Impact of high lipid contents on the production of fermentative aromas during white wine fermentation

2021 ◽  
Author(s):  
Charlie Guittin ◽  
Faïza Maçna ◽  
Isabelle Sanchez ◽  
Xavier Poitou ◽  
Jean-Marie Sablayrolles ◽  
...  
Keyword(s):  
White Wine ◽  
Wine Fermentation ◽  
Lipid Contents ◽  
High Lipid

Isolation and Screening of Microalgae with High-lipid Contents in Shanxi Province

2013 ◽  
Vol 31 (4) ◽  
pp. 415 ◽  
Author(s):  
Jian-Jiao BAN ◽  
Jia FENG ◽  
Shu-Lian XIE
Keyword(s):  
Shanxi Province ◽  
Lipid Contents ◽  
High Lipid

scholarly journals Comparison of Lipid and Palmitoleic Acid Induction of Tribonema minus under Heterotrophic and Phototrophic Regimes by Using High-Density Fermented Seeds

2019 ◽  
Vol 20 (18) ◽  
pp. 4356 ◽  
Author(s):  
Wenjun Zhou ◽  
Hui Wang ◽  
Li Zheng ◽  
Wentao Cheng ◽  
Lili Gao ◽  
...  
Keyword(s):  
Palmitoleic Acid ◽  
High Density ◽  
Time Cost ◽  
Promising Candidate ◽  
Heterotrophic Cultivation ◽  
Lipid Contents ◽  
High Lipid ◽  
Acid Accumulation ◽  
Health Products ◽  
Tribonema Minus

Palmitoleic acid, one scarce omega-7 monounsaturated fatty acid, has important applications in the fields of medicine and health products. Tribonema has been considered as a promising candidate for the production of palmitoleic acid due to its high lipid and palmitoleic acid content and remarkable heterotrophic ability. The high-density heterotrophic cultivation of Tribonema minus was conducted in this work, and the highest biomass of 42.9 g L−1 and a relatively low lipid content of 28.7% were observed. To further enhance the lipid and palmitoleic acid accumulation, induction strategies under two regimes of phototrophy and heterotrophy with different conditions were investigated and compared. Results demonstrated encouraging promotions both by heterotrophic and phototrophic ways, and the final lipid contents reached 41.9% and 49.0%, respectively. In consideration of the time cost, however, the induction under heterotrophic conditions was much more advantageous, by which the highest lipid and palmitoleic acid productivities of 1.77 g L−1 d−1 and 924 mg L−1 d−1 were obtained respectively, with the lipid yield on glucose of 0.26 g g−1.

Effects of different lipid contents on growth of earthworms and the products during vermicomposting

2019 ◽  
Vol 37 (9) ◽  
pp. 934-940 ◽  
Author(s):  
Zexuan Wu ◽  
Bangyi Yin ◽  
Xu Song ◽  
Qi Zhao
Keyword(s):  
Lipid Content ◽  
Low Cost ◽  
Nitrifying Bacteria ◽  
Available Phosphorus ◽  
Negative Effects ◽  
Kitchen Waste ◽  
Lipid Contents ◽  
High Lipid ◽  
Carbon Nitrogen Ratio ◽  
Chemical Characters

In China, the production of kitchen waste was more than 97 million tons per year in 2016. The high lipid content of kitchen waste makes it hard to degrade. Vermicomposting is a kind of low-cost biotechnology through the combination of earthworms and microbes, which could be considered in converting kitchen waste to valuable products. However, the effect of the lipid in kitchen waste on earthworms and composting is not known yet. The objective of this study was to analyze the effects of lipid on vermicomposting and to derive the most suitable lipid content in vermicomposting. In our study, kitchen waste with four different lipid contents was prepared: 0% (A), 5% (B), 10% (C) and 15% (D). The earthworm growth and chemical characters of substrates were measured at the interim (14 days) and the end (28 days) of vermicomposting. Our results showed that the high content of lipid had negative effects on growth of earthworms and products in vermicomposting. The kitchen waste with lower lipid content could be better composted by earthworms. The average body weight of the earthworm increased by 9% in treatment A. Total nitrogen, available phosphorus, available potassium and nitrate nitrogen of treatment A with 0% (measured value: 5%) lipid content were significantly higher than those in other treatments. Meanwhile, treatment A had the lowest carbon/nitrogen ratio which might be due to hindrances in the breathing and activities of earthworms. The high content of lipid makes growth of aerobic bacteria such as nitrifying bacteria difficult.

scholarly journals Approaches to limit S-off-flavors during white wine fermentation with specific emphasis on yeast nitrogen nutrition

2019 ◽  
Vol 15 ◽  
pp. 02029
Author(s):  
P. Wegmann-Herr ◽  
S. Ullrich ◽  
D. Durner
Keyword(s):  
Nitrogen Nutrition ◽  
Pantothenic Acid ◽  
White Wine ◽  
Wine Fermentation ◽  
Yeast Cells ◽  
Yeast Viability ◽  
Significant Difference ◽  
Off Flavors ◽  
Negative Effect ◽  
Diammonium Hydrogen

Low molecular weight volatile sulfur compounds are associated with the “reductive” off flavor of wines. The formation of 15 sulfide off-flavor compounds has been monitored with a novel HS-SPME GC-PFPD method and SIDA quantification during white wine fermentation. Since it is known that glutathione (GSH) might buffer nitrogen stress of the yeast but can also lead to an increase of S-off-flavors, the effect of GSH addition was investigated. Fermentations were carried out in triplicate with Riesling musts showing low NOPA concentrations whereby we evaluated the effect of diammonium hydrogen phosphate (DAHP), pantothenic acid, inactive dry yeast based nutrient (IDY) and must oxidation. It could be shown that only the addition of 0.6 g/L IDY increased fermentation speed and completed fermentations. The addition of IDY as well as GSH lead to a significant increase in H2S formation. Total yeast cells were increased by must oxidation thus leading to faster fermentation whereby no significant difference in S-off-flavors could be observed. The addition of GSH did not affect yeast viability but increased significantly the negative effect of IDY addition regardless the S-off-flavor investigated. In all fermentations the use of DAHP reduced significantly S-off-flavor formation and could completely prevent both S-Methyl thioacetate and S-Ethyl thioacetate development. Under nitrogen deficient conditions, GSH can be used in white wine making when combined with DAHP.

