Related Experiment Video
Updated: Apr 27, 2026
05:29
Profiling Volatile Compounds in Blackcurrant Fruit using Headspace Solid-Phase Microextraction Coupled to Gas Chromatography-Mass Spectrometry
Published on: June 9, 2021
3.5K
Sunlight exclusion from Muscat grape alters volatile profiles during berry development
Haohao Zhang1, Peige Fan2, Cuixia Liu3
1Beijing Key Laboratory of Grape Science and Enology, and CAS Key Laboratory of Plant Resources, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
Food Chemistry
|July 6, 2014
Summary
Sunlight exclusion alters grape aroma compounds. Inhibiting sunlight reduces terpenes but increases aldehydes, alcohols, and ketones, impacting the final flavor profile of grapes.
Area of Science:
- Viticulture
- Plant Physiology
- Analytical Chemistry
Background:
- Grape volatile compounds significantly influence wine and table grape aroma.
- Sunlight exposure is a critical factor affecting grape berry development and metabolism.
- Understanding how environmental factors modify volatile profiles is essential for grape quality control.
Purpose of the Study:
- To investigate the impact of sunlight exclusion on the volatile composition of 'Jingxiangyu' grape berries at different developmental stages.
- To determine how altered light conditions affect the synthesis and accumulation of key aroma compounds, such as terpenes and aldehydes.
Main Methods:
- Grape clusters were enclosed in specialized boxes to exclude sunlight during specific berry development phases.
- Volatile compounds in ripe berries were analyzed to assess changes in profiles due to sunlight exclusion.
- Gas chromatography-mass spectrometry (GC-MS) was likely employed for detailed volatile compound identification and quantification.
Main Results:
- Sunlight exclusion altered the overall volatile profiles of grape berries across all investigated stages.
- A significant inhibition in terpene synthesis and accumulation was observed under sunlight exclusion, impacting Muscat aroma characteristics.
- Conversely, excluding sunlight during berry formation and veraison led to increased accumulation of aldehydes, alcohols, and ketones during ripening.
Conclusions:
- Sunlight plays a crucial role in regulating the metabolic pathways responsible for volatile compound synthesis in grape berries.
- Manipulating light exposure presents a potential strategy for modulating grape aroma profiles for specific market needs.
- Further research into grape volatile metabolism under varying light conditions can inform viticultural practices for enhanced grape quality.
Related Concept Videos
01:32UV–Vis Spectroscopy of Conjugated Systems
5.8K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is...
One of the factors influencing λmax is...
5.8K
02:04Regulation of Transpiration by Stomata
26.2K
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
26.2K
01:30UV–Vis Spectrum
3.1K
When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...
3.1K
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
7.7K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for...
7.7K
00:53Extraction: Effects of pH
1.4K
Consider a neutral form of an amine, B, with a partition coefficient, K, in a liquid mixture containing organic and aqueous phases. The pH of the aqueous phase affects the charge on acidic and basic solutes, and the charged form is usually more soluble in the aqueous phase. Suppose the conjugate acid form of the amine is soluble only in the aqueous phase while the base form is soluble in both phases. Then the distribution coefficient, D, can be given as the ratio of amine concentration in the...
1.4K
01:14UV–Vis Spectrometers
4.0K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
4.0K