The soluble sugar (SS), titratable acid (TA), alcohol, total SO2, and free SO2 of the wine were determined by the method of OIV [22 ]. The pH was measured with a Mettler Toledo FE20 Desktop pH Meter (Mettler Toledo Instruments Co. Ltd., Shanghai, China).
Fe20 desktop ph meter
Manufactured by Mettler Toledo
Sourced in China
The Mettler Toledo FE20 Desktop pH Meter is a reliable and accurate instrument designed for laboratory applications. It features a digital display and measures pH, mV, and temperature. The device is capable of performing basic pH measurements.
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Lab products found in correlation
6 protocols using fe20 desktop ph meter
1
Wine Chemical Composition Analysis
2
Berry Juice Characterization Protocol
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A subsample of 100 berries was weighted, and then manually pressed. The must was centrifuged for 5 min at 8000 rpm, and the supernatant was determined for titratable acidity, pH, and total soluble solids (TSS), according to the method described by Wang et al. [34 (link)]. Determination of titratable acidity was conducted by titration with NaOH (0.05 M) to the end point of pH 8.2. Besides, titratable acidity was expressed as tartaric aid equivalent according to the National Standard of the People’s Republic of China (GB/T15308-2006, 2006). The Mettler Toledo FE20 Desktop pH Meter (Mettler, Toledo, Switzerland) was used for measuring the juice pH. Juice TSS was determined using the PAL-1 digital hand-held refractometer (Atago, Tokyo, Japan).
3
Fruit Juice Analytical Methods
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Brix values were determined with a hand-held digital Atago PAL-1 meter (Atago Co. Ltd., Tokyo, Japan) and the pH was measured with a Mettler Toledo FE20 Desktop pH Meter (Mettler Toledo Instruments Co. Ltd., Shanghai, China) [31 ]. The TPC was determined by the method by Xu et al. and the TAC was estimated according to the pH differential method by Meng et al. [32 (link),33 (link)].
4
Comprehensive Fruit Quality Analysis
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A digital Atago PAL-1 m (Atago Co. Ltd., Tokyo, Japan) was used to analyze the total soluble sugar (°Brix) content of the samples. Titratable acid was determined according to the methods of Wang et al. [16 ]. The pH value was determined by a Mettler Toledo FE20 Desktop pH meter (Mettler Toledo Instruments Co. Ltd., Shanghai, China). The determination of total anthocyanins was performed on the basis of the pH differential methods of Ju et al. [17 (link)]. Three technical replicates were analyzed for each sample.
5
Grape Maturity Profiles in Northwest China
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Four Vitis vinifera wine grape cultivars: Syrah, Muscat Tchervine, Gewürztraminer and Chardonnay were collected in the same commercial vineyard in Gaotai, Gansu Province in the northwest of China. The vines were cultivated in 2001 and were arranged in north-south oriented rows spaced 2.0 m apart with a distance of about 1.0 m between two plants in each row. The management of the vineyards was in accordance with the local wine grape production technical rules. Grape berries were collected at 18, 32, 44, 60, 74, 88, 102 and 107 DAFs for Syrah and Chardonnay in 2010; 17, 31, 43, 59, 73, 87, 101 and 106 DAFs for Muscat Tchervine and Gewürztraminer in 2010; and 32, 48, 60, 75, 89, 102 and 112 DAFs for Syrah, Muscat Tchervine and Gewürztraminer grapes in 2011 vintage.
Total soluble solids (TSS) were determined with a PAL-79S Digital Hand-held “Pocket” Wine Refractometers (Atago Co., Ltd., Guangzhou, China). pH value was measured by Mettler Toledo FE20 Desktop pH Meter (Mettler Toledo Instruments Co., Ltd., Shanghai, China). The TSS and pH of the grapes are shown inTable 2 . Climatic data of the region was obtained from China Meteorological Data Sharing Service System (available at: http://cdc.cma.gov.cn/home.do ) and shown in Figure S1 .
Total soluble solids (TSS) were determined with a PAL-79S Digital Hand-held “Pocket” Wine Refractometers (Atago Co., Ltd., Guangzhou, China). pH value was measured by Mettler Toledo FE20 Desktop pH Meter (Mettler Toledo Instruments Co., Ltd., Shanghai, China). The TSS and pH of the grapes are shown in
6
Fruit Juice Quality Analysis
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Fresh 100 g fruit was squeezed to determine juice total soluble solids (TSS), measured using a portable hand-held dialyzer digital Atago PAL-1 meter (Atago Co. Ltd., Saitama, Japan), and the titratable acidity (%) was titrated with 0.1 mol/L NaOH. pH was measured with Mettler Toledo FE20 Desktop pH Meter (Mettler Toledo Instruments Co. Ltd., Shanghai, China) [83 (link)].
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