scholarly journals Amphilectene Diterpene Isonitriles and Formamido Derivatives from the Hainan Nudibranch Phyllidia Coelestis

Marine Drugs ◽  
2019 ◽  
Vol 17 (11) ◽  
pp. 603 ◽  
Author(s):  
Marianna Carbone ◽  
Maria Letizia Ciavatta ◽  
Emiliano Manzo ◽  
Xiao-Lu Li ◽  
Ernesto Mollo ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
South China Sea ◽  
Chemical Defense ◽  
South China ◽  
Generalist Predator ◽  
Nmr Analysis ◽  
Terpene Content ◽  
Structural Architecture ◽  
Dietary Origin

Terpene content of two distinct collections of the nudibranch Phyllidia coelestis from the South China Sea has been chemically analyzed. A series of amphilectene diterpenes, most likely of dietary origin, with isocyano and formamido functionalities have been isolated from both collections and spectroscopically characterized by an exhaustive nuclear magnetic resonance (NMR) analysis. Interestingly, the structural architecture of compounds 5–7 and 9 with both 8,13-cis and 12,13-cis ring junctions is unprecedented in the amphilectene skeleton. Metabolite 3, which was the most abundant in the nudibranch’s mantle, has been shown to deter feeding by a generalist predator, supporting its involvement in chemical defense.

A Novel Compound Enniatin G from the Mangrove Fungus Halosarpheia sp. (strain #732) from the South China Sea

2002 ◽  
Vol 55 (3) ◽  
pp. 225 ◽  
Author(s):  
Y. Lin ◽  
J. Wang ◽  
X. Wu ◽  
S. Zhou ◽  
L. L. P. Vrijmoed ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
South China Sea ◽  
South China ◽  
Spectroscopic Data ◽  
The South China Sea ◽  
Two Dimensional ◽  
The South ◽  
China Sea ◽  
Cyclic Depsipeptide

A novel cyclic depsipeptide, enniatin G, together with enniatins B and B4 were isolated from the mangrove fungus Halosarpheia sp.(strain 732) from the South China Sea. Their structures were determined by analysis of spectroscopic data, mainly two-dimensional nuclear magnetic resonance experiments. Enniatin G exhibited activity against Heps 7402, ED50 12mg/mL.

scholarly journals A Meroterpenoid Isolated From the Fungus Aspergillus sp.

2019 ◽  
Vol 14 (11) ◽  
pp. 1934578X1987893 ◽  
Author(s):  
Yingying Hu ◽  
Meng Yang ◽  
Jun Zhao ◽  
Zhixin Liao ◽  
Jun Qi ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Antibacterial Activity ◽  
Magnetic Resonance ◽  
South China Sea ◽  
South China ◽  
X Ray ◽  
Aspergillus Sp ◽  
Weak Antibacterial Activity ◽  
Absolute Stereochemistry ◽  
Cucumaria Japonica

A meroterpenoid, chevalone B, was obtained from the Cucumaria japonica-derived fungus Aspergillus sp. H30, which was collected from the South China Sea. The structure was determined by the analysis of nuclear magnetic resonance (NMR) spectroscopic and X-ray data. This is the first report of the crystallographic data and absolute stereochemistry of chevalone B, which was shown to have weak antibacterial activity.

Lactose quantification in bovine milk by nuclear magnetic resonance without deuterated solvent (No-D qNMR)

2020 ◽  
Vol 12 (40) ◽  
pp. 4892-4898
Author(s):  
Danyelle Alves da Cunha ◽  
Thays Cardoso Valim ◽  
Paulo Roberto Filgueiras ◽  
Valdemar Lacerda Junior ◽  
Alvaro Cunha Neto
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Bovine Milk ◽  
Nmr Analysis ◽  
H Nmr ◽  
Nuclear Magnetic

Validation of a method to quantify low lactose content in commercial lactose-free milk by 1H NMR analysis.

scholarly journals Rapid Determination ofMoisture/Solids and Fat in Dairy Products by Microwave and Nuclear Magnetic Resonance Analysis: PVM 1:2004

