بررسی و مقایسه آلودگی اکراتوکسین a و عناصر فلزی سرب و آرسنیک در پودرهای تجاری قهوه فوری

دانه قهوه دومین فرآورده سودآور تجاری در دنیا می‌باشد و علاوه بر مصرف نوشیدنی در صنایع غذایی کاربرد فراوانی دارد. در تهیه بستنی، شیرینی‌ و شکلات استفاده می‌شود. گیاهان مهمترین مسیر انتقال فلزات سنگین به زنجیره غذایی انسان و چرخه طبیعت محسوب می‌شوند. فلزات سنگین به‌دلیل غیر­ابل تجزیه بودن، اثرات سوء آنها بر سلامتی موجودات زنده و انسان حائز اهمیت می‌باشد. لذا هدف از این تحقیق، بررسی و مقایسه خصوصیات فیزیکوشیمیایی، آلودگی اکراتوکسین a، عناصر فلزی سرب و آرسنیک در 4 نمونه پودر قهوه فوری eagle lux، good day،nestle  و torabika می‌‌باشد. در مقایسه نتایج به‌دست آمده با حدود مجاز استانداردهای ملی و بین المللیwho، همه نتایج در محدوده مجاز استاندارد (ph (محلول 10%) 5 تا 7، رطوبت حداکثر 4% (گرم در 100 گرم ماده خشک)، قند کل حداکثر 72% (گرم در 100 گرم ماده خشک بدون چربی)، خاکستر 4% (گرم در 100 گرم ماده خشک بدون چربی)، چربی در پودر کاپوچینو حداکثر 30% (گرم در 100 گرم ماده خشک)، کافئین بر اساس ماده خشک حداکثر 2.8% ، سرب 0.5 میلی‌گرم بر کیلوگرم، آرسنیک 1 میلی‌گرم بر کیلوگرم، اکراتوکسین 10ppb) قرار داشتند. بیشترین مقدار ph (0.05±6.83) در نمونه good day و پایین­ترین مقدار ph در نمونه nestle تعیین گردید. کمترین مقدار خاکستر (%0.05±2.38)، رطوبت (%0.05±1.41)، سرب (0.000± 0.026 میلی‌گرم بر کیلوگرم) و آرسنیک (0.000 ±0.013 میلی‌گرم بر کیلوگرم) در نمونه torabika مشاهده شد. مقدار سرب در نمونه‌های good day و torabika مشابه تعیین گردید. بیشترین مقدار کافئین (0.05±0.23 درصد وزنی) در نمونه good day حاصل شد. در تمام نمونه­ها میزان اکراتوکسین  aمنفی بود. کمترین مقدار قند کل (0.05±42.75 گرم در صد گرم) در نمونه nestle مشاهده شد. نمونه torabika به‌ دلیل ناچیز بودن مقدار سرب، آرسنیک، خاکستر و چربی موجود در آن، همچنین پایین بودن مقدار رطوبت به‌عنوان بهترین نمونه پیشنهاد می­شود.

Evaluation and comparison of ochratoxin a contamination and metallic elements lead and arsenic in commercial instant coffee powders

Introduction: Coffee is the second most profitable commercial products in the world and in addition to beverage consumption, it is widely used in food industry. Among natural sources, coffee has the highest amount of caffeine. The amount of caffeine in coffee varies depending on the variety of coffee and how it is brewed. Coffee beans contain other compounds such as phenol, magnesium, potassium and fiber. Plants are the most important route for the transfer of heavy metals to the human food chain and the natural cycle. Heavy metals in the body can cause everything from biochemical changes in low levels of contamination to effects on the nervous system and even death in high concentrations. They slow down the reaction with enzymes and even stop the body’s essential physiological reactions and have the ability to be stored in the bones, which enter the bloodstream after being saturated in the bone. Heavy metals are important because they are nondegradable in the human body. Contamination with mycotoxins in coffee beans such as ochratoxin produced by Aspergillus and Penicillium occurs under the influence of environmental conditions such as temperature, humidity, water activity, transport conditions, storage until consumption. Therefore, the aim of this study was to investigate and compare the physicochemical properties, fungal contamination and metal elements in 4 samples of instant coffee powder Eagle Lux, Good Day, Nestle and Torabika. Materials and Methods: In 4 samples of instant coffee powder fat, moisture, ash, pH, total sugar, caffeine (using HPLC), ochratoxin A contamination (using HPLC) and lead and arsenic metallic elements (using hydride atomic absorption spectroscopy) were determined. The results were reviewed and compared with national and international standards. All experiments were performed in a completely randomized design. Data analysis was performed using SPSS software. The means were compared using Duncan’s test at 5% probability level. Results and Discussion: Comparing the results obtained with the permissible limits of national and international WHO standards, all results are within the permitted standard range (pH 5 to 7, maximum moisture 4%, total sugar maximum 72%, ash 4%, fat in cappuccino powder maximum 30%, Caffeine was based on dry matter up to 2.8%, lead 0.5 mg/ kg, arsenic 1 mg/ kg, ochratoxin 10 ppb). The highest pH value (6.83± 0.05) was determined in Good Day sample. The low pH in the Nestle sample may be due to acid rain and low soil pH in the exporting countries. Minimum amount of ash (2.38± 0.05%), moisture (1.41± 0.05%), lead (0.026± 0.000 mg / kg) and arsenic (0.013± 0.000) mg / kg) was observed in Torabika sample. Lead level was similar in Good Day and Torabika samples. The highest amount of caffeine (0.23 ±0.05 wt %) was obtained in Good day sample. Ochratoxin A was not detected in all samples. The lowest amount of total sugar (42.75± 0.05 g /100 g) was observed in Nestle sample. Therefore, it is the most suitable sample for diabetic patients. Torabika sample is recommended as the best sample due to the low amount of lead, arsenic, ash and fat, as well as low moisture content. With increasing moisture and sugar, the possibility of liquid steps forming between particles increases and this causes the degree of cohesion and agglomeration of the powder and the marketability of the powder disappears. Increased mineral consumption causes disease due to inhibition of the mechanism of control of absorption in the small intestine and accumulation in the body. Therefore, as the amount of total ash in coffee increases, its adverse effects on the body intensify. Torabika is the most suitable sample for people with cardiovascular disease due to the lower fat content.