수박종자의 건열 처리가 발아 및 유묘생장에 미치는 효과

박은지,이정은,안성광,제병일,박영훈,이용재,최영환,강점순 한국환경과학회 2023 한국환경과학회지 Vol.32 No.2

This study was conducted to investigate changes in seed vigor based on temperature of dry heat and duration treatment of watermelon seeds and examine the effect on percent of emergence and seedling vigor. When the upper limit temperature of dry heat treatment was raised to 80℃, the percent of the germination decreased. Moreover, T50 was delayed as the upper limit temperature of dry heat treatment increased. The higher the upper limit temperature of dry heat treatment and the longer the treatment period, the higher the percentage of abnormal seedlings. The optimum upper limit temperature for dry heat treatment was 72℃, and the treatment period was five days. Seed vigor was better maintained at 30℃, 45℃, and 52℃, followed by stepwise exposure to high temperatures of 72℃, the upper limit of dry heat treatment, rather than dry heat treatment at a high temperature of 72℃ for 5 days from the initial stage of treatment. When the fungicide was added during the dry heat treatment process, the germination percentage decreased and the percent of the abnormal seedling percentage increased. However, the addition of 10 mg/kg fungicide did not significantly reduce seed vigor.

Enhanced Virus Safety of a Solvent/Detergent-Treated Anti-hemophilic Factor IX Concentrate by Dry-Heat Treatment

Shin Jeong-Sup,Choi Yong-Woon,Sung Hark-Mo,Ryu Yeon-Woo,Kim In-Seop The Korean Society for Biotechnology and Bioengine 2006 Biotechnology and Bioprocess Engineering Vol.11 No.1

With particular regards to the hepatitis A virus (HAV), a terminal dry-heat treatment ($100^{\circ}C$ for 30 min) process, following lyophilization, was developed to improve the virus safety of a solvent/detergent-treated antihemophilic factor IX concentrate. The loss of factor IX activity during dry-heat treatment was of about 3%, as estimated by a clotting assay. No substantial changes were observed in the physical and biochemical characteristics of the dry-heat-treated factor IX compared with those of the factor IX before dry-heat treatment. The dry-heat-treated factor IX was stable for up to 24 months at $4^{\circ}C$, The dry-heat treatment after lyophilization was an effective process for inactivating viruses. The HAV and murine encephalomyocarditis virus (EMCV) were completely inactivated to below detectable levels within 10 min of the dry-heat treatment. Porcine parvovirus (PPV) and bovine herpes virus (BHV) were potentially sensitive to the treatment. The log reduction factors achieved during lyophilization and dry-heat treatment were ${\ge}5.60$ for HAV, ${\ge}6.08$ for EMCV, 2.64 for PPV, and 3.59 for BHV. These results indicate that dry-heat treatment improves the virus safety of factor IX concentrates, without destroying the activity. Moreover, the treatment represents an effective measure for the inactivation of non-lipid enveloped viruses, in particular HAV, which is resistant to solvent/detergent treatment.

Complexation of high amylose rice starch and hydrocolloid through dry heat treatment: Physical property and <i>in vitro</i> starch digestibility

Oh, Im Kyung,Bae, In Young,Lee, Hyeon Gyu Elsevier 2018 Journal of cereal science Vol.79 No.-

<P><B>Abstract</B></P> <P>High amylose rice starch was modified by dry heat treatment for different heating times (0, 1, 2, and 4 h) after mixing with various hydrocolloid type (carboxymethyl cellulose (CMC), guar gum, and xanthan gum) to improve its processability and nutritional properties. The hydration/pasting properties, gel texture, and <I>in vitro</I> starch digestibility of dry heat treated hydrocolloid-starches were investigated and analyzed by principle component analysis (PCA). Dry heat treatment increased the pasting properties of rice starch, although a longer heating time led to lower pasting and hydration properties as well as gel strength. Highest peak viscosity and gel strength were observed for dry heat treated xanthan-starch, followed by CMC- and guar-starch. In the results of <I>in vitro</I> starch digestibility, dry heat treatment significantly decreased the rapidly digestible starch contents and predicted glycemic index (pGI) compared to native starch, while dry heat treated xanthan starch most effectively retarded starch digestibility. PCA indicated that hydrocolloid type affected the hydration properties, and that heating time was correlated with pasting properties and pGI. These results demonstrated that high amylose rice starch dry heat treated with xanthan for 2 h could be effective in changing the hydration, pasting and gel characteristics as well as <I>in vitro</I> starch digestibility.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High amylose rice starch was dry heat treated with hydrocolloid type and heating time. </LI> <LI> The higher heating time led to the lower swelling power and pasting viscosity. </LI> <LI> Xanthan was more effective for delaying starch digestibility than CMC or guar gum. </LI> <LI> There were significant Pearson correlations between gel strength and digestibility. </LI> <LI> DHT with xanthan for 2 h was the optimum preparation of retarded starch hydrolysis. </LI> </UL> </P>

