scholarly journals Storage time dependent photodissociation action spectroscopy of polycyclic aromatic hydrocarbon cations in the cryogenic electrostatic storage ring DESIREE

2019 ◽  
Vol 217 ◽  
pp. 126-137 ◽  
Author(s):  
Mark H. Stockett ◽  
Mikael Björkhage ◽  
Henrik Cederquist ◽  
Henning T. Schmidt ◽  
Henning Zettergren
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Cooling Rate ◽  
Storage Time ◽  
Time Dependent ◽  
Radiative Cooling ◽  
Absorption Profile ◽  
Intrinsic Absorption ◽  
Polycyclic Aromatic ◽  
Electrostatic Storage Ring

The intrinsic absorption profile and radiative cooling rate of coronene cations are reported.

Intrinsic absorption profile and radiative cooling rate of a PAH cation revealed by action spectroscopy in the cryogenic electrostatic storage ring DESIREE

2019 ◽  
Vol 15 (S350) ◽  
pp. 127-131
Author(s):  
Mark H. Stockett ◽  
Mikael Björkhage ◽  
Henrik Cederquist ◽  
Henning T. Schmidt ◽  
Zettergren Henning
Keyword(s):  
Cooling Rate ◽  
Storage Ring ◽  
Storage Time ◽  
Action Spectrum ◽  
Cascade Model ◽  
Radiative Cooling ◽  
Absorption Profile ◽  
Intrinsic Absorption ◽  
Hot Band ◽  
Electrostatic Storage Ring

AbstractThe multi-photon photodissociation (MPD) action spectrum of the coronene cation $$({{\rm{C}}_{24}}{\rm{H}}_{12}^ + )$$ has been measured as a function of storage time up to 60 s in the cryogenic electrostatic storage ring DESIREE. These measurements reveal not only the intrinsic absorption profile of isolated coronene cations, but also the rate at which hot-band absorptions are quenched by radiative cooling. The cooling rate is interpreted using a Simple Harmonic Cascade model of infrared vibrational emission.

scholarly journals ANALISIS MUTU KERANG DARAH (Anadara granosa) ASAP YANG DIKEMAS VAKUM DAN NON VAKUM PADA PENYIMPANAN SUHU RUANG

2020 ◽  
Vol 3 (1) ◽  
pp. 104
Author(s):  
Yoni Yoni ◽  
Kobajashi Togo Isamu ◽  
Sri Rejeki
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Storage Time ◽  
Vacuum Packaging ◽  
Duncan Multiple Range Test ◽  
A Value ◽  
Polycyclic Aromatic ◽  
Anadara Granosa ◽  
Range Test ◽  
Packaging Technique

