The proposed method was employed in the analysis of environmental water samples from wastewater treatment plants (WWTPs) from Santiago, Chile. All collected samples were stored in amber glass bottles without headspace and stored at −18 °C until analysis (in triplicate). The WWTPs samples were filtered before analysis using a 2.7 µm Whatman nylon membrane filters, followed by a 1 µm glass fiber filter, and finally 0.45 µm Whatman nylon membrane filter (Whatman, Kent, UK), to prevent the introduction of particulate material in to the HPLC.
Whatman nylon membrane filter
Manufactured by Cytiva
Sourced in United Kingdom
Whatman nylon membrane filters are laboratory filtration products designed for a variety of applications. They are constructed from nylon material and provide consistent pore size and flow characteristics. These filters are suitable for general filtration tasks in research and industrial settings.
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Lab products found in correlation
3 protocols using whatman nylon membrane filter
1
Environmental Water Sample Analysis
2
Water Quality Sampling Across Yangtze River Catchment
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Water samples were collected from 51 sampling sites located in two rivers (the Yangtze River catchment of Wuhan and Han River) and four lakes (Tangxun Lake, Dong lake, Liangzi Lake and Hou Lake) in May 2020 (Fig. 2 ). We ensured that the sampling points covered the entire study area. The Yangtze River and Han River contained a total of 10 and 6 sampling locations, respectively. The number of sampling sites in Tangxun Lake, Dong lakes, Liangzi Lake, and Hou Lake was 10, 8, 11, and 6, respectively. The samples were packed in amber glass bottles without allowing any headspace and refrigerated immediately. Later, the samples were brought back to the laboratory, filtered using Whatman nylon membrane filters (pore size of 0.2 μm; 47 mm diameter; Germany), and stored at 4℃ for subsequent analysis.Fig 2 ![]()
Location of the sampling sites. CJ: Yangtze River; HJ: Han River; TX: Tangxun Lake; DH: Dong lakes; HH: Hou Lake; LZH: Liangzi Lake.
3
Analysis of Maillard Reaction Products in Coffee
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For the analysis of MRPs from the different samples, 2 g of dried coffee powder was mixed with 50 ml of distilled water. The mixture was heated at 100°C and stirred at 150 rpm (magnetic stirrer, iT‐0713; Shanghai Yiheng Scientific Instruments Co., Ltd., China) for 1 hr. The extract containing MRPs was filtered through a Whatman nylon membrane filter (0.45 μm) and stored at 4°C. The absorbances of the filtered extract at 294 and 420 nm were measured using a UV spectrophotometer (Ajandouz, Tchiakpe, Ore, Benajiba, & Puigserver, 2001 ). The absorbance ratio (A294/A420) was calculated to monitor the transformation of UV‐absorbing compounds into brown polymers. Each sample was determined in triplicate.
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