• 제목/요약/키워드: Hot water pretreatment

검색결과 57건 처리시간 0.025초

Pretreatments of Softwood Sawdust for Mycelial Growth of Lentinus edodes

  • Kim, Tae-Hong;Lim, Bu-Kug;Chang, Jun-Pok;Yoon, Kab-Hee;Lee, Jong-Yoon;Yang, Jae-Kyung
    • Journal of the Korean Wood Science and Technology
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    • 제30권3호
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    • pp.109-115
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    • 2002
  • Mycelial growth of L. edodes by pretreatments of softwood was studied on a sawdust medium. The sawdust used was from the following softwood species : Larix leptolepis, Pinus densiflora and Pinus koraiensis. The pretreatment consisted of cold-water (48 h), hot-water (3 h) and steam extractions (3 h) at a ratio of 500 g : 3,000 mL (sawdust : distilled water). The sawdust medium was a mixture of 76% sawdust, 20% rice bran, 3% glucose, 0.4% potassium nitrate and 0.6% calcium carbonate. Following sawdust pretreatments proved most suitable : L. leptolepis (steam extraction), P. densiflora (hot-water extraction) and P. koraiensis (hot-water extraction). Mycelial growth on P. koraiensis sawdust increased in proportion to an increase in hot-water extraction time. Mycelial growth was optimum on the sawdust extracted for 12 hours, hot-water extraction beyond this period proved unsuitable. With the exception of P. densiflora at 100 ㎍/mL, antifungal activity occurred in every sample. Maximum inhibition of mycelial growth was obtained from following concentration of hot-water extractives : P. densiflora (104 ㎍/mL) and P. koraiensis (104 ㎍/mL). This study has provided useful preliminary information for the cultivation of L. edodes.

PTT 섬유의 염색성 (2) - 용제 처리한 PTT 섬유의 염색성 및 물성 - (Dyeing Properties of PTT Fiber (2) - Effect of Solvent Treatment on Dyeing and Physical Properties of PTT Fiber -)

  • 이두환;정동석;김호정;이문철
    • 한국염색가공학회지
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    • 제15권4호
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    • pp.8-16
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    • 2003
  • Poly(trimethylene terephthalate)(PTT) fiber was pretreated with organic solvent/water solution of various compositions. The organic solvents used in this experiment were benzyl alcohol, n-buthanol, and N,N-dimethylformamide(DMF). Density of the fibers were investigated as a measure of crystallite region. The dye uptake increased in the order of pretreatment with hot water < untreated < 5% benzyl alcohol < 100% benzyl alcohol < 90% benzyl alcohol; hot water < untreated $\risingdotseq$ 5% butanol < 100% beutanol < 90% butanol; hot water $\risingdotseq$ 5% DMF < untreated < 90% DMF < 100% DMF. The dye uptake increases with increase of crystallinity. It seems likely that the recrystallization process during the pretreatment with organic solvent/water solutions leads to an increase in the microvoid and then a large increase in the dye uptake. Also the dyeing rate increased and the dyeing transition temperature decreased with the pretreatments. The results obtained are corresponds with the plasticization of the fiber structure formed during the pretreatrnent.

열수전처리를 이용한 탈지미세조류로부터 발효당 생산 공정 개발 (Production of Fermentable Sugar from Lipid Extracted Algae using Hot Water Pretreatment)

  • 이지현;신슬기;최강훈;조재민;김진우
    • Korean Chemical Engineering Research
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    • 제54권4호
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    • pp.443-447
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    • 2016
  • 미세조류 세포벽은 셀룰로오스가 주요 구성성분으로 리그닌을 포함하지 않아 낮은 온도의 전처리 조건에서도 효과적으로 셀룰로오스와 헤미셀룰로오스 분해가 가능하다. 차세대 바이오매스로 주목 받는 미세조류(Tetraselmis KCTC 12236BP)로부터 $120^{\circ}C$ 이하의 낮은 온도 조건에서 열수전처리를 이용한 발효당 생산 증대를 위해 공정조건을 최적화하였다. 주요 공정조건인 추출온도, 황산농도와 추출시간에 따른 당화율 변화를 확인하였을 때, 온도와 황산농도가 글루코오스 생산에 큰 영향을 컸으며 당화율이 비례하여 증가하는 경향을 보였다. 경제성을 고려한 열수전처리 최적조건은 $120^{\circ}C$, 2 mol 황산, 40분으로 95.9%의 당화율을 얻을 수 있었다. 탈지미세조류의 황산 열수전처리와 효소당화를 비교했을 때, 황산 열수전처리의 당화율이 2.1배 이상 높고 전처리 시간이 짧아 황산 열수전처리가 효소당화에 비해 효과적인 공정임을 확인하였다.

