scholarly journals Saaz Special – another hop variety recommended for Czech beer

2021 ◽  
Vol 67 (1) ◽  
pp. 409-416
Author(s):  
Alexandr Mikyška ◽  
Karel Štěrba ◽  
Martin Slabý ◽  
Marie Jurková ◽  
Aleš Kopecký ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Essential Oils ◽  
Geographical Indication ◽  
Beer Brewing ◽  
Special Variety ◽  
Sensory Impression ◽  
Sensory Profiles

The specification of varietal profiles of secondary metabolites of hops in beer is rather important for hop growing and beer brewing. Chemical and sensory profiles of beers hopped with the varieties of Saaz Special and the traditional Saaz semiearly red bine hops (Saaz) were compared in three-year pilot brews (200 L). Single kettle hopped beers and single kettle + dry hopped beers were prepared. The overall sensory impression of the Saaz Special beers was comparable to Saaz hops. The profile of essential oils and hop aromas/flavours in the beer was partially different, but the hop aroma did not receive a worse rating than Saaz. The Saaz Special dry hopped beers were clearly distinguished from Saaz in triangle tests, but no preference was given to either variety. Based on the achieved results, the Saaz Special variety was listed among varieties recommended for the production of the beer with the Protected Geographical Indication of Czech Beer thanks to the achieved results.

scholarly journals Brewing tests of new fine aroma hop varieties (Humulus lupulus L.) Saaz Brilliant, Saaz Comfort and Saaz Shine

2021 ◽  
Vol 67 (4) ◽  
pp. 464-473
Author(s):  
Alexandr Mikyška ◽  
Karel Štěrba ◽  
Martin Slabý ◽  
Vladimír Nesvadba ◽  
Jitka Charvátová
Keyword(s):  
Essential Oils ◽  
Control Sample ◽  
Sensory Profile ◽  
Humulus Lupulus L ◽  
New Varieties ◽  
Sensory Impression ◽  
Sensory Profiles ◽  
The Impact

Characterization of varietal profiles of hop secondary metabolites in beer is of considerable importance for hop growing and brewing. This three-year study focused on pilot brewing tests of three new Saaz derived hop varieties, namely Saaz Brilliant, Saaz Shine and Saaz Comfort. The sensory profiles of kettle and kettle+dry single hopped beers were monitored. At the same time, the impact of dry hopping technology on sensory perception of final beers and changes in volatile compounds was investigated. Pilot brews (200 l) of 12% pale lager were prepared in kettle and kettle+dry variants using the new Czech varieties and traditional Saaz as a control sample. Essential oils in beers were determined by GC/MS-MS method with the aim to clarify links to the beer sensory profile of both, kettle and dry hopping mode. The descriptive sensory method of hop-derived aromas and the triangle tests were employed to determine the sensory quality of beer. The overall sensory impression of beers from all tested varieties was at least comparable to traditional Saaz, and Saaz Comfort even reached better evaluation. The profile of essential oils and hop flavours in beer was partially different, however it was not rated worse than Saaz. The kettle+dry hopped beers of new varieties were significantly different from Saaz in the triangle test, Saaz Brilliant was preferred over the Saaz. The results showed considerable potential of new varieties for the production of interesting and taste-specific beers and the enrichment of the spectrum of fine aroma varieties of Czech hops.

scholarly journals Antimicrobial Activities in Pistacia atlantica—Aphids Make a Difference!

Proceedings ◽  
2020 ◽  
Vol 66 (1) ◽  
pp. 9
Author(s):  
Yoram Gerchman
Keyword(s):  
Secondary Metabolites ◽  
Essential Oils ◽  
Organic Solvents ◽  
Antimicrobial Properties ◽  
Antimicrobial Activities ◽  
Disk Diffusion ◽  
Pistacia Atlantica ◽  
Disk Diffusion Assay ◽  
Bacteria And Fungi ◽  
Diffusion Assay

Plants have been explored and used as sources for antimicrobial extract and compounds for many years, but galls—specialized structures forms on such by diversity of organisms—have been explored much less. Aphid galls host many insects in closed, humid and sugar rich environments for long periods. We have tested the antimicrobial properties of Slavum wertheimae aphid galls on Pistacia atlantica. Secondary metabolites were extracted from leaves and galls with organic solvents, and essential oils with Clevenger, and tested by disk diffusion assay and volatile effect on bacteria and fungi, respectively. The results demonstrated that gall extracts/essential oils had much stronger activity against the diversity of bacteria and fungi. The large diversity of galls suggest they could be explored as source for novel compounds.

scholarly journals Pharmacology and Phytochemistry of Ecuadorian Medicinal Plants: An Update and Perspectives

