• 제목/요약/키워드: gamma-irradiated

검색결과 1,183건 처리시간 0.024초

감마선을 이용한 케나프 펄프 표면의 Poly(ethylene glycol) Methacrylate 그라프트 중합반응 (Surface Graft Polymerization of Poly(ethylene glycol) Methacrylate onto Kenaf Pulp using Gamma-ray Irradiation)

  • 오두리;전준표;강필현
    • 방사선산업학회지
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    • 제6권3호
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    • pp.251-255
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    • 2012
  • Pulp is typically used for paper industry to manufacturing various types of papers. However simply chemical modification makes enable the pulp to a wide range of application in various industrial fields. To bring the polymerization the gamma ray irradiated on the mixture of kenaf and PEGMA in various dose ranges from 20 to 60 kGy. As a results, the graft degree of 20.0% was obtained from 475 g of gamma ray irradiated pulp and PEGMA. After the polymerization, the chemical structure and morphology of the surfaces were examined by Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscope. Chemical structure of grafted pulp has significantly growth in carbonyl content with increasing the radiation dose. Also surface morphology was distinctly changed with decreased the degree of roughness and increasing the diameter. These results were explained gamma ray irradiation improve performance of graft polymerization efficiency.

Physical and Microbiological Approach in Proving the Identity of Gamma-irradiated Different Teas

  • Kausar, Tusneem;Kim, Byeong-Keun;Kim, Dong-Ho;Kwon, Joong-Ho
    • Food Science and Biotechnology
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    • 제14권1호
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    • pp.1-5
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    • 2005
  • Photostimulated luminescence (PSL), thermoluminescence (TL), electron spin resonance (ESR), and direct epiflourescent filter technique/aerobic plate count (DEFT/APC) were applied to detect dried green, black, and oolong teas irradiated between 0-10 kGy. Teas irradiated at 2.5 kGy and higher showed over 5000 photon counts/60 sec, while non-irradiated teas yielded 650-1000 photon counts/60 sec. TL glow curves for minerals separated from teas were detected at about $300^{\circ}C$ with low intensity in non-irradiated samples, whereas around $150^{\circ}C$ with high intensity in all irradiated samples. Ratio of $TL_1/TL_2$ based on re-irradiation step, showing lower than 0.1 and higher than 1.44 for non-irradiated and irradiated samples, respectively, enhanced reliability of TL results. ESR measurements for irradiated teas showed signals specific to irradiation. Log DEFT/APC ratio increased with irradiation dose; this result could be applied to identify irradiated tea samples.

저선량 감마선 조사가 옥수수 녹말의 이화학 성질 및 저항전분 생성에 미치는 영향 (Effects of Low-Dose Gamma Irradiation on Physicochemical Properties and Formation of Resistant Starch of Corn Starch)

  • 김성곤;김정희;권중호
    • 한국식품과학회지
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    • 제38권3호
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    • pp.378-384
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    • 2006
  • 저선량의 감마선 조사(0-9.1 kGy)에 의하여 옥수수녹말의 고유 점도는 감소, 겉보기 아밀로오스 함량, 물 결합능력, 팽윤력과 용해도는 증가하였다. RVA 또는 아밀로그래프 점도는 조사선량이 증가함에 따라 감소하였으나 DSC에 의한 흡열 전이에는 큰 영향이 없었다. 감마선 조사한 옥수수 전분을 이용한 저항전분 생성은 효과가 없었다.

감마선 조사된 새우의 검지를 위한 면역분석법의 적용 (Application of Immunoassay for the Detection of Gamma-Irradiated Shrimp)

  • 이주운;육홍선;조경환;차보숙;변명우
    • 한국식품영양과학회지
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    • 제30권4호
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    • pp.600-604
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    • 2001
  • 감마선 조사된 새우의 신속한 판별을 위한 방법으로 갈색새우의 TPM을 항원으로 하여 개별적으로 생산된 M-IgG와 P-IgG를 이용한 Sandwich ELISA를 분석법으로 확립하였다. M-IgG를 항원 포획을 이한 coating 항체로 사용하고, P-IgG를 포획된 TPM에 대한 반응항체로 사용하였을 때, 12.5에서 50$\mu\textrm{g}$/mL의 농도 범위에서 TPM을 정량할 수 있었다. 감마선 조사된 새우의 TPM 농도는 선량에 의존하며 감소하였고, 감마선 조사와 가열 또는 냉동 등의 병용 처리에서도 선량에 의존하며 감소하였다. 이 결과는 면역분석기법의 하나인 Sandwich ELISA가 감마선 조사된 새우의 검지법으로 이용될 수 있다는 가능성을 나타내었다.