scholarly journals Taxonomy and Physiology of Oxyrrhis marina and Oxyrrhis maritima in Korean Waters

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2057
Author(s):  
Min Kyoung Jung ◽  
Tae Yeon Yin ◽  
Seung Joo Moon ◽  
Jaeyeon Park ◽  
Eun Young Yoon
Keyword(s):  
Coastal Waters ◽  
Phylogenetic Trees ◽  
High Salinity ◽  
Ssu Rdna ◽  
Heterotrophic Dinoflagellate ◽  
Korean Waters ◽  
Oxyrrhis Marina ◽  
Lipid Contents ◽  
High Lipid ◽  
Characterization Studies

The genus Oxyrrhis is a heterotrophic dinoflagellate found in diverse marine environments. Oxyrrhis spp. have received attention owing to their ecological and industrial importance, high lipid contents, and docosahexaenoic acid formation. To the best of our knowledge, contrary to O. marina, ecophysiological characterization studies on O. maritima have not yet been reported. Therefore, we investigated the taxonomy and ecophysiology of four strains of O. marina from coastal waters and two strains of O. maritima from the littoral tidepool waters of Korea. Based on phylogenetic trees constructed using internal transcribed spacer ribosomal DNA (ITS rDNA) and SSU rDNA of dinoflagellates, the clade of all four O. marina strains was divergent from that of the two O. maritima strains. We measured the growth rates of both species at various water temperatures (10–36 °C), salinities (5–90), and light intensities (0–100 µE·m−2·s−1). The lowest (O. marina and O. maritima: 10 °C) and highest temperatures (O. marina: <35 °C, O. maritima: >35 °C) revealed that O. maritima has more tolerance to high salinity. This study provides a basis for understanding the ecophysiology of O. marina and O. maritima and their population dynamics in marine ecosystems.

scholarly journals Quantification of fatty acids in salmon fillets conserved by different methods

2017 ◽  
Vol 39 (4) ◽  
pp. 403 ◽  
Author(s):  
Renata Menoci Gonçalves ◽  
Paula Fernandes Montanher ◽  
Fabiana Carbonera ◽  
Maria Eugênia Petenuci ◽  
Roberta Da Silveira ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Saturated Fatty Acids ◽  
Monounsaturated Fatty Acids ◽  
Total Lipids ◽  
Omega 3 ◽  
Long Term Storage ◽  
Lipid Contents ◽  
High Lipid ◽  
Term Storage

 Lipid contents and the composition of fatty acids of fillets from Chilean salmon (Salmo salar) were determined under different conservation methods: fresh salmon, frozen salmon, water-conserved canned salmon and frozen salmon in long-term storage. Fatty acid contents were determined by gas chromatography. The fillets had high lipid levels, ranging between 9.71 and 12.86%. All samples presented high levels of monounsaturated fatty acids, between 363.69 and 425.30 mg g-1 of total lipids, followed by polyunsaturated fatty acids (294.46 - 342.45 mg g-1 of total lipids) and saturated fatty acids (203.32 - 223.17 mg g-1 of total lipids). Although samples revealed different lipid contents, all proved to be great sources of omega-3 fatty acids, regardless of the manner of conservation. 

scholarly journals Photoperiod influence on the biology and phenological characteristics of Dichelops melacanthus (Dallas, 1851) (Heteroptera: Pentatomidae)

2003 ◽  
Vol 63 (4) ◽  
pp. 655-664 ◽  
Author(s):  
V. R. Chocorosqui ◽  
A. R. Panizzi
Keyword(s):  
Mortality Rates ◽  
Developmental Time ◽  
Reproductive Organs ◽  
Lower Percentage ◽  
Stink Bugs ◽  
Long Day ◽  
Lipid Contents ◽  
High Lipid ◽  
Seasonal Dimorphism ◽  
Heteroptera Pentatomidae

The influence of the photoperiod on the biology and seasonal morphs of Dichelops melacanthus (Dallas, 1851) was studied in the laboratory. Four different photoperiods (11, 12, 13, and 14 hL = hours of light) were tested, keeping the temperature at 25 ± 1ºC and the relative humidity at 65 ± 5%. Nymph developmental time tended to be longer under shorter photophases (11 and 12 hL). The 14-hour photophase (long day) resulted in lower nymph mortality rates. Females maintained at 13 and 14 hL showed greater weight gain (1st-28th day) than females under 12 hL. D. melacanthus showed reproductive oligopause induced by short photophases, especially when exposed to 11 hL. Under 13 and 14 hL, 85% and 65% of females oviposited, respectively, in comparison to 10% and 15% of females ovipositing under 11 and 12 hL, respectively. Fecundity (number of egg masses and number of eggs/female) was greater in the longer than under the shorter photophases. Seasonal dimorphism induced by photoperiod was observed in D. melacanthus adults. Under short-day conditions (11 and 12 hL), adults showed short and rounded shoulder spines, grayish brown abdomen (mainly in 11 hL), high lipid contents, and lower percentage of mature reproductive organs. Under long-day conditions (13 and 14 hL), the stink bugs showed greatly developed shoulder spines, green abdomen, low lipid contents, and mature reproductive organs.

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