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A laboratory “tongue” made with one fluorescent polymer distinguished patterns from 25 commercial fruit juices—not by tasting them like a person, but by measuring how the samples changed the polymer’s fluorescence. In a 2017 study, researchers combined readings at three pH levels with statistical classification to identify the tested apple, grape, and blackcurrant juices.
How can one polymer tell juices apart?
The sensor used a positively charged fluorescent polymer called P2, a poly(para-phenyleneethynylene). When constituents in a juice interact with the polymer, its fluorescence is quenched: the emitted light changes in intensity. The researchers measured those responses under three conditions—pH 3, pH 7, and pH 13—then used linear discriminant analysis (LDA) to classify the resulting patterns.
In effect, the polymer produced a chemical fingerprint for each sample. The statistical method looked for patterns that separated the tested juices. The “tongue” is therefore an optoelectronic sensing and classification system, not a material that physically tastes or recognizes flavor as a human does.
What did the study distinguish?
The team reported discriminating 25 commercial juice products: 14 apple juices, six grape juices, and five blackcurrant juices. These are the samples tested in the paper, not evidence that the method can identify every juice, brand, or formulation. The Royal Society of Chemistry’s paper describes the method and its results.
#1 Best Overall
- It is designed for measuring sugar content in fruit, honey, maple syrup and other sugary drink.
- It is portable and needs no battery, it is easy to learn and use even for new user.
- Automatic temperature compensation function minimizes the effect of the temperature on testing result.
- It's 0-80% large scale range makes it be suitable in wider field.
- Includes: a firm plastic case, a refractometer ,a cleaning cloth, a screw driver, an operating instructions, some pipettes.
What are the method’s limits?
The researchers also tested a negatively charged fluorescent polymer, P1. It discriminated samples too, but required 50 times the analyte concentration used for P2. That result is a specific comparison in this study; it does not establish that P1 is inferior in every application or operating condition.
Mixtures exposed limits in classification. Some mixtures of blackcurrant and red grape were classified as red grape. A red-and-green grape mixture was classified as red grape when it contained more than 70% red grape. These cases show why “distinguish” should be understood as successful classification of the reported samples and conditions, not perfect identification of arbitrary mixtures.
Rank #2
- Note: For Brix and Gravity Test ONLY! NOT FOR Salinity-Honey-Antifreeze-Animal Clinical! Designed for Sugar & Malt Density Testing: Equipped with automatic temperature compensation (ATC), our lab refractometer measures 0-32% sugar content and 1.000-1.130 Specific Gravity (SG) in various liquids.
- Quick Calibration, No Power Required: Achieve accurate measurement in seconds with 1-2 drops of liquid on the brix meter, close the cover plate. Then read Brix & SG values in a bright light - needing no batteries or other tools.
- Dual Scale Sugar Level Tester Compatibility: grapes juice, cider / apple juice, orange juice and other fruit juices, wort, Kambucha, low-sugar solution, ideal for home brewing, agriculture, laboratory use, or food fermentation.
- Durable & Portable Design: Made with high quality chromium alloy, this sugar refractometer is durable and lightweight, allowing you to carry it in your pocket. Whether you’re in a laboratory, kitchen, or garden, sugar checker is ideal for beer making fermentation and sugar content measurements.
- What can you get? 1X high-precision sugar content checker (0-32%) and wort density (1.000-1.130) measuring instrument, 1X lens cleaning cloth, 1X instruction manual, 1X dipping test tubes, 1X 24-hour service, and lifetime technical support.
Is this a practical juice-testing product?
The 2017 work is a laboratory proof of concept. The cited paper and coverage do not establish a retail sensor, an at-home test, universal juice identification, or routine commercial quality-control performance. Chemistry World reported that corresponding author Uwe H. F. Bunz hoped the sensor might eventually help with quality control of expensive beverages or detect counterfeit alcoholic drinks. Those were proposed future uses, not demonstrated deployments. Chemistry World’s 2017 coverage discusses the researchers’ aspirations and the study.
