Evaluation of sensory properties and their correlation coefficients with physico-chemical indices in Turkish set-type yoghurts

Zehra Güler, Young W. Park

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DOI: 10.4236/ojas.2011.11002                

Abstract

Sensory properties and physico-chemical parameters of 10 most popular brands of commercial set-type Turkish yoghurts were evaluated and correlation coefficients between the two indices were investigated. The results indicated that increases in volatile compounds (acetaldehyde, 2-butanone, 2-nanonane, ethyl acetate), titratable acidity, ash and fat contents inversely correlated with the overall acceptability score of the yoghurt. However, diacetyl, C4 to C12 free fatty acids, pH, whiteness index and texture positively correlated with overall acceptability of the yoghurt products. It was concluded that the acceptability of the Turkish set-type yoghurts is mainly governed by the fifteen volatile compounds as well as the physico-chemical properties determined. Thus, the overall acceptability of the yoghurts was not influenced by a single characteristic, but rather by complex in nature.

Keywords

Turkish set-type yoghurt, sensory properties, physico-chemical parameters, correlation coefficient

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Badings H T, Van der Pol JG and Neeter R (1981) Aroma compounds which contribute to the difference in flavor between pasteurized milk and UHT milk. In Flavor ‘81’, pp 685-692, Schreier P, ed. Berlin: Walter de Gruyter.
[2]	Barnes DL, Harper SJ, Bodyfelt FW and McDaniel MR (1991) Prediction of consumer acceptability of yogurt by sensory and analytical measures of sweetness and sourness. Journal Dairy Science 74 3746-54.
[3]	Beshkova D, Simova E, Frengova G and Simov Z (1998). Production of flavour compounds by yogurt starter cultures. J. Industrial Microbiology & Biotechnology, 20, 180-186
[4]	Bodyfelt FW, Tobias J, Trout GM (1988) The sensory evaluation of dairy products. Pp.598. New York, USA: Van Nostrand Reinhold.
[5]	Chammas G, Saliba R and Beal C (2006) Charac- terization of the Fermented Milk “Laban” with Sensory Analysis and Instrumental Measurements Journal of Food Science 71 156-162.
[6]	FAO (2006) Food Agricultural Organization. www.faostat.fao.org
[7]	Harper SJ, Barnes DL, Bodyfelt FW and McDaniel MR (1991) Sensory ratings of commercial plain yogurts by consumer and descriptive panels. Journal Dairy Science 74 2927-35.
[8]	Kneifel W, Ulbert F, Erhard F and Jaros D (1992) Aroma profiles and sensory properties of yoghurt and yoghurt related products. I. Screening of commercially available starter cultures. Milchwissenchaft 47 362-365.
[9]	Lindsay R C, Day E A and Sandine W E (1965) Green flavor defect in lactic starter cultures. Journal Dairy Science 48 863.
[10]	Macciola V, Candela G and De Leonardis A (2008) Rapid gas-chromatographic method for the determination of diacetyl in milk, fermented milk and butter. Food Control 19 873-878.
[11]	Modler HW, Larmond ME, Lin CS, Froehlich D, and Emmons DB (1983) Physical and
[12]	sensory properties of yogurt stabilized with milk proteins. Journal Dairy Science 66 422-9.
[13]	Molimard P and Spinnler HE (1996) Compound Involved in the Flavor of Surface Mold-Ripened Cheeses: Origins and Properties. Journal of Dairy Science 79 169-184.
[14]	Ott A, Germond JE and Chaintreau A (2000) Vicinal diketone dormation in yoghurt: 13C precursors and effect of branched-chain amino acids. Journal of Agricultural and Food Chemistry 48 724-731.
[15]	Pohjanheimo T and Sandell M (2009) Explaining the liking for drinking yoghurt: The role of sensory quality, food choice motives, health concern and product information. International Dairy Journal 19 459-466.
[16]	Rychlik M, Sax M and Schieberle P (2006) On the role of short-chain free fatty acids for the development of a cheese-like off-note in pasteurized yoghurt. LWT 39 521-527.
[17]	Rysstad G and Abrahamsen RK (1987) Formation of volatile aroma compounds and carbon dioxide in yogurt starter grown in cows’ and goats’ milk Journal of Dairy Research 54 257-266.
[18]	Sable S and Cottenceau G (1999) Current Knowladge of Soft Cheeses Flavor and Related Compounds. Journal Agricural Food Chemistry 47 4825-4836.
[19]	Serra M, Trujillo AJ, Guamis B and Ferragut V (2009) Flavour profiles and survival of starter cultures of yoghurt produced from high-pressure homogenized milk. International Dairy Journal 19 100-106.
[20]	Skriver A, Holstborg J and Qvist KB (1999) Relation between sensory texture analysis
[21]	and rheological properties of stirred yogurt. Journal Dairy Research 66 609-18.
[22]	Sodini I, Remeuf F, Haddad S and Corrieu H (2004) The Relative Effect of Milk Base,
[23]	Starter, and Process on Yogurt Texture: A Review Critical Reviews in Food Science and Nutrition 44 113-137.
[24]	Stelios K, Stamou P and Massouras T (2007) Comparision of The Characterstics of Set Type Yohurt Made From Ovine Milk of Different Fat Content. International Journal Food Science and Technology 42 1019-1028.
[25]	Tamime A Y and Robinson RK (2001) Yoghurt Science and Technology. pp 619, New York US: CRC Pres.
[26]	TSI (2006) Yogurt. TS 1330. Ankara: Turkish Standar Institution.
[27]	Ulbert F and Kneifel W (1992) Aroma profiles and sensory properties of yoghurt and yoghurt-related pro- ducts. II. Classification of starter cultures by means of cluster analysis. Milchwissenchaft 47 432-434.
[28]	Warsy J D (1983) production of volatile aroma com- pounds in Dahi. Journal Agricultural Research 21 (1) 31-36.