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  • *森元 陽子, 川原 幸一, 菊池 清志, 松山 孝司, 中島 結実子, 小薗(藤崎) 清香, 町頭 三保, 丸山 征郎, 和泉 雄一
    会議録・要旨集 フリー
  • *嶋田 照子, 菅野 直之, 好士 亮介, 小幡 純, 仙田 直樹, 田中 一, 落合 邦康, 伊藤 公一
    特定非営利活動法人 日本歯周病学会学術大会 プログラムおよび講演抄録集
    2007年 2007s 巻 B-8-1020
    発行日: 2007年
    公開日: 2007/05/07
    会議録・要旨集 フリー
  • 東畑 郁生, PRASAD S.K., 本多 剛, CHANDRADHARA G.P.
    地盤工学会論文報告集
    2002年 42 巻 4 号 77-88
    発行日: 2002/08/15
    公開日: 2008/02/29
    ジャーナル フリー
    The Gujarat earthquake in India occurred in January, 2001, and caused significant damage in the province of Gujarat. The Japanese Geotechnical Society sent a small reconnaissance team to the damaged region after the quake. The present text presents the report from this activity. The major attention of the team was focused on geotechnical aspects of the damage which were related to earthfill dams and harbor land fills. It was found that a significant portion of damage was concentrated in fills resting on soft natural soils. Swedish weight soundings which were conducted at two places demonstrated the existence of such a soft subsoil. From this, it was concluded that amplification of earthquake shaking as well as the permanent deformation in the soft foundation soil induced such kinds of damage as subsidence, cracking, and lateral spreading in overlying artificial fills. For the better seismic resistance of those affected fills during future earthquakes, the improvement of soft subsoil seems essential.
  • 蒋 通, 栗林 栄一
    土質工学会論文報告集
    1988年 28 巻 1 号 56-64
    発行日: 1988/03/15
    公開日: 2008/02/29
    ジャーナル フリー
    The boundary element method expanded in frequency domains is presented to analyze the dynamic interaction between an embedded flexible rectangular foundation and soil with consideration of the obliquely incident waves. Numerical results describing the influence of the flexibility of the foundation on the dynamic responses of the foundation due to obliquely incident waves indicate that the flexibility of actual foundations can diminish the reduction of translation responses and increase the rotational responses in the high frequency range. These phenomena are more conspicuous as the embedment ratio is larger and the value of the wave velocity ratio of the soil and the foundation approaches to unity. When the high frequency components of the input ground motion are important and the basement has higher flexibility (for example 2vs/
    1vs
    >0.
    4
    ), the analysis method which considers the basement as a rigid foundation may lead to unsafety estimations and the estimation of the flexibility of the foundation is necessary as analysing the effective input motion with consideration of the incident waves.
  • 山田 善一, 野田 茂
    土質工学会論文報告集
    1988年 28 巻 1 号 143-152
    発行日: 1988/03/15
    公開日: 2008/02/29
    ジャーナル フリー
  • Özkan ASLANTAŞ, Ebru Şebnem YILMAZ
    Journal of Veterinary Medical Science
    2017年 79 巻 6 号 1024-1030
    発行日: 2017年
    公開日: 2017/06/16
    [早期公開] 公開日: 2017/04/27
    ジャーナル フリー

    This study aimed to determine the prevalence of fecal carriage of extended spectrum β-lactamase (ESBL) and/or plasmidic AmpC β-lactamase (pAmpC) producing Escherichia coli among dogs (n=428) in Turkey. Polymerase chain reaction (PCR) and sequencing were used to characterize genes encoding β-lactamase and plasmid mediated quinolone resistance (PMQR). Antimicrobial susceptibility testing and PCRs for virulence genes and phylogenetic groups were also performed. Cefotaxime resistant

