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Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt

Yıl 2019, Cilt: 23 Sayı: 1, 46 - 51, 01.04.2019
https://doi.org/10.19113/sdufenbed.442395

Öz

In this survey, it was aimed
to determine the concentration of aflatoxin M1 (AFM1) in
milk during the production and storage of salted (tuzlu) yogurt using
High
Performance Liquid Chromatography (
HPLC).
Salted (tuzlu) yogurt was produced artificially from contaminated milk with AFM1
at two different levels (0.05 µg/l and 0.1 µg/l). Y
ogurt and strained yogurt
production caused losses of AFM1 about 65%, 70.25% and 73.75%,
81.12% respectively, in milk contaminated with 0.05
µg/l AFM1, and 0.1 µg/l AFM1. Also, it was determined that the storage process of
the salted (tuzlu) yogurt (90 days) decreases the AFM1 content of
the salted (tuzlu) yogurt by 0.019 and 0.027
µg/l (0.05 µg/l and 0.1 µg/l AFM1
respectively).
Difference among dates in storage period was found
to be statistically significant (P<0.01). S
alted (tuzlu) yogurt
has long shelf life and high heat processing, and AFM1 is not
completely lost in both levels.

Kaynakça

  • [1] Abdolgader, R.E., Mohamed, S.E., Agoub, A.A., Bosallum, S.T., Hasan, S.M. 2017. A study the occurance of aflatoxin M1 in raw and sterilized milk in Eljabal Alakder region of Libya. International Journal of Science and Research Methodology, Human, 5(3), 1-8.
  • [2] Ortiz, M.V., Moreno, M.C., Camarillo, E.H., Velasco, S.R., Callejas, F.R. 2017. Unreported aflatoxins and hydroxylate metabolites in artisanal Oaxaca cheese from Veracruz, Mexico. Biochem Anal Biochem, 6(2), 322.
  • [3] Prandini, A., Tansini, G., Sigolo, S., Filippi, L., Laporta, M., Piva, G. 2009. On the occurrence of aflatoxin M1 in milk and dairy products. Food and Chemical Toxicology, 47, 984-991.
  • [4] Wang, H., Zhou, X.J., Liu, Y.Q., Yang, H.M., Guo, Q.L. 2010. Determination of aflatoxin M1 in milk by triple quadrupole liquid chromatography-tandem mass spectrometry. Food Additives and Contaminants-Part A, 27, 1261–1265.
  • [5] Hussein, H.S., Brasel, J.M. 2001. Toxicity, metabolism and impact of mycotoxins on humans and animals. Toxicology, 167, 101–134.
  • [6] Kocasarı, F.S., Tascı, F., Mor, F. 2012. Survey of aflatoxin M1 in milk and dairy products consumed in Burdur, Turkey. International Journal of Dairy Technology, 65, 365-371.
  • [7] Marin, V.R., Moreno, M.C., Villasenor M.C.G., Hernandez, E.A.G., Mendoza, A.G. 2018. Presence of aflatoxin carcinogens in fresh and mature cheeses. Pharm Anal Acta, 9(3), 581.
  • [8] Camarillo, E.H., Moreno, M.C., Olvera, V.J.R., Ortiz, M.V., Cervantes, M.A.S., Roudot, A.C., Jimenes, G.C.R. 2016. Quantifying the levels of the mutagenic, carcinogenic hydroxylated aflatoxins (AFM1 and AFM2) in artisanal Oaxaca-Type cheeses from the City of Veracruz, Mexico. J Microb Biochem Technol, 8 (6), 491-497.
  • [9] Yoon, B.R., Hong, S.Y., Cho, S.M., Lee, K.R., Kim, M., Chung, S.H. 2016. Aflatoxin M1 levels in dairy products from South Korea determined by high performance liquid chromatography with fluorescens detection. Journal of Food and Nutrition Research, 55(2), 171-180.
  • [10] Ketney, O., Santini, A., Oancea, S. 2017. Recent aflatoxin survey data in milk and milk product: A review. International Journal of Dairy Technology, 70, 1-12.
  • [11] JECFA, 2001. Aflatoxin M, In ‘Safety evaluation of specific mycotoxins’ prepared by the fifty-sixth meeting of the Joint FAO/WHO Expert Committee on Food Additives (JECFA), 6–15 February, Geneva.
  • [12] Alkan, Y., Gonulalan, Z. 2006. An investigation on aflatoxin M1 levels, moisture content and acidity values in white cheeses retailed in Amasya province. Journal of Health Science, 15(2), 91-98.
  • [13] Baskaya, R., Aydin, A., Yıldız, A., Bostan, K. 2006. Aflatoxin M1 levels of some cheese varieties in Turkey. Medycyna Wet., 62(7), 778-780.
  • [14] Beasley, V.R. 2011. Pathophysiology and clinical manifestations of mycotoxin andphycotoxin poisonings. Egyptian Journal of Natural Toxins, 8, 104-133.
  • [15] FDA, 1996. CPG Sec. 527.400 Whole milk, low fat milk, skim milk-aflatoxin M1 (CPG 7106.210). In FDA Compliance Policy Guides, FDA, Washington.
  • [16] EC, 2006. Commission Regulation No 1881 ⁄ 2006 of 19 December 2006. Setting maximum levels for certain contaminants in foodstuffs. Official Jounal of The European Communinities, 36(4), 5–24.
