An Improved Analytical Procedure for the Determination of Xanthophyll

1967 ◽  
Vol 50 (3) ◽  
pp. 707-711
Author(s):  
G O Kohler ◽  
R E Knowles ◽  
A L Livingston
Keyword(s):  
Plant Material ◽  
Analytical Procedure ◽  
Fresh Plant ◽  
Fresh Plant Material ◽  
Cold Saponification

Abstract A modified procedure is described for the determination of carotene and xanthophyll in fresh and dehydrated alfalfa and grass meal. In this method, both carotene and total xanthophyll can be measured from a single extract. The carotenoids in dehydrated alfalfa or grass meal are extracted by overnight soaking in hexane-acetone (7:3) ; those in the fresh plant material are rapidly extracted by blending with acetone. A cold saponification method eliminates possible chlorophyll contamination of the xanthophyll fraction during chromatography. Data on the precision of the modified methods are presented

The determination of oxalates in fresh plant material

The Analyst ◽  
1952 ◽  
Vol 77 (916) ◽  
pp. 340 ◽  
Author(s):  
C. J. L. Baker
Keyword(s):  
Plant Material ◽  
Fresh Plant ◽  
Fresh Plant Material

The chemical composition of native organic matter influences the response of bacterial community to input of biochar and fresh plant material

2015 ◽  
Vol 395 (1-2) ◽  
pp. 87-104 ◽  
Author(s):  
Congying Wang ◽  
Craig Anderson ◽  
Manuel Suárez-Abelenda ◽  
Tao Wang ◽  
Marta Camps-Arbestain ◽  
...  
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Bacterial Community ◽  
Plant Material ◽  
Fresh Plant ◽  
Fresh Plant Material ◽  
Native Organic Matter

scholarly journals Aroma Compounds of Mountain Tea (Sideritis scardica and S. raeseri) from Western Balkan

2014 ◽  
Vol 9 (9) ◽  
pp. 1934578X1400900 ◽  
Author(s):  
Bujar Qazimi ◽  
Gjoshe Stefkov ◽  
Marija Karapandzova ◽  
Ivana Cvetkovikj ◽  
Svetlana Kulevanova
Keyword(s):  
Gas Chromatography ◽  
Plant Material ◽  
Aroma Compounds ◽  
Qualitative Composition ◽  
Aerial Parts ◽  
Fresh Plant ◽  
Fresh Plant Material ◽  
Chemical Profiles ◽  
Volatile Aroma ◽  
Aroma Components

The composition of the volatile aroma components was defined in the dried and fresh aerial parts of Sideritis scardica Griseb. from R. Macedonia and S. raeseri Boiss. & Heldr. from R. Macedonia, Albania and Greece. Analysis was made by gas chromatography (GC/FID/MS) equipped with a headspace (HS) sampler. Thirty-two components (15 monoterpenes representing 33.2–62.8% and 17 sesquiterpenes representing 25.2–51.2% of the entire volatiles) were identified as aroma components of dried plant material of S. scardica. Thirty components {14 monoterpenes (19.3–74.2%), 2 alcohols (6.2–38.4%) and 14 sesquiterpenes (18.2–33.5%)} were identified as aroma components in the fresh aerial parts of S. scardica. The predominant components were trans-caryophyllene, β-pinene, α-pinene and 1-octen-3-ol, which were found only in the fresh samples. In the aerial parts of S. raeseri, 43 components were identified in the dried samples {22 monoterpenes (65.7–94.3%) and 21 sesquiterpenes (5.4–27.8%)} and 29 components {15 monoterpenes (77.3–90.7%) and 14 sesquiterpenes (6.3–18.2%)} in the respective fresh samples. Prevailing components in all tested samples of S. raeseri were β-pinene, α-pinene, α-copaene, sabinene and limonene. Only minor differences were revealed in the qualitative composition of the aroma volatiles between the dried and fresh plant material of both species. Furthermore there was almost no difference in the chemical profiles of the aroma compounds between S. scardica and S. raeseri, except for 1-octen-3-ol, which was present only in fresh S. scardica.

scholarly journals Results of competitive variety trials of promising cultivar of Melissa officinalis L. subsp. Altissima (Smith.) Arcang.

2020 ◽  
Author(s):  
N.V. Nevkrytaya ◽  
◽  
I.A. Novikov ◽  
Keyword(s):  
Essential Oil ◽  
Plant Material ◽  
Raw Materials ◽  
Melissa Officinalis ◽  
Variety Trials ◽  
Variety Trial ◽  
Fresh Plant ◽  
Fresh Plant Material ◽  
Germacrene D

In 2017–2019, a competitive variety trial of promising cultivar MD 1-17 of Melissa officinalis L. subsp. Altissima (Smith.) Arcang was conducted. We compared it with M. officinalis L. subsp. Officinalis varieties ‘Krymchanka’ and ‘Lada’. Сultivar MD 1-17 significantly exceeds other varieties in terms of yield of fresh plant material (on average, by 77.4 and 62.2 %, respectively). It also surpasses variety ‘Krymchanka’ (the best in collecting essential oil from air-dried raw materials) by 57.1 %. Basic components presented in the essential oil of M. officinalis L. subsp. Altissima (Smith.) Arcang. cv. MD 1-17. Promising cultivar are caryophyllene (25.3–35.9 %) and germacrene D (17.7–31.2 %). Citral is almost completely absent or present in an insignificant amount (0.1–7.3 %); its proportion in the essential oil of varieties ‘Krymchanka’ and ‘Lada’ can reach 36.6 %.

