crystals. The plastic nature of the shorteningextent. Cookie dough containing margarine was the soft-est requiring the least force to compress it. Dough samplescontaining the bakery fat and sunower oil respectivelyhad almost similar textural properties that were marginallyharder than that containing margarine. It is possible thatdough made with oil is generally more cohesive and viscousand hence softer. On the other hand, dough made withhydrogenated fats gives higher values.

    3.3. Physical characteristics of cookies

    The physical characteristics of cookies made using dier-ent fats are shown in Table 2. The result showed that cook-ies containing sunower oil had relatively higher spreadvalue. Abboud et al. (1985) had earlier reported that withthe use of oil there was a non-signicant increase in thediameter of the cookies. Cookies containing margarineand bakery fat (Marvo) respectively had similar spreadvalues. On the other hand, cookie dough containing thehydrogenated fat (dalda) had signicantly less spread. Fin-ney, Yamazaki, and Morris (1950) and later Abboud et al.(1985) concluded that fat type is not an important variablefor cookie spread. But in the above experiment it was notedthat the cookies containing the non-emulsied hydro-genated fat dalda had spread less. The hydrogenated fat

    Fig. 2. Eect of bakery fat (marvo), margarine, non-emulsied hydroge-

    nated fat (dalda), and sunower oil respectively, on cookie doughhardness.

  • tends to form beta crystals which do not support aeration(Knightly, 1981). Partial hydrogenation is applied to helpproduce vegetable bakery shortenings having desirableplastic character (Given, 1994).

    3.4. Measurement of cookie set time

    In the present study it was of interest to observe the set

    fat Marvo spread more gradually. However, the set pointfor both the dough was around 6 min.

    3.5. Measurement of cookie texture

    Measurement of the breaking strength showed that

    Table 2Eect of fat type on the physical characteristics of cookies

    Fat type Width (W) (cm) Thickness (T) (cm) Spread ratio (W/T) Breaking strength (kg f)

    Bakery fat (Marvo) 8.1b 1.08 7.51 4.6a

    Margarine 8.1b 1.10 7.37 4.7a

    Hydrogenated fat (dalda) 7.8c 1.03 7.58 5.1ab

    Sunower oil 8.8a 1.05 8.38 9.7c

    Figures followed by dierent letters are signicantly dierent from each other (p 6 0.05).

    J. Jacob, K. Leelavathi / Journal of Food Engineering 79 (2007) 299305 303time of the cookie dough containing dierent fats. The set-time is the point at which, expansion of the cookie doughstops (Hoseney, Wade, & Finley, 1988). In order to observethe set time of the cookie dough, the sheeted and cut cookiedough (4.5 cm diameter) was placed in the baking ovenmaintained at 205 C. Respective cookie doughs were care-fully removed from the oven at every 1 min interval untilthe nal baking time. The spread of the cookie doughand eventually the cookie was measured at each point ofremoval. The results are shown in Fig. 3. Accordingly, itwas observed that dough containing sunower oil startedto spread earlier than the other doughs and continued tospread for a much longer time until the dough reached itsset point. A high spread rate plus a delayed set time givesthe largest diameter to the cookies (Stauer, 1994). Onthe other hand, dough containing the hydrogenated fatdalda reached its set point much early. Cookie doughcontaining margarine spread faster initially than that con-taining the bakery fat Marvo and reached its set pointaround 5 min of baking. Cookie dough containing bakery

    7

    8

    ead

    (cm)

    bakery fatmargarinehydrogenated fatsunflower oil4

    5

    6

    1 2 3 4 5 6 7 8 9 10Baking time (minutes)

    Cook

    ie s

    pr

    Fig. 3. Eect of bakery fat (marvo), margarine, non-emulsied hydroge-nated fat (dalda), and sunower oil respectively, on the rate of cookiespread.cookies containing the oil were the hardest (Table 2 andFig. 4). On the other hand, breaking strength of cookiescontaining the other three types of fats was not signi-cantly dierent from each other. It was of interest toobserve here that hardness of the dough (Fig. 2) did notnecessarily control the texture of the cookies (Fig. 4). Asobserved earlier cookie dough containing hydrogenatedfat was the hardest and the least dough hardness wasobserved for that containing margarine. The texture ofthe cookie dough containing sunower oil was similar tothat containing the bakery fat. In contrast, cookies madeusing sunower oil were the hardest while those containingthe bakery fat were the least hard. Abboud et al. (1985)also reported that it is not possible to obtain a satisfactorycreamed mass with oil hence lacking proper aeration.Greethead (1969) claim that more plastic and smooth tex-tured the fat greater its shortening power. Softer theworked fat, lower the breaking strength of the cookies.Plasticity in fats is required since during the creaming pro-cess they entrap and retain considerable volumes of airresulting in an important leavening eect. Ordinary liquidoils on the other hand, are dispersed upon mixing throughout the dough in the form of globules that are less eec-tive in their shortening and aerating actions (Hartnett &

    8

    10

    12

    (Kg)0

    2

    4

    6

    Brea

    king

    stre

    ngth

    Bakery fat Margarine Hydrogenated fat Sunflower oil

    Fig. 4. Eect of bakery fat (marvo), margarine, non-emulsied hydroge-nated fat (dalda), and sunower oil respectively, on the breaking strengthof cookies.

  • Thalheimer, 1979). Hornstein, King, and Benedict (1943)claimed that consistency of the worked fat has a highly sig-nicant eect with softer the worked fat, lower the break-ing strength of the cookie. Kamel (1994) explains thatalthough large amounts of air can be incorporated intoliquid oil, it cannot be retained in the system and this mightexplain the hard texture of the cookie.