  • [17] TFC, 2008. Republic of Turkey Ministry of Food, Agriculture and Livestock, Turkish Food Codex Regulation on Contaminants. Official Gazette, 29.12.2011/28157(3. iterated), Ankara, Turkey.
  • [18] Cotty, P.J., Garcia, R.J. 2007. Influences of climate on aflatoxin producing fungi and aflatoxin contamination. International Journal of Food Microbiology, 119, 109-115.
  • [19] Aygun, O., Essiz, D., Durmaz, H., Yarsan, E., Altintas, L. 2009. Aflatoxin M1 levels in Surk samples, a traditional Turkish cheese from Southern Turkey. Bull Environ Contam Toxicol, 83, 164-167.
  • [20] Guler, Z. 2007a. Minerals in local goat milk, its strained yogurt and salted yogurt (tuzlu yoğurt). Small Ruminant Research, 71, 130-137.
  • [21] Guler, Z. Park, Y.W., 2009. Evaluation of chemical and color index characteristics of goat milk, its yogurt and salted yogurt. Tropical and Subtropical Agroecosystems, 11, 37-39.
  • [22] Evrendilek, G.A. 2007. Survival of Escherichia coli O157:H7 in yogurt drink, plain yogurt and salted (tuzlu) yogurt: effects of storage time, temperature, background flora and product characteristics. International Journal of Dairy Technology, 60(2), 118-122.
  • [23] Guler, Z. 2007b. Changes in salted yogurt during storage. International Journal of Food Science and Technology, 42, 235-245.
  • [24] TFC, 2009. Republic of Turkey Ministry of Food, Agriculture and Livestock, Turkish Food Codex, Communique on Fermented Milk Products. Official Gazette, 16.02.2009/27143, Ankara, Turkey.
  • [25] Govaris, A., Roussi, V., Koidis, P.A., Botsoglou, N.A. 2002. Distribution and stability of aflatoxin M1 during production and storage of yogurt. Food Additives and Contaminants, 19(11), 1043-1050.
  • [26] Anonymous, 1999. Rhone Diagnostics Technologies IAC-HPLC. AB Komisyonu Merkez Araştırma Birimi. Ispra, Italy.
  • [27] Gurbay, A., Aydin, S., Girgin, G., Engin, A.B., Sahin, G. 2006. Assessment of aflatoxin M1 levels in milk in Ankara, Turkey. Food Control, 17, 1-4.
  • [28] Martins, M.L., Martins, H.M. 2004. Aflatoxin M1 in yogurt in Portugal. International Journal of Food Microbiology, 91, 315-317.
  • [29] Deveci, O. 2007. Changes in the concentration of aflatoxin M1 during manufacture and storage of White Pickled cheese. Food Control, 18(1), 103–1107.
  • [30] Choudhary, P.L., Sharma, R.S., Borkartria, V.N. 1998. Effect of chilling and heating on aflatoxin M1 content of contaminated Indian cow's milk. Egyptian Journal of Dairy Science, 26, 223-229.
  • [31] Bilandzic, N., Tankovic, S., Jelusic, V., Varenina, I., Kolavonic, B.S., Luburic, D.B., Cvetnic, Z. 2016. Aflatoxin M1 in raw and UHT cow milk collected Bosnia and Herzegovina Croatia. Food Control, 68, 352-357.
  • [32] Li, S., Min, L., Wang, P., Zhang, Y., Zheng, N., Wang, J. 2017. Occurrence of aflatoxin M1 in pasteurized and UHT milks in China in 2014-2015. Food Control, 78, 94-99.
  • [33] Nadira, A.F., Rosita, J., Norhaizan, M.E., Redzwan, S.M. 2017. Screening of aflatoxin M1 occurrence in selected milk and dairy products in Terengganu, Malaysia. Food Control, 73, 209-214.
  • [34] Iqbal, S.Z., Asi, M.R. 2013. Assessment of aflatoxin M1 in milk and milk products from Punjab, Pakistan. Food Control, 30, 235-239.
  • [35] Bahrami, Z., Shahbazi, Y., Nikousefat, Z. 2016. Aflatoxin M1 in milk and traditional dairy products from west part of Iran: occurrence and seasonal variation with an emphasis on risk assessment of human exposure. Food Control, 62, 250-256.
  • [36] Maryamma, K.L., Rajan, A., Gangadharan, B., Ismail, P.K., Valsala, K.V., Manomohan, C.B. 1990. Reduction of afatoxin in milk by fermentation into curd. Journal of Veterinary Animal Science, 21, 102-107.
  • [37] Hassanin, N.I. 1994. Stability of aflatoxin M1 during manufacture and storage of yogurt, yogurt-cheese and acidifed milk. Journal of the Science of Food and Agriculture, 65, 31-34.
  • [38] Iha, M.H., Barbosa, C.B., Okada, I.A., Trucksess, M.W. 2013. Aflatoxin M1 in milk and distribution and stability of aflatoxin M1 during production and storage of yoghurt and cheese. Food Control, 29, 1-6.
  • [39] Elsanhoty, R.M., Salam, S.A., Ramadan, M.F., Badi, F.H. 2014. Detoxification of aflatoxin M1 in yogurt using probiotics and lactic acid bacteria. Food Control, 43, 129-134.
  • [40] Motawee, M.M. 2013. Reduction of aflatoxin M1 content during manufacture and storage of egyptian domaiti cheese. International Journal of Veterinary Medicine: Research & Reports. Vol. 2013, Article ID 207299.