    E
    . coli isolates were detected in 95 (
    22
    .2%) of the swab samples. Sequencing analysis results showed occurrence of various β-lactamase genes: blaCTX-M-15 (62), blaTEM-
    1b
    (42), blaCMY-2 (
    22
    ), blaCTX-M-3 (16), blaCTX-M-
    1
    (15), blaOXA-
    1
    (
    9
    ) and blaSHV-12 (3) alone or in combination. The most frequently encountered phylogenetic group was group
    A1
    (35.
    8
    %), followed by group D2 (
    22
    .
    1
    %),
    B
    1
    (15.
    8
    %),
    D1
    (
    9
    .5%), A0 (7.
    4
    %),
    B22
    (5.3%) and
    B23
    (
    4
    .2%), respectively. PMQR genes, aac(6’)-Ib-cr,
    qnrS1
    and qnrB10 were detected in 25.3, 10.5 and
    1
    .
    1
    % of the isolates, respectively. While all isolates were susceptible to imipenem and amikacin, resistance rates to non-β-lactam antibiotics ranged from 20.0% for tobramycin to 56.
    8
    % for tetracycline. The virulence genes were only detected in 34 (36.2%) of the isolates and this isolates carried single or various combination of virulence genes of iucD, papC, papE, f17a-A and eaeA. Four isolates were identified as human virulent pandemic CTX-M-15 producing
    E
    . coli
    clone O25
    b
    :ST131/
    B
    2. To the best of our knowledge, this is the first study to show fecal carriage of ESBL/pAmpC type β-lactamase producing
    E
    . coli
    isolates among dogs in Turkey.

  • 香山 滉一郎, 森下 政夫, 張 国鋒
    粉体および粉末冶金
    2006年 53 巻 5 号 419-429
    発行日: 2006年
    公開日: 2006/12/19
    ジャーナル オープンアクセス
    The phase diagrams of the Ni-Mo-
    B
    and Ni-W-
    B
    ternary systems in the region of less than 50mol%
    B
    were constructed by thermodynamic calculation, based on the data obtained by thermodynamic measurement of the related materials. We found three ternary eutectic points and three or two ternary peritecto-eutectic points as follows:
    E1
    :L (1365K, 71.5mol%Ni-6.0mol%Mo-
    22
    .5mol%
    B
    )=(Ni)+
    Ni3B
    +
    NiMo2B2

    E2
    :L (1355K, 62.5mol%Ni-2.5mol%Mo-30.5mol%
    B
    )=
    Ni3B
    +
    Ni2B
    +
    NiMo2B2

    E3
    :L (1445K, 42.0mol%Ni-30.6mol%Mo-10.3mol%
    B
    )=(Ni)+NiMo+
    NiMo2B2

    P1
    :L (1812K, 34.
    9
    mol%Ni-42.3mol%Mo-
    22
    .
    8
    mol%
    B
    )+MoB=
    Mo2B
    +
    NiMo2B2

    P2:L (1633K, 42.3mol%Ni-40.
    4
    mol%Mo-17.3mol%
    B
    )+Mo=
    Mo2B
    +
    NiMo2B2

    P3:L (1812K, 53.5mol%Ni-33.7mol%Mo-12.
    8
    mol%
    B
    )+Mo=NiMo+
    NiMo2B2

    E1
    :L (1622K, 51.0mol%Ni-31.6mol%W-17.
    4
    mol%
    B
    )=(Ni)+W+
    NiW2B2

    E2
    :L (1260K, 71.0mol%Ni-7.0mol%W-
    22
    .0mol%
    B
    )=(Ni)+
    Ni3B
    +
    NiW2B2

    E3
    :L (1291K, 65.
    4
    mol%Ni-
    4
    .
    8
    mol%W-29.
    8
    mol%
    B
    )=
    Ni2B
    +
    Ni3B
    +
    NiW2B2

    P1
    :L (2115K, 23.
    8
    mol%Ni-43.
    1
    mol%W-33.
    1
    mol%
    B
    )+WB=
    W2B
    +
    NiW2B2