    3.6. Surface cracking pattern of cookies

    One of the important features of sugar-snap cookies istheir surface cracking pattern. Cookies containing the bak-ery fat had uniform medium sized islands (Fig. 5). Rela-tively smaller islands were seen in cookies containingmargarine. Cookies made using the hydrogenated fatdalda had still smaller islands. On the other hand, cookies

    strength of these cookies reduced signicantly to 5.3 kgfrom 9.7 kg when only oil was used in the formulation(Fig. 6). There was an improvement in the surface islandsalso (Fig. 7). These islands that were large when only oilwas present in the formulation became medium sized andmore acceptable with partial replacement with the bakeryfat. Partial replacement with a plastic fat was sucient toaerate the cookie dough during mixing which imparted asignicant eect on both the texture and surface islandsof the cookies.

    3.8. Eect of sodium steroyl lactylate (SSL) on quality of

    cookies containing oil

    SSL has been demonstrated to contribute to aeration ofthe dough, improve top grain score and also the viscosityof the cookie dough during baking (Tsen, Bauck, &Hoover, 1975). In the present study 0.5% SSL was includedin the cookie formulation containing the oil. The resultswere very signicant. The hardness of the cookies reducedsignicantly (Fig. 6). The hardest of the cookies as was seenearlier were the ones containing the sunower oil recordinga breaking strength of 9.7 kg. When SSL was added thisvalue reduced to 3.5 kg. There was also a signicantimprovement in the surface cracking pattern of the cookies.The islands on the cookie surface were of medium size

    cracking pattern of cookies containing sunower oil (1).

    304 J. Jacob, K. Leelavathi / Journal of Focontaining the oil had large sized islands. Doescher andHoseney (1985) explain that during baking, sucrose presenton the surface of the cookie crystallizes, causing the surfaceto dry rapidly and as the cookie spreads, the dry surfacecracks. In the present study, it can be recalled that the coo-kie doughs containing the three plastic fats respectivelystopped spreading around 5 min of baking while that con-taining the oil continued to spread till about 7 min of bak-ing. It can be reasoned here that sugar crystallization tookplace at the appropriate time that led to drying of the coo-kie surface. But since the cookie dough continued to spreadbecause the dough was not suciently viscous to stop thespread the hardened surface cracked leading to larger sizedislands.

    3.7. Replacement of oil with bakery fat

    Since presence of oil produced cookies which had verylarge surface islands and hard texture it was of interest tosee if partial replacement of oil with the bakery fat wouldhave any improving eect on these cookies. Accordingly50% of oil was replaced with the bakery fat and the cookieswere prepared. The results showed that the breaking

    Fig. 5. Eect of (1) bakery fat (marvo), (2) margarine, (3) non-emulsied

    hydrogenated fat (dalda), and (4) sunower oil on surface cracking patternof cookies.Fig. 6. Eect of sunower oil (SFO), sunower oil + bakery fat (marvo)(SFO + BF), sunower oil + SSL (SFO + SSL), respectively, on cookiebreaking strength.

    Fig. 7. Eect of bakery fat (marvo) (2); and SSL (3); on the surface

    od Engineering 79 (2007) 299305instead of the large ones when no emulsier was used(Fig. 7). There was also a reduction in the spread of the

  • cookies. Incorporation of air cells is known to inuence theviscosity of the system. Viscosity of the cookie dough in the

    Baltsavias, A., Jurgens, A., & van Vliet, T. (1997). Rheological properties

    J. Jacob, K. Leelavathi / Journal of Food Engineering 79 (2007) 299305 305oven is known to aect the spread of the cookies and emul-siers have the ability to control the viscosity of the dough(Tsen et al., 1975). Earlier Hodge (1984) had reported thatexcellent cookies could be made from dough containingrelatively low levels of emulsied liquid oils as comparedto traditional levels of plastic shortenings. Given (1994)has elucidated that even though emulsied oils do notcontain any appreciable solids, they perform as equallywell as plastic shortenings with regard to retention of incor-porated air.

    4. Conclusions

    Measurement of cookie dough consistency in farino-graph showed that the one containing the oil behaved dif-ferently than those containing the other three types of fats.This farinogram looked as though the dough was develop-ing during the initial stages of mixing in the farinograph.And also this dough did not break down during mixingand the farinogram had a relatively stable and wider band.This could be probably because there was more free waterin the dough which had not formed an emulsion with theoil. And this free water was being utilized for the develop-ment of the gluten proteins making the dough more elasticand oering more resistance to mixing. On the other hand,doughs containing the plastic fats showed a tendency forbreak down inferring the relative soft texture of the dough.

    The measurement of texture of the cookie dough in thetexture analyzer revealed that dough containing the hydro-genated fat dalda, needed more force to compress it thanthose containing either the sunower oil or the other twotypes of fats. Here texture of the cookie dough containingoil was similar to the ones containing the bakery fat.

    Comparing the above two measurements with the coo-kie texture, the mixing trend of the cookie dough in the far-inograph seem to give a better insight into the texture ofthe cookies rather than its initial consistency in the farino-graph or the measurement of its compression force in a tex-ture analyzer.

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    Effect of fat-type on cookie dough and cookie qualityIntroductionMaterials and methodsMaterialsMethodsChemical and rheological characteristics of wheat flourRheological characteristic of cookie doughTexture of the cookie doughCookie preparation and evaluationStatistical analysis

    Results and discussionMeasurement of the cookie dough consistencyTexture analysis of cookie doughPhysical characteristics of cookiesMeasurement of cookie set timeMeasurement of cookie textureSurface cracking pattern of cookiesReplacement of oil with bakery fatEffect of sodium steroyl lactylate (SSL) on quality of cookies containing oil

    ConclusionsReferences