Tuzlu Yoğurdun Üretimi ve Uzun Süre Depolanması Sırasında Aflatoksin M1 Konsantrasyonundaki Değişiklikler

Yıl 2019, Cilt: 23 Sayı: 1, 46 - 51, 01.04.2019
https://doi.org/10.19113/sdufenbed.442395

Öz










Bu
çalışmada, yüksek performanslı sıvı kromatografisi (HPLC) kullanılarak tuzlu
yoğurdun üretimi ve depolanması sırasında sütteki aflatoksin M1 (AFM1)
konsantrasyonunun belirlenmesi amaçlanmıştır. Y
apay yolla iki farklı düzeyde (0.05 μg/l ve 0.1
μg/l) aflatoksin M1 (AFM1) ile kontamine edilmiş
sütlerden tuzlu yoğurt üretilmiştir.
0.05 µg/l AFM1 ve 0.1 µg/l AFM1
ile kontamine edilmiş sütlerden yoğurt ve süzme yoğurt üretimi sırasıyla % 65,
% 70.25 ve % 73.75, % 81.12 düzeyinde AFM1 kaybına neden olmuştur.
Ayrıca tuzlu
yoğurda uygulanan depolama işleminin (90 gün), tuzlu yoğurdun AFM1
içeriğini sırasıyla
0.019 ve
0.027 µg/l

değerlerine azalttığı tespit edilmiştir (0.05 μg/l ve 0.1 μg/l AFM1).
Depolama
periyodundaki zamanlar arasındaki fark istatistiksel olarak önemli bulunmuştur
(P<0.01). Tuzlu yoğurt uzun raf ömrüne ve yüksek ısıl işleme sahiptir ve AFM1
her iki seviyede de tamamen kaybolmamıştır.
    