    P2:L (1657K, 48.
    9
    mol%Ni-33.
    1
    mol%W-18.0mol%
    B
    )+
    W2B
    =W+
    NiW2B2

    The calculated phase diagrams are expected to be useful for the development of new Ni-based heat-, corrosion- or wear-resistance alloys.
  • FRANÇOIS LE GOFFIC, FRÉDÉRIC TANGY, BERNARD MOREAU
    The Journal of Antibiotics
    1979年 32 巻 12 号 1288-1292
    発行日: 1979年
    公開日: 2006/04/12
    ジャーナル フリー
    A sample of [3H] tobrarnycin (5, 000 Ci/Mole) has been synthetized and incubated with
    the bacterial ribosome and its subunits. The results obtained show that this antibiotic has
    two types of binding sites. The primary one is probably responsible for the inhibition of
    protein synthesis whereas the secondary one is probably related to the misreading and reading
    tiirough of the messenger RNA.
  • Nobutoshi TANAKA, Ken-ichi HOSOI, Daizo TANAKA, Mimei TAKAHASHI
    Chemical and Pharmaceutical Bulletin
    1996年 44 巻 4 号 843-846
    発行日: 1996/04/15
    公開日: 2008/03/31
    ジャーナル フリー
    Chemical properties of ergosta-
    4
    , 6,
    8
    (14),
    22
    -tetraen-3-one (
    1
    ) were investigated. Though
    1
    is rather stable to acids or bases, it reacts easily with two moleculres of oxygen on irradiation with UV light to give 6α,
    -epidioxy-14α-hydroperoxyergosta-
    4
    , 7,
    22
    -trien-3-one (2), which is transformed successively to 6α, 7α;
    ,
    -diepoxy-14α-hydroperoxyergosta-
    4
    ,
    22
    -dien-3-one (3) and 14α-hydroperoxy-
    -hydroxyergosta-
    4
    , 7,
    22
    -triene-3, 6-dione (
    4
    ) under these reaction conditions.
  • 東坂 諒哉, 城 克己, 林 侑加子, 津村 ゆかり
    日本法科学技術学会誌
    2023年 28 巻 2 号 197-203
    発行日: 2023年
    公開日: 2023/07/31
    [早期公開] 公開日: 2023/04/20
    ジャーナル フリー

     The stability of

    Δ9
    ‒tetrahydrocannabinol acetate (
    Δ9
    ‒THC‒OAc) and
    Δ8
    ‒tetrahydrocannabinol acetate (
    Δ8
    ‒THC‒OAc) in
    e
    -liquid during storage was investigated.
    Δ9
    ‒THC‒OAc liquids in cartridges were stored at 80℃ or 30℃ for 28 days. The relative concentrations of cannabinoids in the liquids were measured by gas chromatography with flame ionization detection.
    Δ9
    ‒THC‒OAc decreased during storage at either temperature.
    Δ9
    ‒THC, a minor impurity, also decreased.
    Δ8
    ‒THC‒OAc liquid in a cartridge was stored at 80℃ for 57 days. The concentration of
    Δ8
    ‒THC‒OAc and
    Δ8
    ‒THC, a minor impurity, did not change during that time. Cannabinol acetate increased in all liquids, and unknown products were also detected by gas chromatography/mass spectrometry (GC/MS). The
    Δ9
    ‒THC‒OAc and
    Δ8
    ‒THC‒OAc liquids were subjected to GC/MS to detect representative diluents, glycerol, propylene glycol, and polyethylene glycol 400, but none of these were detected.