Quality Analysis of Smoked Cockle Shells (Anadara granosa) with vacuum and nonvacuum packaging techniques in room temperatureABSTRACT         This study aims to determine the effect of packaging factors and storage time on organoleptic values, total bacterial counts and chemical analysis of smoked cockle shells. The characteristics tested were sensory, water content, total bacterial count (TPC) and the value of the PAH compound (Polycyclic Aromatic Hydrocarbon) smoked cockle shells. This study uses a Completely Randomized Design (CRD) consisting of 6 treatments V1L1 (vacuum packaging technique, 2 days storage time), V2L1 (nonvacuum packaging technique, 2 days storage time), V1L2 (vacuum packaging technique, length of storage time 4 days), V2L2 (non-vacuum packaging technique, 4 days storage time), V1L3 (vacuum packaging technique, 6 days storage time), V2L3 (non-vacuum packaging technique, 6 days storage time) and replications three times. Data from observations were analyzed using ANOVA (Analysis of Variance) at a level of 95%, if there is a significant difference (P> 0.05) then a further test was performed with a DMRT (Duncan Multiple Range Test) tests at a 95% significance level. The results obtained showed that the packaging technique and the storage time of smoked cockle shells had a very significant effect on the sensory value which included appearance, aroma, and taste, but the texture sensory had a real effect and on the fungus, sensory had no significant effect. The best results for sensory assessment are in the V1L1 treatment which has a value of appearance 7.62, aroma 7.64, taste 7.93 and texture 7.42. The best treatment on the total number of bacteria (TPC) showed the best value, namely V1L1 treatment with a value of 1.1 x 103 CFU / ml. The best treatment in chemical tests is in the treatment V1L1 with a moisture content value of 45.26%, while for the value of the PAH compound (Polycyclic Aromatic Hydrocarbon) the value is the same, <0.51 ppm both for vacuum and nonvacuum packaging techniques. Keywords: Cockle shells (Anadara granosa). Smoke, packaging, storage, room temperatureABSTRAKPenelitian ini bertujuan Untuk mengetahui  pengaruh faktor kemasan dan lama penyimpanan terhadap nilai organoleptik, jumlah total bakteri dan analisis kimia kerang darah asap. Karakteristik yang diuji yaitu sensori, kandungan kadar air, jumlah total bakteri (TPC) dan nilai  senyawa PAH (Polycyclic Aromatic Hydrocarbon) kerang darah asap. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari 6 perlakuan V1L1 (Teknik pengemasan vakum, lama waktu penyimpanan 2 hari), V2L1 (Teknik penemasan non vakum, lama waktu penyimpanan 2 hari), V1L2 (Teknik penemasan vakum, lama waktu penyimpanan 4 hari), V2L2 (Teknik penemasan non vakum, lama waktu penyimpanan 4 hari), V1L3 (Teknik penemasan vakum, lama waktu penyimpanan 6 hari),V2L3 (Teknik penemasan non vakum, lama waktu penyimpanan 6 hari) dan ulangan sebanyak tiga kali. Data hasil pengamatan dianalisa menggunakan ANOVA (Analysis of Variance) pada taraf  95%, apabila terdapat beda nyata (P>0,05) maka dilakukan uji lanjut dengan uji DMRT (Duncan Multiple Range Test) pada taraf nyata 95%. Hasil penelitian yang diperoleh menunjukkan bahwa teknik pengemasan dan waktu penyimpanan kerang darah asap memberikan pengaruh sangat nyata terhadap nilai sensori yang meliputi kenampakan, aroma, dan rasa, tetapi pada sensori tekstur memberikan pengaruh nyata dan pada sensori jamur berpengaruh tidak nyata. Hasil terbaik untuk penilaian sensori terdapat pada perlakuan V1L1 dimana memiliki nilai kenampakan 7,62, aroma 7,64, rasa 7,93 dan tekstur 7,42. Perlakuan terbaik pada jumlah total bakteri (TPC)  menunjukkan nilai terbaik yaitu perlakuan V1L1 dengan nilai 1,1 x 103 CFU/ml . Perlakuan terbaik pada uji kimia terdapat pada perlakuan V1L1 dengan nilai kadar air 45,26 %, sedangkan untuk nilai  senyawa PAH (Polycyclic Aromatic Hydrocarbon) nilainya sama yaitu <0,51 ppm baik yang teknik pengemasan vakum maupun non vakum.Kata kunci: kerang darah (Anadara granosa). pengasapan, pengemasan, penyimpanan, suhu ruang

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

1,1’-Biaceanthrylene and 2,2'-Biaceanthrylene: Models for Linking Larger Polycyclic Aromatic Hydrocarbons via Five-Membered Rings

2019 ◽  
Author(s):  
Yachu Du ◽  
Kyle Plunkett
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Electronic Properties ◽  
Aromatic Hydrocarbons ◽  
Model Systems ◽  
Redox Potentials ◽  
Dimer Model ◽  
Optical And Electronic Properties ◽  
Polycyclic Aromatic

We show that polycyclic aromatic hydrocarbon (PAH) chromophores that are linked between two five-membered rings can access planarized structures with reduced optical gaps and redox potentials. Two aceanthrylene chromophores were connected into dimer model systems with the chromophores either projected outward (2,2’-biaceanthrylene) or inward (1,1’-biaceanthrylene) and the optical and electronic properties were compared. Only the planar 2,2’-biaceanthrylene system showed significant reductions of the optical gaps (1 eV) and redox potentials in relation to the aceanthrylene monomer.<br>