단소용 대나무재의 열처리 및 건조

변희섭,오승원,공태석,김종만 한국산림바이오에너지학회 2002 산림바이오에너지 Vol.21 No.3

본 연구는 단소용 대나무 악기재를 효과적으로 건조하기 위하여 열처리 및 몇 가지 스케줄에 의한 건조를 실시하였다. 평균 직경 2.2cm, 길이 60cm정도의 솜대를 이용하였다. 열처리 효과를 평가하기 위하여 무처리 및 열처리재로 구분하였으며 적당한 건조 조건 조사를 위해서 20℃, 65%와 40℃, 40% 그리고 대기상태의 3가지 조건으로 실시하였다. 탄화와 재색의 결함이 발생하지 않는 열처리의 최적 온도 조건은 180℃정도가 적당하였으며 열처리가 할렬의 수와 할렬 크기의 발생을 줄였으며 건조결함을 발생하지 않는 최적의 조건은 온도 20℃, 관계습도 65%이지만 건조를 할 때 기간이 너무 많이 소요되는 단점이 있기 때문에 40℃, 40%에서 건조시키는 것이 더욱 효율적이었다. This study was carried out to investigate a heat treatment condition and suitable drying schedule of bamboo material(Phyllostachys nigra var. henonis) for a vertical flute with small-notched bamboo. It is very important to prevent drying defects during its drying process. We investigated the effort of heat treatment the most suitable drying schedule for small-notched bamboo vertical flute without drying defects in this research. A direct heat treatment method and drying conditions of 3($20^{\circ}C$ 65%, $40^{\circ}C$ 40%, and dry at air condition) were applied to the Bamboo specimen that felled in several areas for a month. The result suggested that the most suitable drying schedule with the less split and the shortest time was to dry at $40^{\circ}C$, 40% condition and it was useful to direct heat-treatment because of reducing the number and size of split during drying bamboo.

원통형 대나무의 균열 방지를 위한 열처리

박충년,정우양 한국가구학회 2019 한국가구학회지 Vol.30 No.3

In this study it was suggested a heat treatment of a cylindrical bamboo to prevent from cracking accompanied drying. Theoretical evaluation for the changes of the strain and the residual stress arisen from drying showed that cracking could be produced due to the difference of strains between the inner and outer surfaces and would be harder at a high temperature than at a low temperature because a plastic accommodation would be significant at a high temperature whereas it would be negligible at a low temperature. In addition, it was known that if crack was not found during cooling and very early time after heat treatment (high temperature drying) crack would not be produced thereafter. In order to conform these theoretical predictions the heat treatments of cylindrical bamboos were carried out at 200°C for 0.5~3 hours and the heat treated and the untreated were kept at 60°C to see crack formation. As the result, the heat treated bamboos were not cracked whereas all of the untreated were cracked. The changes of the artificial cracks formed after heat treatment showed that the compressive residual stress was produced by absorption of moisture from air on the outer surface of bamboo 5 days after the heat treatment.

Viability of sprout seeds as affected by treatment with aqueous chlorine dioxide and dry heat, and reduction of Escherichia coli O157:H7 and Salmonella enterica on pak choi seeds by sequential treatment with chlorine dioxide, drying, and dry heat

Choi, S.,Beuchat, L.R.,Kim, H.,Ryu, J.H. Academic Press 2016 FOOD MICROBIOLOGY Vol.54 No.-

<P>Germination rates of 11 types of sprout seeds (alfalfa, broccoli, kohlrabi, kyona, mustard, pak choi, red kohlrabi, red radish, red young radish, tatsoi, and violet radish) treated with ClO2 (200 mg/ml, 5 min) or dry-heat (80 degrees C/23% relative humidity [RH], 24 h) were determined. Pak choi, red radish, and tatsoi seeds showed highest tolerance to both ClO2 and dry-heat treatments. Next, pak choi seeds were inoculated with Escherichia coli O157:H7 (5.4 log CFU/g) or Salmonella enterica (4.8 log CFU/g) and sequentially treated with ClO2 (200 mg/ml, 5 min), drying (45 degrees C/23% RH, 24 h), and dry heat (80 degrees C/23% RH, 48 h). E. coli O157:H7 was inactivated, but S. enterica was not eliminated (>3.8 log CFU/g reduction). Pak choi seeds inoculated with the pathogens were treated with ClO2, drying, and dry heat and subsequently sprouted for 5 days. When seeds were not completely decontaminated, initial populations of E. coli O157:H7 and S. enterica on seeds (<1.0 log CFU/g) increased to >5.3 and >8.4 log CFU/g of sprouts, respectively. This study shows that sequential treatments of pak choi seeds with ClO2, drying, and dry heat are effective in reducing large numbers of E. coli O157:H7 and S. enterica without loss of seed viability. (C) 2015 Elsevier Ltd. All rights reserved.</P>