  • Tohru Takahashi, Hiroyuki Tsukuda, Hirokazu Kimura, Mitsuru Yoshimoto, Masayuki Tsujisaki
    Internal Medicine
    2010年 49 巻 5 号 447-451
    発行日: 2010年
    公開日: 2010/03/01
    ジャーナル オープンアクセス
    This report describes a patient with extramedullary relapse of acute myeloid leukemia (AML) without involving bone marrow. A 57-year-old man was diagnosed as having acute monoblastic leukemia with t(
    9
    ;11)(p
    22
    ;q23) and trisomy
    8
    . Ten months after achieving complete response (CR) with chemotherapy, masses developed in his left forearm and in the back of his thigh, preceded by enigmatic peripheral neurological symptoms. Aspiration from the forearm showed leukemic relapse, and fluorescence in situ hybridization (FISH) revealed that the majority of the cells had 11q23 anomaly and tetrasomy
    8
    . Bone marrow or meningeal relapse was not observed. To our knowledge, this is the first case report of clonal evolution associated with the development of myeloid sarcoma as a relapse in AML.
  • LIVIO SIROVICH
    地盤工学会論文報告集
    1996年 36 巻 4 号 23-34
    発行日: 1996/12/15
    公開日: 2008/02/29
    ジャーナル フリー
    Repetitive liquefactions in angular and subangular gravels from an alluvial fan, in the case of two earthquakes with accelerations lower than that of a former which had caused liquefaction some months before, are described. The liquefaction took place from the surface, down to a depth of approximately 10 m. Water laden with sediments spouted out for some tens of minutes after the strong motion ceased. Knowledge of the grain size distribution of the sediments inside the body of the alluvial fan roughly defines the areas of the fan prone to future liquefaction. Non-repetitive liquefaction in overconsolidated fine fluvio-lacustrine sand of glacial origin at the unusual depth of 14 m to 16 m is also described. From the observation of sand lifted up for 10 m inside a large diameter well, and of that which spouted out from several microvents, it was estimated that extra-pore pressure was close to lithostatic conditions. Nevertheless, modeling of intrinsic pore pressure buildup on the DESRA2 programme gives lower values than the experimental one. Geotechnical characteristics of the 12 m-thick sandy stratum indicate that the upper part is unusually soft, either due to water circulation or past repetitive liquefactions which prevented reconsolidation. It is suggested that excess pore pressure generated by the earthquake was also due to redistribution of pressure from adjacent sediments.
  • ALI TABESH, HARRY G. POULOS
    地盤工学会論文報告集
    2001年 41 巻 3 号 1-16
    発行日: 2001/06/15
    公開日: 2008/02/29
    ジャーナル フリー
    In the seismic analysis of pile foundations the soil is often assumed to be an elastic material and the pressure at the soil pile interface is not limited during the analysis. This may result in a considerable error, as the computed pressure from an elastic analysis may go well beyond the ultimate lateral pressure of real soil. In fact, significant yielding at the soil-pile interface has been observed during real earthquakes, and also in laboratory tests. The yield zone is usually near the ground surface where the effect of inertial force due to the superstructure is higher. This yielding redefines the pile response, and in general cannot be ignored. In order to examine the effects of soil yielding on the internal pile response during earthquakes an approximate analysis is described in this paper which is an extension of a static method developed by the second author (1982) for the analysis of piles subjected to lateral soil movement. This method is then used to investigate the effects of soil yielding on the internal response of piles through a comparative study in which real earthquakes are used. It is shown that for strong earthquakes and heavily loaded piles the soil yielding may considerably increase the amount of maximum pile moment developed in the pile. A marked difference in the effects of yielding on the pile moment and shear is observed and discussed.
  • ABDALLAHI.HUSEIN MALKAWI, ROBERTY. LIANG
    地盤工学会論文報告集
    1996年 36 巻 3 号 67-74
    発行日: 1996/09/15
    公開日: 2008/02/29
    ジャーナル フリー
