Assessing the Level of Adulteration in Firik Bulgur Mixed with Regular Bulgur by Using a Color Meter: A Preliminary Study

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  • Muharrem Keskin Hatay Mustafa Kemal University



Bulgur, food fraud, color meter, correlation, regression


Firik bulgur is produced by a different method than regular bulgur and is more nutritious but it is three to four times more expensive than normal bulgur. Adulteration is common by mixing normal bulgur to firik bulgur. It is impossible to determine the adulteration level by human eye. In this work, the possibility of detecting the ratio of regular bulgur in the adulterated (mixed) firik bulgur was studied. Two different data sets (DS1 and DS2) were prepared with two different brands of firik bulgur mixed with normal bulgur (mix ratio: from 0 to 100% with increments of 2.5%). Colors of the mixture samples were quantified by using a color meter by two color models (L*a*b* and L*C*h). Correlation and regression analyses were applied. Half of the data (n=41) was used for calibration and the other half (n=41) for validation in the regression analysis. It was found that the normal bulgur ratio in the mixture could be estimated from color data. A slightly better prediction performance was obtained in the DS2 data set (RMSEP=12%; R2=0.83) compared to the DS1 data set (RMSEP=19%; R2=0.57). In sum, a chromameter offers promising results to estimate the ratio of regular bulgur in the adulterated firik bulgur with reasonable accuracy (R2=0.83).


Acer, Z. (2004). The effect of microwave cooking methods and drying temperature on the quality of bulgur. Master’s Thesis. Ondokuz Mayis University. Samsun, Türkiye. 49 pp. (Accessed: 25.07.2023)

Aksehir Grup. (2014). Bulgur Production Processes (In Turkish). (Accessed: 25.07.2023)

Aslam, R., Sharma, S.R., Kaur, J., Panayampadan, A.S., & Dar, O.I. (2023). A systematic account of food adulteration and recent trends in the non‑destructive analysis of food fraud detection. Journal of Food Measurement and Characterization, 17: 3094–3114,

Balci, F. & Bayram, M. (2020). Bulgur cooking process: Recovery of energy and wastewater. Journal of Food Engineering, 269, 109734.

Bannor, R.K., Arthur, K.K., Oppong, D., & Oppong-Kyeremeh, H. (2023). A comprehensive systematic review and bibliometric analysis of food fraud from a global perspective. Journal of Agriculture and Food Research, 14, 100686.

Baumgartner, B., Özkaya, B., Saka, I., & Ozkaya, H. (2023). Functional and physicochemical properties of milled and microfluidized bulgur and chickpea brans. Journal of Agricultural Sciences (Tarim Bilimleri Dergisi), 29(1):200-208.

Bautista, R. (2023). Nowadays the food adulteration: Its consequences and ways to prevent it. Mini Review. J Food Nutr Health. 6(2):143

Bayram, M. (2013). The nutritional value structural features and benefits of bulgur. Miller Journal. 78-82. (Accessed: 29.07.2023)

Caba, Z.T., Boyacioglu, M.H., & Boyacioglu, D. (2012). Bioactive healthy components of bulgur. International Journal of Food Sciences and Nutrition, 63:2, 250-256,

Can, Z., Cimen, M., Aslan, S., & Ozturk, B. (2014). Determination of conformity of rice and bulgur produced in Mardin province to Turkish standards. (In Turkish.) Istanbul Aydin Üniversitesi Dergisi 6(23), 7-11. (Accessed: 28.05.2022)

Carsanba, E., Akca, I., & Timur, M. (2017). Examination of firik produced in Hatay region in terms of nutritional aspect. Gida. 42 (6): 726-730 doi: 10.15237/gida.GD17064 (Accessed: 28.05.2022)

Cetinkaya, A., & G. Gulbaz. (2022). Physicochemical and microbiological properties of Kavılca bulgur (A traditional cereal product of Turkey). Emirates Journal of Food and Agriculture. 34(11): 931-937. https://doi:10.9755/ejfa.2022.v34.i11.2971

Dorra, S.T., Farah, D., Nesrine, H., Wafa, A., & Youkabed, Z. (2022). Drying behavior of bulgur and its effect on phytochemical Content. Foods. 2022, 11, 1062.

Donmez, E., Salantur, A., Yazar, S., Akar, T., & Yildirim, Y. (2004). Situation of bulgur in Turkey and cultivar development for bulgur. Tarla Bitkileri Merkez Arastirma Enstitüsü. Ankara. (Accessed: 25.05.2022)

EnSonHaber. (2020). Turkiye's bulgur production and export leader: Gaziantep (Türkiye’nin bulgur üretimi ve ihracat lideri Gaziantep) (In Turkish). (Accessed: 26.07.2023)

Esbensen, K. H. (2009). Multivariate data analysis – In practice (5th ed.). Camo Software AS.

FAOSTAT, (2021). Wheat production statistics according to countries - Year 2021. The Food and Agriculture Organization (FAO) of the United Nations. (Accessed: 31.08.2023)

Goksu, A., Omac, B., Sabanci, S. (2022). Ohmic heating: A futuristic method for cooking bulgur. Journal of Food Process and Preservation, 46: e17025,

GTB. (2017). Antep firik bulgur (Antep firigi). Commodity Exchange Office of the Gaziantep province (Gaziantep Ticaret Borsasi, GTB) (in Turkish) (Accessed: 28.05.2022)

Giambanelli, E., Ferioli, F., & D’Antuono, L.F. (2020). The fate of bioactive compounds during traditional preparation of einkorn wheat (Triticum monococcum L. subsp. monococcum) bulgur. Journal of Cereal Science, 91, 102890.

