بررسی اثر فصل و نوع دامداری بر مقدار آفلاتوکسین M1 و کیفیت شیر خام

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، گروه مواد غذایی، پژوهشکده صنایع غذایی و کشاورزی، پژوهشگاه استاندارد، کرج، ایران

2 کارشناس صنایع غذایی، مدیر کنترل کیفیت کارخانه کیمیا لبن، خرم آباد، ایران

چکیده

کیفیت شیر خام بر کیفیت فرآورده‌های آن تأثیر دارد. هدف این مطالعه بررسی در این بررسی تعداد 600 نمونه شیر خام از 5 دامداری صنعتی و 5 مرکز جمع‌آوری شیر (در طی دو فصل تابستان و زمستان) در شهرستان خرم‌آباد در سال 1396 آباد تهیه شد. مقدار آفلاتوکسین M1 با استفاده از روش کروماتوگرافی مایع با کارآیی بالا (HPLC) در 40 نمونه (از هر دامداری در هر فصل دو نمونه) اندازه‌گیری گردید. همه نمونه‌ها ازنظر آزمون‌های اسیدیته، دانسیته، پروتئین، درصد آب، پروتئین، چربی و شمارش کلی میکروبی ارزیابی شدند. نتایج نشان داد مقدار آفلاتوکسین M1 در شیرهای فصل زمستان اندکی بالاتر از فصل تابستان بود گرچه این اختلاف معنی‌دار نبود. از بین 40 نمونه موردبررسی، در 5 نمونه (5/12 درصد) آفلاتوکسین M1 از حد مجاز تعیین شده در استاندارد ملی ایران (ng/ml 50) بالاتر بود. مقدار چربی، پروتئین و دانسیته در نمونه‌های شیر فصل زمستان بیشتر از فصل تابستان بود (05/0P<)، اما اختلاف معنی‌داری بین نمونه‌های شیر دامداری‌های صنعتی و مراکز جمع‌آوری شیر وجود نداشت. تعداد 93 درصد نمونه‌ها در فصل زمستان و 100 درصد نمونه‌ها در فصل تابستان، آلودگی بیش‌ازحد مجاز تعیین شده در استاندارد ملی داشتند. با توجه به نتایج این بررسی، برای کاهش بار میکروبی شیر خام باید روش‌های مناسبی به‌کار گرفته شده و به دامداران آموزش‌های لازم در خصوص نحوه دوشش و نوع تغذیه دام ارائه شود و علاوه بر آن نمونه‌های شیر حتماً باید ازنظر مقدار آفلاتوکسین M1 نیز موردبررسی قرار گیرند.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of season and farming system on aflatoxin M1 content and raw milk quality

نویسندگان [English]

  • M. Jalili 1
  • F. Kiani 2
1 Associated Professor, Departmen of Food, Faculty of Food Industries and Agriculture, Standard Research Institute (SRI), Karaj, Iran.
2 Quality control management, Kimia Laban factory, Khorramabad, Iran
چکیده [English]

The quality of raw milk plays an important role in the quality of dairy products. The current study was aimed to investigate the effect of season and farming system on aflatoxin M1 content and raw milk quality. For this reason, 600 samples were collected from 5 industrial farms and 5 milk collection centers of Khorramabad city during the summer and winter of 2017 (300 samples in each season). The contamination level of aflatoxin M1 was measured by high-performance liquid chromatography (HPLC) in 40 samples (4 samples from each farm). All samples were investigated in terms of acidity, density, protein, water percent, protein, fat and total bacterial count. The results showed the aflatoxin M1 in 5 samples (12.5%), was higher than the permitted level of National Standard (50 ng / ml). The amount of fat, protein, and density of samples collected in the winter was higher than those collected in the summer (P< 0.05). There was no significant difference between the aflatoxin M1 level in milk samples of industrial farms and milk collection centers. Moreover, the total bacterial count of 93% and 100% of the samples collected during summer and winter has exceeded the permissible limit specified in the National Standard, respectively, It could be concluded that in order to reduce the microbial load of raw milk, appropriate methods should be applied and the livestock breeders should be provided with the necessary training on how to milk and feed the animal. Moreover, the raw milk delivered to dairy factories should also be considered for aflatoxin M1.

کلیدواژه‌ها [English]

  • Aflatoxin M1
  • raw milk
  • chemical characteristics
  • microbial characteristics
  • Livestock

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