    The interaction between a penetrating shaft and the surrounding soil media under impact loading is a frequently encountered phenomenon in geotechnical engineering. Examples of such dynamic soil/shaft interaction would include dynamic pile driving, standard penetration testing (SPT), and dynamic driven rod test. Presented in this paper is a novel approach, based on the principle of dynamic system identification, which enables identification of dynamic soil-pile interaction model parameters. The analytical transfer function, relating the output stress wave forms to the input stress wave forms in the soil/shaft system, is derived using the Laplace and Fourier Transform techniques and the one-dimensional wave propagation theories. A numerical solution algorithm based on a variation of gradient method is coded into a micro-computer based program to solve the frequency-dependent soil-pile interaction parameters (Smith model) : soil damping and soil spring stiffness. To further reduce the amount of computational effort required in the solution of the frequency-dependent dynamic soil properties, it is suggested that the solution be obtained for the first-mode natural frequency of the measured stress waves. The results obtained from this simplified solution algorithm, when compared with both numerical simulations and controlled laboratory tests, are reasonably acceptable. The proposed parameter identification technique offers a viable alternative data interpretation procedure for deducing pertinent Smith model parameters used frequently in pile driving analysis.
  • TORU SHIBATA, FUSAO OKA, YOSHIO OZAWA
    地盤工学会論文報告集
    1996年 36 巻 Special 号 65-79
    発行日: 1996年
    公開日: 2012/08/13
    ジャーナル フリー
    The results of an investigation of soil liquefaction caused by the 1995 Hyogoken-Nambu earthquake are described. Massive and extensive soil liquefaction occurred in the coastal areas of reclaimed land, in old river beds, in Holocene deposits and in areas reclaimed from old ponds. A man-made island of weathered granite, or “Masado, ” was also seriously damaged by soil liquefaction. The maximum distance from the epicenter to the liquefied sites was approximately 90 km. Several characteristics of liquefaction formation, strong earthquake motions recorded on Port Island, and damage to structures from this earthquake are discussed.
  • Misaki Kojima, Takeya Morozumi
    Journal of Health Science
    2004年 50 巻 5 号 518-529
    発行日: 2004年
    公開日: 2004/10/01
    ジャーナル フリー
    Six full-length cDNAs encoding pig cytochrome P450 (CYP) enzymes, CYP
    1
    A
    1
    , CYP2A19, CYP2
    B
    22
    , CYP2C33v
    4
    , CYP2C49, and CYP2
    E
    1
    , were isolated and sequenced. The cDNA sequences of pig CYP
    1
    A
    1
    , CYP2A19, CYP2
    B
    22
    , CYP2C49, and CYP2
    E
    1
    showed high similarity to human
    CYP1A1
    (
    85
    .
    4
    %), CYP2A13 (88.6%),
    CYP2B6
    (81.
    1
    %), CYP2C18 (
    85
    .3%), and
    CYP2E1
    (82.5%), respectively, and pig
    CYP2C33v4
    cDNA showed high similarity to rat CYP2C23 (79.2%). Reverse transcription-polymerase chain reaction (RT-PCR) assays revealed hepatic gene expression of all these pig CYP enzymes: the order of expression was
    CYP2C33v4
    and
    CYP2E1
    > CYP2C49 >
    CYP1A1
    and CYP2A19 >
    CYP2B22
    . In the kidney, the
    CYP2C33v4
    gene was expressed at the same level as in the liver, but the
    CYP1A1
    , CYP2A19, and
    CYP2B22
    genes were expressed at lower levels than in the liver. Little renal gene expression of CYP2C49 and CYP2
    E
    1
    was observed. We revealed for the first time the full-length cDNA sequences encoding pig CYP
    1
    A
    1
    and five CYP enzymes belonging to the CYP2 gene family, thus making it possible to examine the gene expression levels of these CYP enzymes in pig tissues by RT-PCR.
  • Mohd Suhail, Mohd Faizul Suhail, Hina Khan
    Journal of Clinical Biochemistry and Nutrition
    2008年 43 巻 3 号 210-220
    発行日: 2008年
    公開日: 2008/10/31
    ジャーナル フリー
    We compared three groups of pregnant women: placebo with normotensive women, group A which included preeclamptics, and group
    B
    which comprised preeclamptics who were supplemented their diets with vitamins C and
    E
    . MDA increased from 6.
    22
     ± 2.
    8
    (placebo) to
    8
    .48 ± 
    1
    .2 (A) and
    8
    .02 ± 
    1
    .
    8
     nmol/gHb (
    B
    ). NO concentrations were enhanced from 19.3 ± 
    4
    .2 (P) to 23.
    8
     ± 6.
    4
    (A) and 24.
    1
     ± 5.
    4
     μmol/L (
    B
    ). GSH contents were decreased from 10.42 ± 2.81 (P) to
    8
    .02 ± 2.92 (A) and
    9
    .39 ± 
    1
    .02 μmol/g Hb (
    B
    ), whereas GSSG concentrations increased from 0.98 ± 0.28 (P) to
    1
    .24 ± 0.29 (A) and
    1
    .08 ± 0.12 μmol/g Hb (
