Study of agricultural by-products. Extractability and amino acid composition of grapeseed (Vitis vinifera) proteins

Adopting cover crops for vineyard soil management can provide several benefits, including soil protection, reductions in vine vigor, and enhancements in berry composition. However, the effects of this practice on wine aroma have seldom been addressed. This study aimed to determine the influence of different cover crops and soil tillage on the must and wine amino acid composition and wine volatile compounds of the red cultivar, ‘Mencía’ (Vitis vinifera L.), grown in Northwest Spain. Treatments consisted of soil tillage (ST), native vegetation (NV), English ryegrass (ER), and subterranean clover (SC). Cover crops did not alter the macro-constituents of musts; however, musts from NV and SC tended to lower concentrations of amino acids. Some color attributes of wines were influenced by cover crops in the vineyard. Methanol and trans-linalool oxide (pyran) concentrations in wines were significantly affected by soil management. Professional tasters encountered differences in visual, aroma, and palate descriptors of wines depending on the treatment imposed in the vineyard. These alterations in sensory properties seemed to obey to slight modifications of wine chemical characteristics due to vineyard soil management. According to these results, cover crops might be useful for modulating wine aroma in humid climates.

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Amino Acid Composition of Grape (Vitis vinifera L.) Juice in Response to Applications of Urea to the Soil or Foliage

American Journal of Enology and Viticulture ◽

10.5344/ajev.2015.15015 ◽

2015 ◽

Vol 67 (1) ◽

pp. 47-55 ◽

Cited By ~ 19

Author(s):

K. D. Hannam ◽

G. H. Neilsen ◽

D. Neilsen ◽

A. J. Midwood ◽

P. Millard ◽

...

Keyword(s):

Amino Acid ◽

Vitis Vinifera ◽

Amino Acid Composition ◽

Acid Composition ◽

Vitis Vinifera L

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Assessment of Halamphora coffeaeformis Growth and Biochemical Composition for Aquaculture Purposes

Journal of Marine Science and Engineering ◽

10.3390/jmse8040282 ◽

2020 ◽

Vol 8 (4) ◽

pp. 282 ◽

Cited By ~ 2

Author(s):

Paola G. Scodelaro Bilbao ◽

Lucas A. Martín ◽

Cecilia A. Popovich ◽

María Delfina Almeyda ◽

Verónica Chamorro ◽

...

Keyword(s):

Fatty Acid ◽

Amino Acid ◽

Amino Acid Composition ◽

Acid Composition ◽

Fish Farming ◽

Fatty Acid Analysis ◽

Exponential Growth Phase ◽

Suitable Amount ◽

Alternative Sources ◽

By Products

The vast majority of the world’s fishery by-products are utilized in the fish farming industry. However, due to the high cost and unsustainability of these by-products, alternative sources must be found. Marine diatoms produce important amounts of fatty acids, sterols, proteins and carbohydrates. In this work, we assessed the nutritional value of Halamphora coffeaeformis at the exponential growth phase, to determine its suitability for aquafeed. The strain was grown in a photobioreactor at 20 °C for 6 days. The production of proteins, lipids and carbohydrates was determined, and essential fatty acid, sterol and amino acid composition was assessed. The highest values of triacylglycerides (TAG), free and esterified sterols, proteins and carbohydrates were found after 6 days of growth in the photobioreactor. Fatty acid analysis by gas chromatography showed the presence of eicosapentaenoic (EPA) and arachidonic (ARA) in amounts similar to those for fish oils. In terms of sterols, a predominance of stigmasterol was observed, followed by cholesterol. The amino acid composition revealed 50% of them to be among those essential for fish and other aquatic animals. Finally, a suitable amount of carbohydrates was found in H. coffeaeformis cultures. Together, these findings support the use of H. coffeaeformis as an alternative and sustainable source for aquafeed to partially replace the use of fishery by-products.

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