2021 ◽  
Vol 14 (11) ◽  
pp. 1145
Author(s):  
Chabaco Armijos ◽  
Jorge Ramírez ◽  
Melissa Salinas ◽  
Giovanni Vidari ◽  
Alírica I. Suárez
Keyword(s):  
Chemical Composition ◽  
Medicinal Plants ◽  
Secondary Metabolites ◽  
Essential Oils ◽  
Volatile Compounds ◽  
Biological Activities ◽  
Indigenous Communities ◽  
Therapeutic Agents ◽  
Practical Applications ◽  
Pharmacological Studies

The use of plants as therapeutic agents is part of the traditional medicine that is practiced by many indigenous communities in Ecuador. The aim of this study was to update a review published in 2016 by including the studies that were carried out in the period 2016–July 2021 on about 120 Ecuadorian medicinal plants. Relevant data on raw extracts and isolated secondary metabolites were retrieved from different databases, resulting in 104 references. They included phytochemical and pharmacological studies on several non-volatile compounds, as well as the chemical composition of essential oils (EOs). The tested biological activities are also reported. The potential of Ecuadorian plants as sources of products for practical applications in different fields, as well the perspectives of future investigations, are discussed in the last part of the review.

scholarly journals Volatilome and Essential Oil of Ulomoides dermestoides: A Broad-Spectrum Medical Insect

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6311
Author(s):  
Paulina J. Cázares-Samaniego ◽  
Claudia G. Castillo ◽  
Miguel A. Ramos-López ◽  
Marco M. González-Chávez
Keyword(s):  
Secondary Metabolites ◽  
Essential Oil ◽  
Essential Oils ◽  
Traditional Medicine ◽  
Broad Spectrum ◽  
Alternative Treatment ◽  
Aromatic Compounds ◽  
Therapeutic Potential ◽  
Pharmacological Interest ◽  
Main Components

Ulomoides dermestoides are used as a broad-spectrum medical insect in the alternative treatment of various diseases. Preliminary volatilome studies carried out to date have shown, as the main components, methyl-1,4-benzoquinone, ethyl-1,4-benzoquinone, 1-tridecene, 1-pentadecene, and limonene. This work focused on the production of metabolites and their metabolic variations in U. dermestoides under stress conditions to provide additional valuable information to help better understand the broad-spectrum medical uses. To this end, VOCs were characterized by HS-SPME with PEG and CAR/PDMS fibers, and the first reported insect essential oils were obtained. In HS-SMPE, we found 17 terpenes, six quinones, five alkenes, and four aromatic compounds; in the essential oils, 53 terpenes, 54 carboxylic acids and derivatives, three alkynes, 12 alkenes (1-Pentadecene, EOT1: 77.6% and EOT2: 57.9%), 28 alkanes, nine alkyl disulfides, three aromatic compounds, 19 alcohols, three quinones, and 12 aldehydes were identified. Between both study approaches, a total of 171 secondary metabolites were identified with no previous report for U. dermestoides. A considerable number of the identified metabolites showed previous studies of the activity of pharmacological interest. Therefore, considering the wide variety of activities reported for these metabolites, this work allows a broader vision of the therapeutic potential of U. dermestoides in traditional medicine.

scholarly journals Characterization of secondary metabolites of leaf and stem essential oils of Achillea fragrantissima from central region of Saudi Arabia

2020 ◽  
Vol 13 (5) ◽  
pp. 5254-5261 ◽  
Author(s):  
Merajuddin Khan ◽  
Mujeeb Khan ◽  
Mahmood M.S. Abdullah ◽  
Lamya H. Al-Wahaibi ◽  
Hamad Z. Alkhathlan
Keyword(s):  
Saudi Arabia ◽  
Secondary Metabolites ◽  
Essential Oils ◽  
Central Region ◽  
Achillea Fragrantissima

The Expression of Distinctive Secondary Metabolites by Different Eucalyptus spp

1992 ◽  
Vol 45 (11) ◽  
pp. 1919
Author(s):  
RM Carman
Keyword(s):  
Secondary Metabolites ◽  
Essential Oils ◽  
Secondary Metabolite ◽  
Eucalyptus Species ◽  
Metabolite Level

A survey of the essential oils of various Eucalyptus species shows that there are sufficient compounds present to support the expectation that differences between species will be expressed or accompanied at the secondary metabolite level by different chemicals, rather than by a different mix of similar chemicals.

scholarly journals Unani Perspective and New Researches of Sa’ad ku’fi (Cyperus rotundus): A Review