Kaynakça

  • [1] Abdolgader, R.E., Mohamed, S.E., Agoub, A.A., Bosallum, S.T., Hasan, S.M. 2017. A study the occurance of aflatoxin M1 in raw and sterilized milk in Eljabal Alakder region of Libya. International Journal of Science and Research Methodology, Human, 5(3), 1-8.
  • [2] Ortiz, M.V., Moreno, M.C., Camarillo, E.H., Velasco, S.R., Callejas, F.R. 2017. Unreported aflatoxins and hydroxylate metabolites in artisanal Oaxaca cheese from Veracruz, Mexico. Biochem Anal Biochem, 6(2), 322.
  • [3] Prandini, A., Tansini, G., Sigolo, S., Filippi, L., Laporta, M., Piva, G. 2009. On the occurrence of aflatoxin M1 in milk and dairy products. Food and Chemical Toxicology, 47, 984-991.
  • [4] Wang, H., Zhou, X.J., Liu, Y.Q., Yang, H.M., Guo, Q.L. 2010. Determination of aflatoxin M1 in milk by triple quadrupole liquid chromatography-tandem mass spectrometry. Food Additives and Contaminants-Part A, 27, 1261–1265.
  • [5] Hussein, H.S., Brasel, J.M. 2001. Toxicity, metabolism and impact of mycotoxins on humans and animals. Toxicology, 167, 101–134.
  • [6] Kocasarı, F.S., Tascı, F., Mor, F. 2012. Survey of aflatoxin M1 in milk and dairy products consumed in Burdur, Turkey. International Journal of Dairy Technology, 65, 365-371.
  • [7] Marin, V.R., Moreno, M.C., Villasenor M.C.G., Hernandez, E.A.G., Mendoza, A.G. 2018. Presence of aflatoxin carcinogens in fresh and mature cheeses. Pharm Anal Acta, 9(3), 581.
  • [8] Camarillo, E.H., Moreno, M.C., Olvera, V.J.R., Ortiz, M.V., Cervantes, M.A.S., Roudot, A.C., Jimenes, G.C.R. 2016. Quantifying the levels of the mutagenic, carcinogenic hydroxylated aflatoxins (AFM1 and AFM2) in artisanal Oaxaca-Type cheeses from the City of Veracruz, Mexico. J Microb Biochem Technol, 8 (6), 491-497.
  • [9] Yoon, B.R., Hong, S.Y., Cho, S.M., Lee, K.R., Kim, M., Chung, S.H. 2016. Aflatoxin M1 levels in dairy products from South Korea determined by high performance liquid chromatography with fluorescens detection. Journal of Food and Nutrition Research, 55(2), 171-180.
  • [10] Ketney, O., Santini, A., Oancea, S. 2017. Recent aflatoxin survey data in milk and milk product: A review. International Journal of Dairy Technology, 70, 1-12.
  • [11] JECFA, 2001. Aflatoxin M, In ‘Safety evaluation of specific mycotoxins’ prepared by the fifty-sixth meeting of the Joint FAO/WHO Expert Committee on Food Additives (JECFA), 6–15 February, Geneva.
  • [12] Alkan, Y., Gonulalan, Z. 2006. An investigation on aflatoxin M1 levels, moisture content and acidity values in white cheeses retailed in Amasya province. Journal of Health Science, 15(2), 91-98.
  • [13] Baskaya, R., Aydin, A., Yıldız, A., Bostan, K. 2006. Aflatoxin M1 levels of some cheese varieties in Turkey. Medycyna Wet., 62(7), 778-780.
  • [14] Beasley, V.R. 2011. Pathophysiology and clinical manifestations of mycotoxin andphycotoxin poisonings. Egyptian Journal of Natural Toxins, 8, 104-133.
  • [15] FDA, 1996. CPG Sec. 527.400 Whole milk, low fat milk, skim milk-aflatoxin M1 (CPG 7106.210). In FDA Compliance Policy Guides, FDA, Washington.
  • [16] EC, 2006. Commission Regulation No 1881 ⁄ 2006 of 19 December 2006. Setting maximum levels for certain contaminants in foodstuffs. Official Jounal of The European Communinities, 36(4), 5–24.
  • [17] TFC, 2008. Republic of Turkey Ministry of Food, Agriculture and Livestock, Turkish Food Codex Regulation on Contaminants. Official Gazette, 29.12.2011/28157(3. iterated), Ankara, Turkey.
  • [18] Cotty, P.J., Garcia, R.J. 2007. Influences of climate on aflatoxin producing fungi and aflatoxin contamination. International Journal of Food Microbiology, 119, 109-115.
  • [19] Aygun, O., Essiz, D., Durmaz, H., Yarsan, E., Altintas, L. 2009. Aflatoxin M1 levels in Surk samples, a traditional Turkish cheese from Southern Turkey. Bull Environ Contam Toxicol, 83, 164-167.
