بررسی ویژگی های شیمیایی و میکروبی شیره خرما در طول مراحل تولید (از ماده اولیه تا محصول نهایی)

نویسندگان
نوشین نوشیروانی 1
عاطفه محبی 2
1 دانشگاه بوعلی سینا
2 دانشگاه آزاد اسلامی همدان
10.22034/FSCT.20.139.110
چکیده
هدف از این پژوهش بررسی ویژگی­های شیمیایی و میکروبی شیره خرما طی مراحل مختلف تولید از ماده اولیه تا محصول نهایی می­باشد. مقادیر ماده جامد محلول، pH، اسیدیته، قند کل و احیاء کننده، محتوای ترکیبات پلی فنولی، فعالیت آنتی اکسیدانی و شمارش میکروبی اندازه گیری شده و تعیین نوع میکروارگانیسم­ها بر اساس ویژگی­های فنوتیپی در مراحل مختلف تولید انجام شد. نتایج بدست آمده نشان داد طی مراحل شفاف سازی و تغلیظ شربت به تدریج pH کاهش و اسیدیته، قند کل، قند احیاء کننده و ماده جامد کل افزایش یافت و در شیره به حداکثر خود رسید. مقایسه شیره سنتی با شیره تولیدی کارخانه pH بیشتر و اسیدیته، قند کل و احیاء کننده، ماده جامد کل، ترکیبات پلی فنولی و فعالیت آنتی اکسیدانی کمتری برای شیره سنتی نشان داد. به طور کلی محتوای ترکیبات پلی فنولی و فعالیت آنتی اکسیدانی در مراحل مختلف تولید به تدریج کاهش یافت به طوری که شیره خرما (279 میلی گرم اسید گالیک بر 100 گرم نمونه و 33%) به طور معنی داری محتوای ترکیبات پلی فنولی و فعالیت آنتی اکسیدانی کمتری نسبت به خرما (388 میلی گرم اسید گالیک بر 100 گرم نمونه و 57%) نشان داد. نتایج آزمون میکروبی کمترین بار میکروبی برای شیره تولیدی در مقایسه با خرما و شربت­های مختلف را نشان داد. هر چند حضور باسیلوس لیچنی فورمیس در شیره احتمال ترش شدن فرآورده را فراهم می آورد و یافتن راهکاری مناسب برای افزایش مدت زمان ماندگاری محصول در این خصوص ضروری به نظر می­رسد. شیره سنتی بار میکروبی کمتری نسبت به شیره تولیدی نشان داد هر چند باکتری­ باسیلوس لیچنی فورمیس نیز در شیره سنتی با وجود تیمار حرارتی بالا مشاهده شد. بر اساس نتایج بدست آمده شیره خرما عاری از کلی فرم بود که بیانگر حفظ اصول بهداشتی حین تولید می باشد.
کلیدواژه‌ها
خرما
شیره
خواص میکروبی
خواص شیمیایی

موضوعات

عنوان مقاله English

Investigating the chemical and microbial characteristics of date syrup during the production stages (from the raw material to the final product)

نویسندگان English

nooshin noshirvani 1
Atefeh Mohebi 2
1 Bu Ali Sina University
2 Islamic Azad University of Hamedan
چکیده English

The purpose of this study is to investigate the chemical and microbial properties of date syrup during different stages of production line from the raw material to the final product. The amounts of total soluble solids, pH, acidity, total and reducing sugars, polyphenolic compounds, antioxidant activity and microbial count were measured and the type of microorganisms was determined based on phenotypic characteristics in different stages of production. The obtained results showed that during the stages of juice clarification and concentration, pH gradually decreased and acidity, total sugar, reducing sugar and total solid matter increased and reached their maximum in the syrup. Comparison of traditional syrup with factory produced syrup showed more pH and acidity, total and reducing sugar, total soluble solid, polyphenolic compounds and lower antioxidant activity for traditional syrup compared to the produced one. In general, the content of polyphenolic compounds and antioxidant activity gradually decreased in different stages of production, so that date syrup (279 mg of gallic acid per 100 grams of sample and 33%) indicated higher content of polyphenolic compounds and antioxidant activity than dates (388 mg of gallic acid per 100 g of sample and 57%). The results of the microbial test showed the lowest microbial load for the produced syrup compared to dates and different syrups. However, the presence of B. licheniformis in the syrup makes the product sour, in this regard finding a suitable solution to increase the shelf life of the product seems necessary. The traditional syrup showed a lower microbial load than the produced syrup, although B. licheniformis was observed in the traditional syrup despite the high heat treatment. Based on the obtained results, the date syrup was free of coliforms, which indicates maintaining the hygienic principles of manufacture during the production line.

کلیدواژه‌ها English

Dates
syrup
Microbial properties
Chemical properties
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