Disclosed in the disclosure is a method for detecting acetaldehyde in wine samples using fluorescent probes, belonging to the field of wine quality control. The detection method of the disclosure is used for measuring acetaldehyde in wines based on fluorescent probes. Under the acidic condition of pH=2.0, the specific binding between the fluorescent probe and acetaldehyde is realized according to the principle of photoelectron induced transfer. The fluorescent probe has a good linear relationship with the concentration of acetaldehyde in a range of 0-200 mg/L, the limit of detection (LOD) is 3.6×10.sup.−8 mol/L, and the recovery rate of samples is 94.02-108.12%. The detection method has the advantages including low cost, wide linear range, high sensitivity, and being fast and accurate. The fluorescent probe is successfully applied to the detection and analysis of wine samples and samples in a beer fermentation process.

Provided is a method for quantitating a saccharide in a liquid sample. The method comprises incubating the liquid sample with 2,3-naphthalenediamine in the presence of iodine to allow a naphthimidazole group to be linked to the saccharide to obtain a first mixture; obtaining an .sup.1H-NMR spectrum of the first mixture; and comparing, in said .sup.1H-NMR spectrum, the intensity or integral of a proton signal corresponding to the saccharide to the intensity or integral of a proton signal corresponding to an internal standard present in the first mixture.

Compositions containing monoamine oxidase inhibitors prepared by removal of alcohol from agave-derived beverages are disclosed.

Information relating to a change made to a concrete mixture in a concrete mixer truck is obtained. An expected value of a selected characteristic of the concrete mixture is determined based on the change. A representation of the expected value is displayed on a processing device located in a cab of the concrete mixer truck. In one embodiment, the mixture comprises a concrete mixture. The change may comprise an addition of water to the mixture.

A photo acoustic non-destructive measurement apparatus and method for quantitatively measuring texture of a liquid. The apparatus includes a laser generating tool, an acoustic capturing device, and a data processing unit. The laser generating tool directs a laser towards a surface of a liquid contained in a container and creates pressure waves that propagate through the air and produce an acoustic signal. The acoustic capturing device records and forwards the signal to a data processing unit. The data processing unit further comprises a digital signal processing module that processes the received acoustic signal. A statistical processing module further filters the acoustic signal from the data processing unit and generates a quantitative acoustic model for texture attributes such as hardness and fracturability. The quantitative model is correlated with a qualitative texture measurement from a descriptive expert panel. Textures of liquids are quantitatively measured with the quantitative acoustic model.

A photo acoustic non-destructive measurement apparatus and method for quantitatively measuring texture of a liquid. The apparatus includes a laser generating tool, an acoustic capturing device, and a data processing unit. The laser generating tool directs a laser towards a surface of a liquid contained in a container and creates pressure waves that propagate through the air and produce an acoustic signal. The acoustic capturing device records and forwards the signal to a data processing unit. The data processing unit further comprises a digital signal processing module that processes the received acoustic signal. A statistical processing module further filters the acoustic signal from the data processing unit and generates a quantitative acoustic model for texture attributes such as hardness and fracturability. The quantitative model is correlated with a qualitative texture measurement from a descriptive expert panel. Textures of liquids are quantitatively measured with the quantitative acoustic model.

A method and system for monitoring wine fermentation is provided. The system comprises a sensor conduit and a sensor enclosure. The sensor enclosure comprises a leveling indicator that indicates if the sensor conduit is vertical.

A plug for a container for storing liquid includes a housing and an input end at an end of the housing, where the input end allows gas flow to pass through. A first sensor is in a first sensor chamber inside the housing, the first sensor being configured to detect a phenol. A first filter is between the input end and the first sensor, where the first filter selectively allows the phenol to pass through. A first flow pathway is between the first input chamber and the first sensor chamber.

A method of determining a constituent related sample property of a multi-constituent sample comprising: subjecting the sample to a perturbation selected to induce a time dependent change in measurement data associated with a constituent related to the sample property to be determined; recording a time-series of measurement data following subjecting the sample to the perturbation; and determining the sample property from the application to the recorded time-series of measurement data of a calibration correlating the sample property with time-series of measurement data, said calibration being empirically derived from chemometric time-series modelling of time-series measurement data recorded for each of a plurality of reference samples following subjecting each reference sample to the perturbation, each reference sample having a different known values of the sample property.

A portable electronic alcohol-testing device is provided that uses vaporization and sensitive pressure guages to approximate the alcohol content of a solution. The device may be used, for example, to determine the relative alcohol content of a mixed beverage.