2018 ◽  
Vol 8 (6) ◽  
pp. 378-381
Author(s):  
Hana Abbasi ◽  
Hifzul Kabir
Keyword(s):  
Amino Acids ◽  
Secondary Metabolites ◽  
Medicinal Plant ◽  
Essential Oils ◽  
Chemical Constituents ◽  
Cyperus Rotundus ◽  
Nootropic Agent ◽  
Major Chemical ◽  
Important Medicinal Plant ◽  
Different Parts

Cyperus rotundus L. (cyperaceae) is an important medicinal plant which is used in traditional medicine particularly in Unani system of medicine. It is commonly known as motha which is a lawn grass and grows easily in tropical, subtropical and temperate regions. Major Chemical constituents enclosed with this herb are flavonoids, tannins, glycosides, furochromones, monoterpenes, sesquiterpenes, sitosterol, alkaloids, saponins, terpenoids, essential oils, starch, carbohydrates, protein, separated amino acids and many other secondary metabolites. Different parts of cyperus rotundus have been reported to possess multiple pharmacological actions like antibacterial, anticancerous, anticonvulsant, antidiabetic, antidiarrheal, antigenotoxic, anti-inflammatory, antilipidemic, antimalarial, antimutagenic, antiobesity, antioxidant, anti-uropathogenic, hepatoprotective, cardioprotective, neuroprotective, and nootropic agent. Keywords: Unani, sa’ad, flavonoids, sesquiterpenes, antibacterial, antilipidemic.

scholarly journals Essential oil from Piperaceae as a potential for biopesticide agents: a review

Food Research ◽  
2020 ◽  
Vol 4 (S5) ◽  
pp. 1-10
Author(s):  
N.A. Abdullah ◽  
W.Z.W.M. Zain ◽  
H.A. Hamid ◽  
N.W. Ramli
Keyword(s):  
Secondary Metabolites ◽  
Essential Oils ◽  
Biological Activities ◽  
The United States ◽  
Antimicrobial Activities ◽  
Biological Properties ◽  
Present Information ◽  
United States Food ◽  
Synthetic Pesticide ◽  
States Food

This review is aimed to present information on the properties of Piperaceae which can be potentially used as a biopesticide. The chemical compounds involved in were different as each species consist of different amount of secondary metabolites which then leads to different properties. In recent years, several reports have been published regarding the composition and the biological activities of the essential oils of Piper species. These studies have highlighted the existence of marked chemical differences among oils extracted from different species or varieties. Analysis of volatile constituents from Piperaceae species has revealed the presence of monoterpenes, sesquiterpenes and arylpropanoids that have shown interesting biological properties including cytotoxic, fungistatic, insecticide, molluscicidal, antioxidant and antimicrobial activities. Essential oils are natural complex secondary metabolites characterized by strong odour, volatility and have generally lower density than water. Due to their volatility, essential oils are environmentally non-persistent. On top of that, essential oils are ‘generally recognized as safe’ by the United States Food and Drug Administration (FDA). Since technology has become more advanced, people started to replace synthetic pesticide with bio-pesticide. The demand for EO has increased as it has biological properties that can be used to replace synthetic pesticide

scholarly journals A Preliminary Screening of the Different of Secondary Metabolites Ruku-Ruku Leaves (Ocimum tenuiflorum Linnen) in West Sumatera

2019 ◽  
Vol 20 (2) ◽  
pp. 17-24
Author(s):  
Hesty Parbuntari ◽  
Sri Benti Etika ◽  
Melindra Mulia ◽  
Elfanny Delvia
Keyword(s):  
Secondary Metabolites ◽  
Medicinal Plant ◽  
Essential Oils ◽  
Bioactive Compounds ◽  
Light Exposure ◽  
Phytochemical Screening ◽  
Preliminary Screening ◽  
West Sumatra ◽  
Ocimum Tenuiflorum ◽  
Qualitative Test

Ruku-ruku leaves are used to remove distinctive odors from fish in some cuisine of West Sumatra. The characteristic odor comes from secondary metabolites especially essential oils. Therefore, secondary metabolites in ruku-ruku leaves have the potential to be further investigated as a source of bioactive compounds. The phytochemical screening of ruku-ruku leaves is a preminilary qualitative test that needs to be done to maximise its function as a medicinal plant. Based on the result data, there are some different result of flavonoid, steroids, and triterpenoids identification. Ruku-ruku leaves from Pesisir Selatan and Padang Panjang shows less flavonoid compounds tham Payakumbuh, Batusangkar, and Lubuk Alung. Both of this city and Payakumbuh also gives less steroids and triterpenoids. The factor influencing this result is caused by several factors, namely temperature, humidity, light exposure, and salinity.

Sign in / Sign up

Export Citation Format

Share Document