Effect of Biological and Liquid Hot Water Pretreatments on Ethanol Yield from Mengkuang (Pandanus artocarpus Griff)

  • Yanti, Hikma;Syafii, Wasrin;Wistara, Nyoman J;Febrianto, Fauzi;Kim, Nam Hun
    • Journal of the Korean Wood Science and Technology
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    • 제47권2호
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    • pp.145-162
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    • 2019
  • This study aimed to increase the sugar and ethanol yield from the mengkuang plant biomass through biological and liquid hot water (LHW) pretreatment and their combination. The results showed that biological pretreatments with 5% inoculum of the fungus Trametes versicolor resulted in the highest alpha cellulose content incubated for 30 days, and 10% inoculum resulted in the lowest lignin content. LHW pretreatment decreased the hemicellulose content of pulps from 10.17% to 9.99%. T. versicolor altered the structure of the mengkuang pulp by degrading the lignin and lignocellulose matrix. The resulting delignification and cellulose degradation facilitate the hydrolysis of cellulose into sugars. The alpha cellulose content after biological-LHW pretreatment was higher (78.99%) compared to LHW-biological pretreatment (76.85%). Scanning electron microscopy analysis showed that biological-LHW combinated treatment degrades the cell wall structures. The ethanol yield for biological-LHW pretreated sample was observed 43.86% (13.11 g/L ethanol by weight of the substrate, which is much higher than that of LHW-biological pretreatment (34.02%; 9.097 g/L). The highest reducing sugar content about 45.10% was observed with a resulting ethanol content of 15.5 g/L at LHW pretreatment temperature of $180^{\circ}C$ for 30 min.

Anaerobic Fermentation of Woody Biomass Treated by Various Methods

  • Nakamura, Yoshitoshi;Mtui, Godliving
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제8권3호
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    • pp.179-182
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    • 2003
  • Anaerobic fermentation was attempted to produce methane from the wood chip (Eucalyptus globulus). By the pretreatment of the wood chip using hot water with high temperature, NaOH, and steam explosion, the production of methane gas was enhanced. The pretreatment using Steam explosion resulted in more amount of methane gas produced than the treatment using either hot water or 1% (w/w) NaOH with high temperature, and the steam explosion at a steam pressure of 25 atm and a steaming time of 3 min was the most effective for the methane production. The amount of methane gas produced depended on the ratio of weight of Klason lignin, a high molecular weight lignin, in the treated wood chip.

Development of Oriented Strand Board from Acacia Wood (Acacia mangium Willd): Effect of Pretreatment of Strand and Adhesive Content on the Physical and Mechanical Properties of OSB

  • Febrianto, Fauzi;Royama, Lincah Ida;Hidayat, Wahyu;Bakar, Edi S.;Kwon, Jin-Heon;Kim, Nam-Hun
    • Journal of the Korean Wood Science and Technology
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    • 제37권2호
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    • pp.121-127
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    • 2009
  • Acacia wood (Acacia mangium Willd.) is the most popular fast growing tree species planted in timber estate in Indonesia and is considered to be very valuable raw materials for structural composite products. The objective of the research was to evaluate the properties of OSB prepared from A. Mangium wood with or without immersing the strands to hot water at $80^{\circ}C$ for 2 hours. MDI adhesive was used in 3 levels i.e., 3%, 5%, and 7%. The moisture content of strand was 7%. The results indicated that immersing strands in hot water for 2 hours at $80^{\circ}C$ prior to manufacture OSB improved significantly the mechanical peoperties (i.e., MOR and MOE) of OSB. The higher the adhesive content resulted in the better the dimensional stabilisation (i.e., water absorption and thickness swelling) and the mechanical properties (i.e., MOR, MOE and IB) of OSB. OSB prepared from hot-water immersed strands with 5% adhesive content has met all parameters requirement on the JIS A 5908 (2003) standard.