    B
    ). SOD activity decreased 23% in A and 14% in
    B
    ; GRx decreased 27% in A and 5.5% in
    B
    ; GPx decreased 12% in A and
    9
    .6% in
    B
    . Catalase activity, however, increased 27% in A and 29% in
    B
    as compared to control. Thus, we conclude that the use of vitamins C and
    E
    should be considered for the control of certain important biochemical indices during the development of preeclampsia; however, further studies are needed to develop methods for the prevention of preeclampsia in women at high risk.
  • Sultan Samran Al-Lihaibi, Seif-Eldin Nasr Ayyad, Fekry Shaher, Walied Mohamed Alarif
    Chemical and Pharmaceutical Bulletin
    2010年 58 巻 12 号 1635-1638
    発行日: 2010/12/01
    公開日: 2010/12/01
    ジャーナル フリー
    From the black coral Antipathies dichotoma, a sphingolipid (2S*,3S*,
    4E
    ,
    8E
    )-2N-[tetradecanoyl]-
    4
    (
    E
    ),
    8
    (
    E
    )-icosadiene-
    1
    ,3-diol (
    1
    ) and a steroid (
    22E
    )-methylcholesta-5,
    22
    -diene-
    ,3β,7α-triol (2) were isolated. Other known compounds, 3β,7α-dihydroxy-cholest-5-ene (3), (
    22E
    ,24S),5α,
    -epidioxy-24-methylcholesta-6,
    22
    -dien-3β-ol (
    4
    ) and (
    22E
    ,24S),5α,
    -epidioxy-24-methylcholesta-6,
    9
    (11),
    22
    -trien-3β-ol (5). The structures were established on the basis of NMR spectroscopic analysis and comparison with literature. The antibacterial activity of five compounds was evaluated.
  • 小林 優, 家坂 貴子, 中野 江身子, 平山 耕一郎
    天然有機化合物討論会講演要旨集
    1989年 31 巻 71/P2-1
    発行日: 1989/09/17
    公開日: 2017/08/18
    会議録・要旨集 フリー
    Six new cembranoids sarcophytol P (3), R (
    4
    ), S (5), K (
    8
    ), F (11), and T (13) were isolated from the soft coral Sarcophyton glaucum. Sarcophytol P (3) was shown to be the 20-hydroxy derivative of the major component sarcophytol A (
    1
    ), and afforded the cyclization product 6 in CHCl_3 at room temperature, in a same way as in
    1
    . Sarcophytols R (
    4
    ) and S (5) were correlated to
    1
    , by conversion of its 7R,
    8
    R and 7S,
    8
    S epoxide derivatives. Sarcophytol K(
    8
    ) was a 13, 14-dihydroxycembranoid having a
    1
    E
    ,3Z-diene moiety. The absolute configuration of
    8
    and its
    1
    Z,3
    E
    - and
    1
    Z,3Z-isomers sarcophytol
    B
    (2) and J (10) were determined by circular dichroism study of their bis-p-dimethylaminobenzoate derivatives. Sarcophytols F (11) and T (13) were
    1
    E
    - and
    1
    E
    ,3Z-isomers of
    1
    . Compound 11 showed characteristic broadening of the ^
    1
    H-NMR chemical shifts, due to the restricted conformational interconversion. Using the three cembranoids sarcophytols F (11,
    1
    E
    ,3
    E
    ), N (15,
    1
    Z,3Z) and T (13,
    1
    E
    ,3Z), spontaneous autoxidation-cyclization, in CHCl_3,was examined, in order to compare the stereochemical course of the reaction with that of
    1
    (
    1
    Z,3
    E
    ), which affords trans-fused bicyclo[
    9
    .3.0]tetradecene systems. The
    1
    E
    ,3Z-isomer 13 gave the same cyclization product 18, as in the reaction of
    1
    , even though it is isomeric at C-
    1
    ,3. The
    1
    Z,3Z isomer 15 gave 19, in consequence of the reversed geometry at C-3 of 15. The
    1
    E
    ,3
    E
    -isomer (11) gave the bicyclic product
    22
    , having an antipodal fusion as compared with 19. This was confirmed by PCC oxidation of 19 and
    22
    , giving enantiomeric ketones 23 and 24 respectively. The
    1
    (14)-epoxide 26 was shown to be the immediate precursor of
    22
    , and acounted for the inversion of the geometry at C-
    1
    of the cyclization product. Compound 26 is isomeric with the epoxide 17 derived from
    1
    . The epoxide 17 is the postulated precursor in the conversion of 13 to 18. It is noteworthy that the mode of antipodal fusion of the cyclopentane rings, in 18 and
    22
    , was controlled by the chirality of the epoxy rings. The C-14 hydroxyl group participates in the transannular cyclization, but was found not to be the requisite functional group for the reaction. Similar treatment of cembrene C (30), the parent hydrocarbon of
    1
    , also reacted in CHCl_3 giving the bicyclic product 32.
  • 辻川 健治, 川上 貴大, 荒木 渉, 佐藤 高広, 伊藤 さよ, 和泉 要, 保戸田 滉樹, 岩田 祐子
    日本法科学技術学会誌
    2023年 28 巻 2 号 145-157
    発行日: 2023年
    公開日: 2023/07/31
    [早期公開] 公開日: 2023/04/20
    ジャーナル フリー