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방사선 조사미의 안정성 연구(제1보) -시험동물의 사료섭취량, 증체량, 사료효율 및 성장도에 관하여- (Studies on the Wholesomeness of the Gamma-irradiated Rice (I) -On the Food Consumption, Weight Gain, Food Efficiency and Growth Rate of Mice-)

  • 박창규;김성기;김홍열;김형수
    • 한국식품과학회지
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    • 제3권2호
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    • pp.110-116
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    • 1971
  • 50 및 100 Krad의 감마선을 조사한 미곡의 안전성을 실험할 목적으로 400 마리의 실험백쥐를 사용해서, 이 실험동물의 사료를 방사선 처리 사료구(LLTG, HLTG)와 비 방사선 처리 사료구(NCG, PCG)로 구분하고 7개월간 사육시키면서 이를 사료종류에 따르는 사료 섭취량 증체량, 사료효율 및 성장도를 측정하였다. 그 결과는 각 시험구(NCG, PCG, LLTG, HLTG)간에 있어서, 백쥐의 사료 섭취량, 증체량, 사료 효율 및 성장도의 변화가 통계적으로 유의차가 없었다.

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Effect of Gamma Irradiation on the Biological Activities and Color Changes of Ethanol Extracts Lonicera japonica

  • Jeon, Tae-Woog;Cheorun Jo;Shin, Myung-Gon;Cha, Bo-Sook;Kim, Mi-Jung;Byun, Myung-Woo
    • Preventive Nutrition and Food Science
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    • 제8권1호
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    • pp.85-88
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    • 2003
  • Effects of irradiation on color removal, tyrosinase inhibition, xanthine oxidase inhibition and nitrite scavenging capacity of Lonicera japonica extracts were evaluated. Lonicera japonica extracts were irradiated at 10, 20, and 30 kGy. Hunter color $L^{*}$- and $a^{*}$-values increased but $b^{*}$-values decreased dose-dependently following irradiation. The extracts were potent inhibitors of tyrosinase and xanthine oxidase. Tyrosinase inhibition was higher in the irradiated sample than non-irradiated, and subsequently increased with increasing irradiation doses. The extracts had a higher inhibitory effect against xanthine oxidase, and the effect was not changed by irradiation. Nitrite scavenging capacity was the highest in the extract at pH 1.2, and was not significantly affected by irradiation. These results indicate that gamma irradiation may not influence the biological activities of Lonicera japonica extracts when irradiated up to 30 kGy. Furthermore, color of the extracts can be improved to have improved applicability for the food and cosmetic industries without any adverse change in biological functions.ons.s.

Detection of Radiation-Induced Hydrocarbons in Green, Black and Oolong Teas

  • Kausar, Tusneen;Lee, Jung-Eun;Noh, Jung-Eun;Kwon, Young-Ju;Kwon, Joong-Ho
    • Preventive Nutrition and Food Science
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    • 제9권3호
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    • pp.222-226
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    • 2004
  • Hydrocarbons induced by gamma-irradiation of green, black, and oolong teas were analyzed to determine whether the hydrocarbons can be used as markers for detecting post-irradiation of these teas. The samples were irradiated at 0, 2.5, 5, 7.5, and 10 kGy. Detection was attempted by extracting fat from the teas, separation of hydrocarbons with florisil column chromatography, and identification of hydrocarbons by gas chromatography-mass spectroscopy (GC-MS). Concentration of hydrocarbons increased with the irradiation dose. The major hydrocarbons in irradiated green, black, and oolong teas were 1-tetradecence (14:1), pentadecane (15:0), 1,7-hexadecadiene (16:2), 1-hexadecene (16:1), 8-heptadecene (17:1), and heptadecane (17:0). Radiation-induced hydrocarbons in teas were 1,7-hexadecadiene and 8-heptadecene. These compounds were not detected in non-irradiated samples, so the hydrocarbons (16:2, 17:1) can be used as markers for detecting post-irradiation of the teas. Furthermore, detection of hydrocarbons after 12 months storage at room temperature remains a suitable method for identifying irradiated teas.

고선량 감마선을 조사한 벼에서 SOD isoenzyme들의 유전자 발현 및 효소활성 (Expression of Superoxide Dismutase Isoenzyme Genes and Enzyme Activities in Rice Irradiated with a High-Dose Gamma Ray)

  • 채효석;김진홍;정병엽;김재성;위승곤;백명화;조재영
    • 생명과학회지
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    • 제16권2호
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    • pp.180-185
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    • 2006
  • 일품벼(Oryza sativa L. cv. Ilpoombye)에 고선량 감마선을 조사한 후 벼 잎의 생리적 손상과 항산화 효소인 superoxide dismutase (SOD)의 isoenzyme 수준에서의 유전자 발현 및 효소활성 변화와의 연관성을 조사하였다. 500 Gy의 감마선 조사는 24 h 이내에 벼 잎의 단백질, 엽록소, 그리고 카로테노이드의 함량을 유의적으로 감소시켰으며 특히 엽록소는 대조구에 비해 26% 이상 감소하였다. 반면에 SOD isoenzyme들의 유전자 발현은 감마선 조사 후 6 h부터 24 h까지는 전반적으로 대조구보다. 높게 유지되었으나 48 h부터 현저히 감소되어 72h에는 모든 isoenzyme들의 유전자 발현 이 대조구보다. 낮았다. 그러나 isoenzyme들의 효소활성은 조사구에서 일부 CuZn-SOD isoenzyme들의 경우 48 h까지 대조구보다. 약간 높았지만 72h에는 모두 현저히 감소하였다. 따라서 본 연구에 사용된 500 Gy의 고선량 감마선은 단백질, 엽록소, 그리고 카로테노이드 함량의 감소를 초래하며, 조사 후 초기단계에는 이러한 생리적 손상과 무관하게 일시 적으로 SOD isoenzyme들의 유전자 발현을 증가시키지만 72 h 이후에는 유전자 발현과 효소활성을 동시에 감소시키면서 산화스트레스에 의한 생리적 손상을 유도하는 것으로 생각된다.

