Study on the Quality of Market Dahi Compared to Laboratory Made Dahi

  • Shekh, A.L. (Department of Dairy Science, Bangladesh Agricultural University) ;
  • Wadud, A. (Department of Dairy Science, Bangladesh Agricultural University) ;
  • Islam, M.A. (Department of Dairy Science, Bangladesh Agricultural University) ;
  • Rahman, S.M.E. (Division of Food Science and Biotechnology, Kangwon National University) ;
  • Sarkar, M.M. (Bangladesh Livestock Research Institute) ;
  • Ding, Tian (Division of Food Science and Biotechnology, Kangwon National University) ;
  • Choi, Jae-Ho (Division of Food Science and Biotechnology, Kangwon National University) ;
  • Oh, Deog-Hwan (Division of Food Science and Biotechnology, Kangwon National University)
  • Published : 2009.12.31

Abstract

Dahi is yoghurt like fermented dairy products available in Bangladesh made by traditional ways from raw milk. The aim of the present study was to check and compare the present quality status of the market dahi in reference to laboratory made dahi. For this, dahi was prepared in the laboratory (A) and collected from Kishoregonj district (B), Gazipur district (C), Bogra district (D) and Dhaka district (E and F). Consumer acceptance quality was judged on 100 point by a judge panel and chemical and microbiological quality test were done by established methods. 'A' type dahi was superior followed by E, D, F, B and C considering the consumer acceptance quality parameter. From chemical test, it appears that, B possess the lowest pH ($3.75\;{\pm}\;0.05$) and highest was in C ($4.46\;{\pm}\;0.15$). Total solids content of F type dahi ($318.40\;{\pm}\;4.44\;g/kg$) was highest and fat ($52.00\;{\pm}\;2.00\;g/kg$), protein ($44.33\;{\pm}\;2.00\;g/kg$) and ash ($10.76\;{\pm}\;0.31\;g/kg$) content were also higher in F type dahi. E and A type dahi were also with considerable figure in chemical quality parameter. Dahi B was inferior in respect of microbiological quality- total viable count (TVC) (${\times}\;10^5\;cfu/ml$) content was $94.00\;{\pm}\;4.58$, yeast (cfu/ml) content was $183.33\;{\pm}\;15.28$ and mold (cfu/ml) content was $53.33\;{\pm}\;15.28$. The TVC (${\times}\;10^5\;cfu/ml$), yeast (cfu/ml) and mold (cfu/ml) content of A type dahi were $39.67\;{\pm}\;4.51$, $50.00\;{\pm}\;10.00$ and $20.00\;{\pm}\;10.00$, respectively. Considering all the three major quality aspects dahi A was superior than others followed by F, D, E, C and B.

다히(dahi)는 원유를 이용하여 방글라데시 전통 방법으로 발효시킨 요구르트와 비슷한 발효 유제품으로 본 연구는 실험실에서 만든 다히(dahi)와 시장에서 판매되고 있는 다히(dahi)의 품질을 비교하기 위하여 수행되었다. 실험실에서 준비한 다히(dahi)는 (A), Kishoregonj 지역에서 수집한 다히(dahi)는 (B), Gazipur 지역의 다히(dahi)는 (C), Bogra 지역의 다히(dahi)는 (D), Dhaka 지역의 다히(dahi)는 (E, F)로 각각 구분하였다. 소비자 만족 품질은 심사위원들에 의해 100점 만점으로 판단되었으며 화학적 미생물학적 품질 시험은 확립된 방법에 의해 수행되었다. 'A' 타입의 다히(dahi)가 소비자 만족 품질에 있어서 가장 우수한 것으로 나타났으며 그 다음으로 E, D, F, B, C 순으로 나타났다. 화학적 시험 결과, 'B'타입의 다히(dahi)가 가장 낮은 pH ($3.75\;{\pm}\;0.05$)를 나타냈으며 'C'타입의 다히(dahi)가 가장 높은 pH ($4.46\;{\pm}\;0.15$)를 나타내었다. 'F' 타입의 다히(dahi)의 총 고형물, 지방, 단백질, 회분이 각 각 $318.40\;{\pm}\;4.44\;g/kg$, $52.00\;{\pm}\;2.00\;g/kg$, $44.33\;{\pm}\;2.00\;g/kg$, $10.76\;{\pm}\;0.31\;g/kg$으로 가장 높게 나타났다. 'B'타입의 다히(dahi)에서 total viable count (TVC)는 $94.00\;{\pm}\;4.58\;cfu/ml$, 효모가 $183.33\;{\pm}\;15.28\;cfu/ml$, 곰팡이가 $53.33\;{\pm}\;15.28\;cfu/ml$로 미생물학적 품질 측면에서 가장 좋지 않은 것으로 나타났다. 'A' 타입의 다히(dahi)는 TVC, 효모와 곰팡이가 각 각 $39.67\;{\pm}\;4.51\;cfu/ml$, $50.00\;{\pm}\;10.00\;cfu/ml$, $20.00\;{\pm}\;10.00\;cfu/ml$로 나타났다. 3가지 주요 품질을 고려하였을 때 'A'타입의 다히(dahi)가 가장 우수하였으며 그 다음으로 F, D, E, C, B 순으로 나타났다.

Keywords

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