The δ13C value of ruminant saliva and its effect on the estimation of the legume component of oesophageal extrusa samples

1989 ◽  
Vol 113 (2) ◽  
pp. 199-202 ◽  
Author(s):  
R. J. Jones ◽  
R. P. Lefeuvre
Keyword(s):  
Plant Material ◽  
Negative Bias ◽  
Positive Shift ◽  
Significant Bias ◽  
Fresh Plant ◽  
Fresh Plant Material ◽  
Δ13c Value ◽  
The Difference ◽  
Plant Components

SUMMARYThe C3 and C4 plant components in extrusa samples from oesophageally fistulated cattle can be estimated by δ13Canalysis. However, contamination with saliva containing bicarbonates could cause bias in the estimation of the C3 or C4 components. Saliva from animals fed C4 and C3 diets had δ13C values of – 4.37/103 and –15.97/103, respectively. Both values showed a large positive shift of c. 10 units relative to the diets, but the difference between feeds was maintained in the saliva. On theoretical grounds, contamination of the ingested feed with saliva should have caused a small (1·3–3·4% legume) negative bias when estimating legume percentage in the diet. This did not occur when saliva of known (PC was added to mixtures of C3 and C4 forages which were dried, ground and analysed for δ13C. It is postulated that CO2 was lost from bicarbonate when saliva was dried in contact with fresh plant material, and so no significant bias was detected. It would appear that the δ13C technique can be used to estimate the proportion of C3 and C4 components in oesophageal extrusa samples without significant bias from salivary contamination.

scholarly journals Experimental determination of poplar (Populus nigra L.) wood drying curves 

2017 ◽  
Vol 63 (Special Issue) ◽  
pp. S53-S58
Author(s):  
Souček Jiří ◽  
Kroulík Milan
Keyword(s):  
Plant Material ◽  
Relative Rate ◽  
Populus Nigra ◽  
Wood Drying ◽  
Important Indicator ◽  
Fresh Plant Material ◽  
Drying Curves ◽  
Drying Conditions ◽  
Drying Efficiency

Fresh plant material is degraded quickly and very easily. A possibility to avoid its degradation is drying. Drying is an energy-intensive operation and reducing of energy consumption means improving the energy balance and the economy of production. An important indicator of drying efficiency is the relative rate of drying. Curves of the relative drying rate for poplar (Populus nigra L.) wood were determined in an experimental oven. Freshly harvested samples were compared to samples of poplars that were stored between March and December on an outdoor uncovered area. The rate of stored wood drying was higher in comparison with fresh wood under comparable drying conditions. 

scholarly journals Drying Potential of Leaves Oil of Zanthoxylum armatum DC from North India

2021 ◽  
Vol 9 (1) ◽  
pp. 9-14
Author(s):  
Lata Rana ◽  
Ankita Rai ◽  
Lalit M. Tewari ◽  
Neha Chopra ◽  
Naveen C. Pandey ◽  
...  
Keyword(s):  
Plant Material ◽  
Social Acceptance ◽  
Essential Oil Composition ◽  
North India ◽  
Oil Composition ◽  
Active Components ◽  
Plant Materials ◽  
Zanthoxylum Armatum ◽  
Fresh Plant ◽  
Fresh Plant Material

Background: The study on drying and its social acceptance has increased rapidly. Among different drying techniques, shade drying is one of the most feasible methods to keep intact from the decay of the main active components of the plant materials. Shade drying is an ancient drying method that increases durability, major constituents and activity of the plant material. Aims: Research was conducted to examine the drying potential of aromatic leaves oil of Zanthoxylum armatum DC. Methods: The fresh plant material was collected from Lohaghat, Champawat district of Uttarakhand and hydrodistilled before and after shade drying to assess the changes in the quality of volatile constituents by GC and GC-MS techniques. A two-tailed paired t-test was executed to assess the difference between drying treatments using MS-Excel. Results: The major components in the fresh oil were 2-undecane, linalool, (E)-β-ocimene, α-pinene and β-phellandrene. In the oil from dried material, the three predominant compounds were noted. A significant increase was observed in the percentage of β-phellandrene, undecanal and myrcene after shade drying (p<0.01). Five components absent in the fresh plant material appeared and one disappeared during the drying process. Conclusion: Shade drying significantly influenced the essential oil composition of Z. armatum.

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