Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Assessment of Nutritional Composition and Heavy Metal Content in Some Edible Mushroom Varieties Collected from Different Areas of Bangladesh

Dr. K. M. Mohiuddin
Department of Agricultural Chemistry, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Md. Mehediul Alam
Department of Agricultural Chemistry, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Md. Taufique Arefin
Department of Agricultural Chemistry, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Istiaq Ahmed
Department of Agricultural Chemistry, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

Four edible mushroom species (Pleurotus ostreatus, Agaricus bisporus, Volvariella volvacea, Ganoderma lucidum) from different locations of Bangladesh, were analyzed for their protein and metal content profile (K, Na, Fe, Cu, Zn, Mn, Cr, Pb, As and Cd). Trace metals were determined by atomic absorption spectrophotometer, Na and K by flame emission spectrophotometer and protein by micro Kjeldhal method. All element concentrations were determined on a dry weight basis. The protein content of mushrooms varied from 13.8%–34.3% and the metal content of samples ranged from 0.54–2.25% for K and 12.6–81.6, 69.5–626.2, 39.2–163.4, 30.1–75.5, 52.9–104.5, 0.20–0.30, 0.13–0.59 µg g^-1 for Na, Fe, Cu, Zn, Mn, Cd, Pb, respectively. Arsenic and cadmium concentrations were below the detection limit of the method used. The detection limits of the method for As and Cd are 0.01 µg g^-1 for each element. In general, K and Fe content were higher than other metals in all mushroom species. The levels of Cu and Zn in some mushroom samples were found to be higher than legal limits.

Keywords: Edible mushrooms, Heavy metal, Nutritional composition

Location: National Mashroom Development and Extension Centre, Dhaka and Mashroom Sub-center of Comilla, Chittagong, Mymensingh, Sylhet and Khulna city of Bangladesh

Start Date: 00-00-2014

End Date: 00-00-2014

Program Area: Risk Management in Agriculture

Commodity: Mushroom

Objectives:

To document basic chemical and metal concentrations in some edible mushrooms, collected from different districts of Bangladesh.

Methodology:

The mushroom samples were collected from National Mashroom Development and Extension Centre, Dhaka and Mashroom Sub-center of Comilla, Chittagong, Mymensingh, Sylhet and Khulna city of Bangladesh during early 2014. The collected samples were washed with deionized water and dried at 105°C for 24 hrs. Dried samples were homogenized using an agate homogenizer and stored in pre-cleaned polyethylene bottles until the analysis started. All reagents were of analytical reagent grade, 69–72% HNO₃, 30% H₂O₂, and 70% HC_lO₄ were used for digestion of samples. Double deionized water was used for all dilutions. During the experiments, all glasswares and equipment were carefully cleaned starting with 2% HNO₃ and ending with repeated rinsing distilled deionized water to prevent contamination. Samples (0.6 g) were digested with 10 ml of HNO₃, 2 ml of H2O2, and 4 ml of HClO₄ in block digester system maintained temperature 180-200°C until white fumes are evolved and finally diluted to 50 ml with 2% nitric acid. All sample solutions were clear. A blank digest was carried out in the same way. Heavy metals (Fe, Cu, Zn, Mn, Cr, Pb, As and Cd) concentration in the extract were determined by atomic absorption spectrophotometer (SHIMADZU AA-7000), using a deuterium background correction. The crude protein content of the samples was estimated by the micro Kjeldhal method, in which the sample was digested with a known quantity of concentrated sulphuric acid in the block digester. The digested material was distilled after the addition of alkali. The released ammonia was collected in 4% boric acid in the distillation unit. The resultant boric acid, now contained the ammonia released from the digested material, was then titrated against 0.1 NHCl, manually. The nitrogen content thus determined was multiplied by a factor of 6.25 to arrive at the amount of crude protein. Sodium and potassium were determined by flame emission spectrophotometer.

Source of Information: Asian J. Med. Biol. Res. 2015, 1 (3), 495-501; ISSN 2411-4472 (Print) 2412-5571 (Online)

Article Link (Online Journal): doi: 10.3329/ajmbr.v1i3.26468, www.ebupress.com/journal/ajmbr

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, the detected levels of Fe, Zn, Mn and Pb were generally in agreement with previously reported. But the Cu contents were higher than those reported earlier and the Cr levels were lower than literature values. In general, the levels of Cu and Zn in some mushroom samples were found to be higher than legal limits.

Knowledge Management: Journal