Karakterisasi Komponen Aktif Asap Cair Cangkang Sawit Hasil Pemurnian

2016 ◽  
Vol 9 (1) ◽  
pp. 64-72
Author(s):  
Fauziati Fauziati ◽  
Eldha Sampepana
Keyword(s):  
Acetic Acid ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Activated Charcoal ◽  
Oil Refining ◽  
Gas Chromatography Mass Spectrometry ◽  
Antioxidant Compounds ◽  
Active Components ◽  
Liquid Smoke ◽  
Polycyclic Aromatic

Palm shell liquid smoke obtained by pyrolysis and redestilasi still produce a pungent smoke flavor and color of yellow to brownish yellow so that the necessary research purification of smoke that can be used as ingredients other than preservatives, such as antiseptic hand wash. The research objective is to reduce the stinging liquid smoke aroma, color is tawny and to identify the characterization of the active components of liquid smoke shell oil refining results in Gas Chromatography Mass Spectrometry (GC-MS). The purification process of liquid smoke with redistilled at a temperature of 2000C and by adding 4.5% zeolite adsorbent made three (3) times the resulting liquid smoke of distillate and residue. Liquid smoke produced from distillate and residue are added activated charcoal as much as 9%, 10.5% and 12%, then stirred with a shaker subsequently allowed to stand for 6 days and 10 days The results of the study showed that liquid smoke purification results of the residue by the addition of activated charcoal as 12% and the time saved for 10 days (A2B2C3) gives flavor and color by 1.94 of 1.84 is odorless, yellowish white color and clarity. While the characteristics of the active components of purification results are predominantly acetic acid and phenol compounds of residues that serve as preservatives, antibacterial and antioxidant compounds while PAH (Polycyclic Aromatic Hydrocarbon), namely tar, benzoperen, gualakol and siringoll (aroma causes) undetectedABSTRAKAsap cair cangkang sawit yang diperoleh melalui proses pirolisis dan redestilasi masih menghasilkan aroma asap menyengat dan warna kuning hingga kuning kecoklatan sehingga diperlukan penelitian pemurnian asap yang dapat digunakan sebagai bahan lain selain pengawet, seperti antiseptik pencuci tangan. Tujuan penelitian adalah  untuk mengurangi aroma asap cair yang menyengat, warna yang masih kuning kecoklatan dan untuk  mengidentifikasi karakterisasi komponen aktif asap cair cangkang sawit hasil pemurnian secara Kromatografi Gas Spektrometri Massa (GC-MS). Proses  pemurnian asap cair dengan  redistilasi pada suhu 2000C dan dengan menambahkan adsorben zeolit 4,5% yang dilakukan sebanyak 3 (tiga) kali  dihasilkan asap cair dari Destilat dan Residu . Asap cair  yang dihasilkan dari destilat dan residu ditambahkan arang aktif sebanyak 9%,10,5% dan 12%  kemudian diaduk dengan shaker selanjutnya didiamkan selama 6 hari dan 10 hari .Hasil penelitian menunjukkan bahwa asap cair hasil pemurnian dari residu dengan penambahan arang aktif sebanyak 12% dan waktu simpan selama 10 hari ( A2B2C3 ) memberikan aroma sebesar 1,94 dan warna sebesar 1,84 adalah tidak berbau ,  warna putih kekuningan dan jernih . Sedangkan  karakteristik  komponen aktif hasil pemurnian yang paling dominan  adalah  senyawa acetic acid dan phenol  dari residu yang berfungsi sebagai bahan pengawet, antibakteri dan antioksidan sedangkan senyawa PAH (Polycyclic Aromatic Hydrocarbon) yaitu tar, benzoperen,  gualakol  dan siringoll ( penyebab aroma ) tidak terdeteksi . Kata kunci : asap cair, cangkang sawit, komponen aktif, pemurnian, redestilasi 

Influence of Microalgae Extracts on the Toxicity of a Carcinogenic Polycyclic Aromatic Hydrocarbon, Benzo(a)pyrene, in Endothelial Cells

2019 ◽  
Author(s):  
Manon Le Goff ◽  
Antoine Delbrut ◽  
Rémi Pradelles ◽  
Odile Sergent ◽  
Dominique Lagadic-Gossmann ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Polycyclic Aromatic ◽  
Carcinogenic Polycyclic Aromatic Hydrocarbon
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