2005 ◽  
Vol 88 (1) ◽  
pp. 107-120 ◽  
Author(s):  
Gary Cartwright ◽  
Bobbie H McManus ◽  
Timothy P Leffler ◽  
Cindy R Moser
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Dairy Products ◽  
Rapid Determination ◽  
Microwave Drying ◽  
Nuclear Magnetic Resonance Analysis ◽  
Nmr Analysis ◽  
Plant Operations ◽  
Solids Content ◽  
Nuclear Magnetic

Abstract A peer-verified method is presented for the determination of percent moisture/solids and fat in dairy products by microwave drying and nuclear magnetic resonance (NMR) analysis. The method involves determining the moisture/solids content of dairy samples bymicrowave drying and using the dried sample to determine the fat content by NMR analysis. Both the submitting and peer laboratories analyzed various dairy products by using a CEM SMART system (moisture) and the SMART Trac (fat). The samples included milks, creams, ice cream mix, sour cream, yogurt, cream cheese, and mozzarella, Swiss, and cheddar cheeses. These samples represented a range of products that processors deal with in daily plant operations. The results were compared with moisture/solids and fat values derived from AOAC-approved methods.

scholarly journals Dibromotyrosine and Histamine Derivatives from the Tropical Marine Sponge Aplysina sp

2010 ◽  
Vol 5 (3) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Elena A. Santalova ◽  
Vladimir A. Denisenko ◽  
Valentin A. Stonik
Keyword(s):  
South China Sea ◽  
Chemical Defense ◽  
South China ◽  
Marine Sponge ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
New Compounds ◽  
C Nmr

Two new compounds, 3-amino-7,8-dihydroimidazo-[1,5-c]-pyrimidin-5(6H)-one (1) and ethyl 3-(2-amino-1H-imidazol-4-yl)propylcarbamate (2), along with the previously known 7,8-dihydroimidazo-[1,5-c]-pyrimidin-5(6H)-one (3), aeroplysinin-1 (4), dibromoverongiaquinol (5), bisoxazolidinone derivative (6), aerophobins-1 (7) and −2 (8), purealidins J (9) and L, have been isolated from Aplysina sp. from the South China Sea. The structures were elucidated on the basis of 1H, 13C NMR, MS and IR analyses. The histamine-derived alkaloids 1-3 may be unknown bioconversion products of purealidin J (9), aerophobin-2 (8) and aerophobin-1 (7), respectively, when 7-9 are cleaved at C-8–C-9 in reactions of activated chemical defense in Aplysina sponge.

Metabolism of D-[1-13C]glucose in livers of Meriones unguiculatus infected with Echinococcus multilocularis

1995 ◽  
Vol 73 (1) ◽  
pp. 58-66 ◽  
Author(s):  
Marie Novak ◽  
Ashok Modha ◽  
Jonathan Lee ◽  
Richard Buist ◽  
Barry Blackburn
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Quantitative Evaluation ◽  
Perchloric Acid ◽  
Echinococcus Multilocularis ◽  
Glycogen Synthesis ◽  
Meriones Unguiculatus ◽  
Nmr Analysis ◽  
In Situ Spectra

Following administration of [1-13C]glucose, sequential 13C nuclear magnetic resonance (NMR) in situ spectra were obtained from the liver of uninfected jirds (Meriones unguiculatus) and those infected with Echinococcus multilocularis over a period of 2 h. Quantitative evaluation of the flow of labelled carbon through the liver at 80 and 120 min after glucose administration revealed that although the percentage of labelled glucose utilized by the liver was the same for both groups, glycogen synthesis differed. At both times, the livers of infected animals had incorporated a smaller percentage of the [1-13C]glucose into glycogen labelled at C1 and a larger percentage into the C6 position of glucose/glycogen. In another experiment, identical with respect to the substrate administered, NMR analysis of perchloric acid extracts revealed that the livers of infected animals had lower concentrations of labelled glucose and glycogen and higher concentrations of labelled alanine and lactate than those of uninfected controls. Concentration differences were also noted for some of the unlabelled metabolites. Echinococcus multilocularis cysts contained the same labelled metabolites as the livers but the concentration of lactate was much higher. Parasite cysts also contained labelled acetate.

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