  • [20] Guler, Z. 2007a. Minerals in local goat milk, its strained yogurt and salted yogurt (tuzlu yoğurt). Small Ruminant Research, 71, 130-137.
  • [21] Guler, Z. Park, Y.W., 2009. Evaluation of chemical and color index characteristics of goat milk, its yogurt and salted yogurt. Tropical and Subtropical Agroecosystems, 11, 37-39.
  • [22] Evrendilek, G.A. 2007. Survival of Escherichia coli O157:H7 in yogurt drink, plain yogurt and salted (tuzlu) yogurt: effects of storage time, temperature, background flora and product characteristics. International Journal of Dairy Technology, 60(2), 118-122.
  • [23] Guler, Z. 2007b. Changes in salted yogurt during storage. International Journal of Food Science and Technology, 42, 235-245.
  • [24] TFC, 2009. Republic of Turkey Ministry of Food, Agriculture and Livestock, Turkish Food Codex, Communique on Fermented Milk Products. Official Gazette, 16.02.2009/27143, Ankara, Turkey.
  • [25] Govaris, A., Roussi, V., Koidis, P.A., Botsoglou, N.A. 2002. Distribution and stability of aflatoxin M1 during production and storage of yogurt. Food Additives and Contaminants, 19(11), 1043-1050.
  • [26] Anonymous, 1999. Rhone Diagnostics Technologies IAC-HPLC. AB Komisyonu Merkez Araştırma Birimi. Ispra, Italy.
  • [27] Gurbay, A., Aydin, S., Girgin, G., Engin, A.B., Sahin, G. 2006. Assessment of aflatoxin M1 levels in milk in Ankara, Turkey. Food Control, 17, 1-4.
  • [28] Martins, M.L., Martins, H.M. 2004. Aflatoxin M1 in yogurt in Portugal. International Journal of Food Microbiology, 91, 315-317.
  • [29] Deveci, O. 2007. Changes in the concentration of aflatoxin M1 during manufacture and storage of White Pickled cheese. Food Control, 18(1), 103–1107.
  • [30] Choudhary, P.L., Sharma, R.S., Borkartria, V.N. 1998. Effect of chilling and heating on aflatoxin M1 content of contaminated Indian cow's milk. Egyptian Journal of Dairy Science, 26, 223-229.
  • [31] Bilandzic, N., Tankovic, S., Jelusic, V., Varenina, I., Kolavonic, B.S., Luburic, D.B., Cvetnic, Z. 2016. Aflatoxin M1 in raw and UHT cow milk collected Bosnia and Herzegovina Croatia. Food Control, 68, 352-357.
  • [32] Li, S., Min, L., Wang, P., Zhang, Y., Zheng, N., Wang, J. 2017. Occurrence of aflatoxin M1 in pasteurized and UHT milks in China in 2014-2015. Food Control, 78, 94-99.
  • [33] Nadira, A.F., Rosita, J., Norhaizan, M.E., Redzwan, S.M. 2017. Screening of aflatoxin M1 occurrence in selected milk and dairy products in Terengganu, Malaysia. Food Control, 73, 209-214.
  • [34] Iqbal, S.Z., Asi, M.R. 2013. Assessment of aflatoxin M1 in milk and milk products from Punjab, Pakistan. Food Control, 30, 235-239.
  • [35] Bahrami, Z., Shahbazi, Y., Nikousefat, Z. 2016. Aflatoxin M1 in milk and traditional dairy products from west part of Iran: occurrence and seasonal variation with an emphasis on risk assessment of human exposure. Food Control, 62, 250-256.
  • [36] Maryamma, K.L., Rajan, A., Gangadharan, B., Ismail, P.K., Valsala, K.V., Manomohan, C.B. 1990. Reduction of afatoxin in milk by fermentation into curd. Journal of Veterinary Animal Science, 21, 102-107.
  • [37] Hassanin, N.I. 1994. Stability of aflatoxin M1 during manufacture and storage of yogurt, yogurt-cheese and acidifed milk. Journal of the Science of Food and Agriculture, 65, 31-34.
  • [38] Iha, M.H., Barbosa, C.B., Okada, I.A., Trucksess, M.W. 2013. Aflatoxin M1 in milk and distribution and stability of aflatoxin M1 during production and storage of yoghurt and cheese. Food Control, 29, 1-6.
  • [39] Elsanhoty, R.M., Salam, S.A., Ramadan, M.F., Badi, F.H. 2014. Detoxification of aflatoxin M1 in yogurt using probiotics and lactic acid bacteria. Food Control, 43, 129-134.
  • [40] Motawee, M.M. 2013. Reduction of aflatoxin M1 content during manufacture and storage of egyptian domaiti cheese. International Journal of Veterinary Medicine: Research & Reports. Vol. 2013, Article ID 207299.
Toplam 40 adet kaynakça vardır.