Effect of Gamma Irradiation on Shelf-life Extension and Sensory Characteristics of Dak-galbi (Marinated Diced Chicken) during Accelerated Storage

  • Yoon, Yo-Han;Cho, Won-Jun;Park, Jin-Gyu;Park, Jae-Nam;Song, Beom-Seok;Kim, Jae-Hun;Byun, Myung-Woo;Kim, Cheon-Jei;Sharma, Arun K.;Lee, Ju-Woon
    • 한국축산식품학회지
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    • 제29권5호
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    • pp.573-578
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    • 2009
  • This study examined the effect of gamma irradiation on shelf-life extension and sensory characteristics of dak-galbi. Commercial dak-galbi sauce was gamma-irradiated at 0, 5, 10, 15, 20, 25, and 30 kGy. The dak-galbi sauce (200 g) was then added to diced chicken (800 g) for cooking, and the cooked dak-galbi samples in vacuum bags were stored at $35^{\circ}C$ for 5 d. Dak-galbi samples were analyzed on d 0, 1, 2, 3, 4, and 5 for microbial analysis (plate count agar), thiobarbituric acid (TBARS) and volatile basic nitrogen (VBN) measurements, and on d 0 for sensory evaluation. On d 0, total bacterial populations were below detection limit after dak-galbi marinated with the gamma-irradiated (${\geq}15\;kGy$) sauces were cooked, and the samples marinated with higher dose irradiated dak-galbi sauce had lower (p<0.05) bacterial populations during storage. TBARS values of the dak-galbi samples marinated with non-irradiated sauce were not different ($p{\geq}0.05$) with those marinated with irradiated sauces on d 0, and the TBARS values increased (p<0.05) during storage at $35^{\circ}C$, regardless of irradiation dose. In the VBN analysis, there was no difference ($p{\geq}0.05$) in VBN values among irradiation doses on d 0, but VBN values decreased (p<0.05) as irradiation dose increased during storage. Moreover, there were no significant differences ($p{\geq}0.05$) in sensory characteristics among irradiation doses. These results indicate that use of gamma irradiation on dak-galbi sauce may be useful in shelf-life extension without compromising the sensory characteristics of dak-galbi.

감마선 조사가 건조-발효소시지의 Trans 지방산, 유리아미노산 및 관능검사 특성에 미치는 영향 (Effect of Gamma-Irradiation on Trans Fatty Acid, Free Amino Acid and Sensory Evaluation of Dry-fermented Sausage)

  • 김일석;양미라;조철훈;안동욱;강석남
    • 한국축산식품학회지
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    • 제31권4호
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    • pp.580-587
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    • 2011
  • 본 연구는 감마선 조사가 건조-발효햄의 조직감, 지방산, 유리아미노산 및 관능적 특성에 미치는 영향을 조사하기 위해 실시하였다. 경도(hardness) 및 부착성(adhesiveness) 의 경우 조사 처리구가 유의적으로 낮게 나타났다(p<0.01). 검성(gumminess)의 경우에는 2 및 4 kGy처리구가 대조구 및 1 kGy처리구보다 유의적으로 높은 값을 나타내었다(p<0.01). 지방산의 경우 처리구의 포화지방산(SFA)(C14:0, C16:0, C18:0)은 유의적으로 높았고(p<0.05), 불포화지방산 (UFA)(C16:1, C18:1 및 C18:3), trans 지방산, n-3 및 n-6 지방산 의 함량은 4 kGy처리에서 감소하였다(p<0.05). 감마선 조사처리는 phosposerine, aspartic acid, glutamic acid를 증가 시켰으나, lysine은 감소시켰다(p<0.05). 관능검사의 경우, 황취(sulfur odor) 및 지방산화 맛(fat pungent flavor)은 4 kGy에서 가장 높게 나타났으며(p<0.05), 곰팡이 냄새(moldy odor) 및 곰팡이 맛(moldy flavor)은 낮게 나타났다(p<0.05). 이상의 결과 감마선 조사가 조직감, 지방산조성 및 관능적 특성에 영향을 미쳤다.