     We examined the stability of

    Δ9
    -tetrahydrocannabinol acetate (
    Δ9
    -THC-OAc) and
    Δ8
    -tetrahydrocannabinol acetate (
    Δ8
    -THC-OAc) in
    e
    -liquid products. Eight samples were heated at 30℃ for 28 days and one of them was heated at 70℃ for 2,
    4
    ,
    8
    , 10, and 15 days. Residual ratios of
    Δ9
    -THC-OAc and
    Δ8
    -THC-OAc were evaluated by gas chromatography with flame ion detection and their degradation products were examined by gas chromatography/mass spectrometry (GC/MS). Some samples were tested for solubility in hexane and were submitted to GC/MS analysis to detect propylene glycol and glycerol. After a 28-day incubation at 30℃,
    Δ9
    -THC-OAc was slightly decomposed (residual ratio: 84.5–94.2%) but
    Δ8
    -THC-OAc was almost stable (residual ratio: 95.2–108.
    9
    %). Heating at 70℃ decomposed not only
    Δ9
    -THC-OAc but also
    Δ8
    -THC-OAc. The decomposition proceeded rapidly in the initial 2 days then slowly until 15 days later. The degradation products, four putative one-oxygen-atom adducts and cannabinol, were detected but deacetylated products (
    Δ9
    -tetrahydrocannabinol and
    Δ8
    -tetrahydrocannabinol) were not detected. All the samples tested were completely dissolved in hexane differently from propylene glycol and glycerol. Propylene glycol and glycerol were not detected from the samples completely dissolved in hexane. This study indicated that deacetylation of
    Δ9
    -THC-OAc and
    Δ8
    -THC-OAc did not proceed when the sample did not contain propylene glycol and glycerol.

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