Who reported the research, and when?
Jinsong Han, Benhua Wang, Markus Bender, Kai Seehafer, and Uwe H. F. Bunz reported the work in the journal Analyst. The journal record lists first publication on 16 January 2017. The journal entry provides the publication record and paper details.
Quick Recap
Best Value
- ACCURATE READINGS : The Brix refractometer can measure brix between 0-32%±0.2% and Specific Gravity between 1.000-1.130, Brix Accuracy: +/-0.2%.
- ADVANCED AUTOMATIC TEMPERATURE COMPENSATION（ATC）TECHNOLOGY (10℃~30℃)： Adjust Automatically to Compensate for Temperature, Which makes it even easier to get fast results.
- SIMPLY USE: Using the dropper to take a sample of wort and put it on the prism. Then hold the refractometer up to the light and look scale through the eyepiece, more accurate to measure sugars in verities of melon, fruits or juice.
- WIDE USE: The Brix Refractometer is ideal for Home Brew, Agricultural, Gardening & Educational Purposes, sugar content.
- PORTABLE SUGAR CONTENT TESTER: Easy to use, sturdy design, compact in size and light in weight, convenient to keep up and carry around.
Rank #4
- Digital Brix Refractometer: LOHAND Brix Refractometer is specifically designed for testing the Sugar concentration of Honey Syrup, fruits, Juices, Drinks, Coffees, Vegetables, Beverages, Wine Processing and Other Sugary Food, Cutting Fluid. Ideal for Orchard, Home Brew, Agricultural, Gardening, Education, Laboratory, Food Processing, Jam Factory and Outdoors.
- 3 IN 1 Multi-function: Digital Refractometer LH-T95 measures Brix(sugar content), Refractive Index(RI), and features ATC, with all parameters clearly displayed on a large color screen for easy reading. Its multi-parameter detection ensures high accuracy. Featuring high-quality optical components, the interior incorporates a precision optical system with high-refractive-index lenses.
- High Precision Measurement: Consistently accurate readings of 0-95% Brix and Resolution: 0.1%, Accuracy: ±0.3. With Automatic Temperature Compensation (ATC) function, Press the measurement button for automatic high-precision results in under 3 seconds. Easy to learn and use, even for first-time users. It is an ideal tool for both adults and young, whether for household or professional applications.
- Ideal Design: Compact and lightweight for easy portability, industrial-grade components ensure extended product life, durable, the prism can be washed with water(Do not wash the main body or submerge the device in water),Waterproof IP65. Battery-powered with auto-shutoff functionality. Touch and button detection are user-friendly, highly adaptable, and simple to use.
- What You Gain: 1x LH-T95 Digital Brix Refractometer, 2x AAA Batteries, 1x User Manual, 1x cleaning cloth, 1x Sample empty bottle, 1x screw driver and pipettes. Friendly customer service, 1-year warranty, and lifetime technical support.
Rank #3
- WIDE BRIX RANGE: This Brix refractometer measures sugar content from 0-90%, perfect for testing the sweetness in honey, fruit, maple syrup, and other sugary drinks. Please note, it measures sugar content only, not honey moisture.
- WHAT’S INCLUDED: Your package comes with everything you need: the refractometer, a protective box, cleaning cloth, screwdriver for calibration, user manual, and a plastic pipette for easy sampling.
- EASY AND ACCURATE READINGS: With just 2-3 drops of liquid, the high-definition prism gives you clear and accurate results. This Brix meter works great for checking sugar levels in various liquids like honey, fruit juices, maple syrup, and more.
- LIGHTWEIGHT AND PORTABLE: Despite its sturdy construction, this handheld refractometer is lightweight and compact. It’s easy to carry and convenient for on-the-go testing with all included accessories.
- VERSATILE APPLICATIONS: Ideal for measuring sugar content in everything from honey to fruit juices, this Brix refractometer is also useful for homebrewing and winemaking. While it does not have an SG wort scale, it effectively measures sugar levels before and after fermentation, helping you monitor your brew’s progress.
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