벼 유전자원의 저장수명 예측을 위한 건열처리 효과

나영왕,김석현,백형진,최유미,이석영,이정로,정종욱,박용진 한국작물학회 2014 한국작물학회지 Vol.59 No.3

The purpose of this study was to developthe cost-effective and efficiency seed longevity predictionmethod of rice (Oryza sativa L.) germplasm for viabilitymonitoring. To find an optimum predicting method for riceseed longevity at genebank, an accelerated ageing (AA)test, a controlled deterioration (CD) test and a dry-heattreatment (DHT) were conducted to the four groups of ricegermplasm based on ecotype, such as Indica, Japonica,Javanica and Tongil type. Among the three artificial agingtreatments, the dry-heat treatment of 36 hours at 90℃ issuggested as a routine predictive test method of rice germplasmlongevity at a genebank. The distribution of germination rateon 3,066 accessions which conserved 26.5 years at 4℃ showedsimilar trend with the result of distribution by dry-heattreatment at 90℃ on 36 hours using 106 accessions of riceselected samples which composed four ecotype groups. Theresults show that the dry-heat treatment affect not onlypredicting the rice seed longevity but also determining effectiveinterval for monitoring germination of rice germplasm ingenebanks

종자처리에 의한 상추 품종간 추대반응 차이

황현정 ( Hyeon Jeong Hwang ),이정명 ( Jung Myung Lee ),안종문 ( Jong Moon An ),김세영 ( Se Young Kim ),최근원 ( Geun Won Choi ) 한국환경농학회 2007 한국환경농학회지 Vol.26 No.4

A series of experiments were performed to evaluate effects of lettuce seed treatment with low temperature and dry heat treatment (DHT) on bolting response in the case of spring cultivation. During spring production in greenhouse, bolting response of the plants produced from the treated seeds was faster in the order of low temperature treatment, control and DHT. Plant height was increased 5-10 cm higher by low temperature treatment, but plant growth of some cultivars was inhibited by DHT. Difference on lettuce plant growth between low temperature treatment and DHT was gradually diminished with the lapse of time after transplanting. Fresh weight of plant was not significantly different among all treatments. ``Red Gyeolku`` showed very early bolting response and plant height was significantly promoted by low temperature treatment. However, ``Cheongchima`` showed low bolting percentage after various seed treatments, so it is considered late-bolting cultivar.

벼 유전자원의 저장수명 예측을 위한 건열처리 효과

나 영왕,백 형진,최 유미,이 석영,이 정로,정 종욱,박 용진,김 석현 한국작물학회 2014 한국작물학회지 Vol.59 No.3

The purpose of this study was to develop the cost-effective and efficiency seed longevity prediction method of rice (Oryza sativa L.) germplasm for viability monitoring. To find an optimum predicting method for rice seed longevity at genebank, an accelerated ageing (AA) test, a controlled deterioration (CD) test and a dry-heat treatment (DHT) were conducted to the four groups of rice germplasm based on ecotype, such as Indica, Japonica, Javanica and Tongil type. Among the three artificial aging treatments, the dry-heat treatment of 36 hours at 90°C is suggested as a routine predictive test method of rice germplasm longevity at a genebank. The distribution of germination rate on 3,066 accessions which conserved 26.5 years at 4°C showed similar trend with the result of distribution by dry-heat treatment at 90°C on 36 hours using 106 accessions of rice selected samples which composed four ecotype groups. The results show that the dry-heat treatment affect not only predicting the rice seed longevity but also determining effective interval for monitoring germination of rice germplasm in genebanks.

효소처리 농도 및 시간에 따른 섬쑥부쟁이 추출물의 품질 특성

김선화,윤성란,정용진 한국식품저장유통학회 2023 한국식품저장유통학회지 Vol.30 No.4

The Aster glehni extract has many therapeutic and medicinal values. Therefore, it is essential to set appropriate conditions for enzyme treatment to efficiently extract A. glehni. In this study, changes in the quality of A. glehni extract depending on the concentration and time of enzyme treatment was investigated to increase its effective utilization. Compared to the control, the pH of the extract of A. glehni its soluble solid content increased with the enzyme treatment. The color of the A. glehni extract changed from green-yellow to reddish-yellow with the increase in treatment duration. The fructose and sucrose contents of the extract were the highest at 7.73% and 6.78%, respectively, in the control group without the enzyme treatment. Glucose and maltose contents were 6.91% and 4.44% in the C group (3.2% enzyme concentration and 60 min for enzyme treatment), respectively. Total polyphenol content, which shows antioxidant activity, was the highest at 7.38 mg GAE/g in the E group (1.6% of enzyme concentration and 120 min for enzyme treatment). 2,2-diphenylpicrylhydrazyl (DPPH) and 2,2'-azino-bis (3-ethylbenzothiazoline- 6-sulfonic acid (ABTS) showed the highest radical scavenging activity in the C group (3.2% of enzyme concentration and 60 min for enzyme treatment). These results enable setting appropriate conditions of enzyme treatment in terms of enzyme concentration and time for the production of dry powders using A. glehni extract.