Kadioglu, C. (2018). Detection of the presence of ochratoxin A (Ota) in freekeh wheat. Master’s Thesis. Hatay Mustafa Kemal University. Antakya, Hatay. 45pp. (Accessed:26.07.2023)

Keskin, M., Karanlik, S., Gorucu Keskin, S., & Soysal, Y. (2013). Utilization of color parameters to estimate moisture content and nutrient levels of peanut leaves. Turkish Journal of Agriculture and Forestry, 37, 604–612.

Keskin, M., Setlek, P., & Demir, S. (2017). Use of color measurement systems in food science and agriculture. International Advanced Researches & Engineering Congress. 16-18 November 2017. Osmaniye, Turkey. pp.2350-2359.

Keskin, M., Arslan, A., Soysal, Y., Sekerli, Y.E., & Celiktas, N. (2021). Feasibility of a chromameter and chemometric techniques to discriminate pure and mixed organic and conventional red pepper powders: A pilot study. Journal of Food Processing and Preservation, e15846.

Keskin, M., Soysal, Y., Celiktas, N., & Sekerli, Y.E. (2022). Applied microwave power estimation of black carrot powders using spectroscopy combined with chemometrics. Spectroscopy Letters, DOI:

Kiani, S., Minaei, S., & Ghasemi-Varnamkhasti, M. (2017). Integration of computer vision and electronic nose as non-destructive systems for saffron adulteration detection. Computers and Electronics in Agriculture, 141, 46-53.

Koksal, H., & Cetiner, B. (2015). Future of grain science series: grain science and industry in Turkey: past, present, and future. Cereal Foods World, 60, 90–96.

Momtaz, M., Bubli, S.Y., Khan, M.S. (2023) Mechanisms and health aspects of food adulteration: A comprehensive review. Foods, 12, 199.

Oguz, H., Nizamoglu, F., Dinc, I., Uney, K., & Aydin, H. (2011). Determination of aflatoxin existence in mixed feed, wheat flour and bulgur samples. Eurasian Journal Veterinary Science, 27(3): 171-175. (Accessed:25.05.2022)

Ozbas, O.O., & Koksel, H. (2003). Comparison of physical, chemical and cooking properties of triticale and wheat bulgur (In Turkish with Abstract in English). Gida, 28: 531-537 (Accessed: 26.07.2023)

Pekkirisci, B. (2022). Determination of the physical, chemical and antinutritional properties of firik and siyez bulgur sold in Turkey markets. Master's Thesis. 94pp. Konya Necmettin Erbakan University, Türkiye.

Rafinera (2022). Benefits of bulgur (In Turkish). (Accessed: 25.07.2023)

Rasheed, A., Parveen, S., Afzaal, M., Niaz, B., Saeed, F., Hussain, M., Yasmina, A., Qamar, A., Ateeq, H., Raza, M.A., & Al Jbawi, E. (2023). Exploring biochemical profile, antioxidant activity and structural properties of Bulgur prepared from traditional and autoclave methods. International Journal of Food Properties, 26(1):274–289,

Sannino, A. & Savini, S. (2021). A fast and simple method for the determination of 12 synthetic dyes in spicy foods by UHPLC-HRMS. ACS Food Science and Technology. 1, 107−112.

Savas, K. (2010). Utilization of infrared treatment in bulgur production and its effect on bulgur quality. Master’s Thesis. 93 pp. Hacettepe University, Ankara, Türkiye. (Accessed: 26.07.2023)

Shah, Y.A., Saeed, F., Afzaal, M., Ahmad, A., Hussain, M., Ateeq, H., & Khan, M.H. (2022). Biochemical and nutritional properties of wheat bulgur: A review. Journal of Food Process and Preservation, 46: e16861,

Sezer, B., Apaydin, H., Bilge, G., & Boyaci, I. H. (2018). Coffee arabica adulteration: Detection of wheat, corn and chickpea. Food Chemistry, 264, 142-148.

Sezer, B., Apaydin, H., Bilge, G., & Boyaci, I. H. (2019). Detection of Pistacia vera adulteration by using laser induced breakdown spectroscopy. Journal of the Science of Food and Agriculture, 99(5), 2236-2242.

Singh, S., Sharma, N.S, Dar, B.N., & Sharma, S. (2013). Quality of bulgur wheat in relation to storage. American Journal of Food Technology. doi: 10.3923/ajft.2014.63.68

Sneha, S., Surjith, S., Raj A. (2023) A review on food adulteration detection techniques: Methodologies, applications, and challenges. 2023 IEEE International Conference on Control, Communication and Computing (ICCC) 19-21 May 2023.

Snyder, C. (2023). What is bulgur wheat? Everything you need to know. (Accessed: 29.07.2023)

Tayfur, M., Yucecan, S., & Mutluer, B. (1992). Occurrence of aflatoxins and ochratoxin in Turkish special wheat product (Bulgur). Beslenme ve Diyet Dergisi, 21: 85-94 (Accessed: 26.05.2022)

Tekin, M., Babacan, U., Batu, O., Akar, T., Cengiz, M.F. (2022). The effects of genotypic variation in hulled wheat species and cooking methods on some quality parameters of bulgur. Journal of Food Processing and Preservation. 46: e15979.

WFP, 2021. Technical specifications for bulgur wheat. Version V1. 5pp. (Accessed:26.07.2023)

Yilmaz, M.S. & Yildirim, A. (2020). Production techniques and functional properties of firik. Harran University Journal of Engineering. 5(2): 109-121. (Accessed:26.07.2023)

Yousif, S.I., Bayram, M. & Kesen, S. (2018). Characterization of volatile compounds of bulgur (Antep type) produced from durum wheat. Hindawi Journal of Food Quality, Vol.2018, Article ID 8564086,