Ayrıntılar

Birincil Dil İngilizce
Konular Mühendislik
Bölüm Makaleler
Yazarlar

Zehra Albay 0000-0002-5090-8151

Bedia Şimşek 0000-0002-7497-1542

Yayımlanma Tarihi 1 Nisan 2019
Yayımlandığı Sayı Yıl 2019 Cilt: 23 Sayı: 1

Kaynak Göster

APA Albay, Z., & Şimşek, B. (2019). Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt. Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 23(1), 46-51. https://doi.org/10.19113/sdufenbed.442395
AMA Albay Z, Şimşek B. Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt. SDÜ Fen Bil Enst Der. Nisan 2019;23(1):46-51. doi:10.19113/sdufenbed.442395
Chicago Albay, Zehra, ve Bedia Şimşek. “Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt”. Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi 23, sy. 1 (Nisan 2019): 46-51. https://doi.org/10.19113/sdufenbed.442395.
EndNote Albay Z, Şimşek B (01 Nisan 2019) Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt. Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi 23 1 46–51.
IEEE Z. Albay ve B. Şimşek, “Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt”, SDÜ Fen Bil Enst Der, c. 23, sy. 1, ss. 46–51, 2019, doi: 10.19113/sdufenbed.442395.
ISNAD Albay, Zehra - Şimşek, Bedia. “Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt”. Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi 23/1 (Nisan 2019), 46-51. https://doi.org/10.19113/sdufenbed.442395.
JAMA Albay Z, Şimşek B. Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt. SDÜ Fen Bil Enst Der. 2019;23:46–51.
MLA Albay, Zehra ve Bedia Şimşek. “Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt”. Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, c. 23, sy. 1, 2019, ss. 46-51, doi:10.19113/sdufenbed.442395.
Vancouver Albay Z, Şimşek B. Assessment of Aflatoxin M1 Concentrations During Production and Long Storage of Salted (Tuzlu) Yogurt. SDÜ Fen Bil Enst Der. 2019;23(1):46-51.

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