전처리방법(前處理方法)의 변화(變化)에 따라 제작(製作)된 전기로(電氣爐)슬래그콘크리트의 특성(特性) 연구(硏究) (A Study on the Characteristics of Electric Arc Furnace Slag Concrete According to the Changing of the Pretreatment Method)

  • 김남욱;전준홍;배주성
    • 자원리싸이클링
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    • 제18권4호
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    • pp.52-61
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    • 2009
  • 본 연구의 목적은 기존 전처리 방법과 본 연구에서 도출한 표면처리 방법으로 전처리한 전기로슬래그의 물성을 분석하고 전처리 방법을 달리한 각각의 전기로슬래그의 대체율을 변화시켜 제작한 콘크리트의 특성을 비교 고찰하여 산업부산물인 전기로슬래그를 콘크리트용 굵은골재의 대체재로 활용하는데 있다. 한편, 표면처리 방법은 무기계의 실리카 용액을 사용하여 1일 함침 후 6시간 자연 건조하는 방법을 이용하였는데, 결과로부터, 기존의 온수처리방법에 비해 본 연구에서 사용한 표면처리방법이 더욱 효과적이었으며, 표면처리방법이 전기로슬래그의 팽창성 감소와 콘크리트용 굵은 골재로 활용하는데 효과적이라고 판단된다.

Optimization and Pretreatment for Hot Water Extraction of Korean Deer (Cervus canadensis Erxleben) Velvet Antlers

  • Jang, Dong Wook;Ameer, Kashif;Oh, Jun-Hyun;Park, Mi-Kyung
    • Journal of Microbiology and Biotechnology
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    • 제30권8호
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    • pp.1116-1123
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    • 2020
  • Velvet antler (VA) is a historically traditional medicinal supplement and is well known in Asian countries for its pharmaceutical and health benefits. The objectives for this study were to optimize the hot water extraction (HWE) of VA for the Korean VA industry, and to determine the most effective pretreatment method among microwave (MW), ultrasonication (US), and enzymatic (EZ) techniques. Using response surface methodology, optimum extraction temperatures and times were determined by central composite design configuration based on extraction yield and sialic acid content. Various quality parameters of VA extract including yield, soluble solid, protein, and sialic acid contents were also compared with the conjunction of HWE and pretreatment. The yield and sialic acid content of VA extract were determined to be 40% and 0.73 mg/g, respectively, under an optimum temperature of 100℃ at 24 h of extraction time. The yields from VA extracts pretreated with MW, US, and EZ were 17.42%, 19.73%, and 29.15%, respectively. Among the tested commercial enzymes, pepsin was the most effective proteolytic enzyme and led to the highest yield (47.65%), soluble solids (4.03 °brix), protein (1.12 mg/ml), and sialic acid (3.04 mg/ml) contents from VA extract.

추출 용매 및 효소 전처리 방법에 따른 포피란과 헤미셀루로오즈의 특성 (Properties of Porphyran and Hemicellulose extracted with Different extract Solutions and Enzymatic Pretreatments from Porphyra)

  • 안세라;구재근
    • 수산해양교육연구
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    • 제29권1호
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    • pp.108-117
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    • 2017
  • 김은 우리의 주요한 식품 자원으로 단백질 함량과 탄수화물의 함량이 매우 높다. 김에는 다량의 단백질과 탄수화물이 존재한다. 특히 탄수화물에는 isofloridoside과 floridoside 등의 유리당 뿐 아니라 3,6-anhydro-L-galactose와 ester sulfate 등을 함유한 porphyran과 xylose, mannose로 이루어진 hemicellulose가 함유되어있다. 본 연구에서는 추출 방법에 따른 porphyran과 hemicellulose의 추출, 분리 조건을 검토하기 위해 열수, 묽은 산, 알칼리로 추출한 추출물의 특성을 조사하였다. 수율은 열수 추출이 가장 높았고, 총당 함량은 묽은 산 추출이, 단백질 함량은 알칼리 추출이 가장 높아 열수와 묽은 산 추출에 의해 수용성 다당인 포피란이 효율적으로 추출되었으며 묽은 산으로 추출시 단백질의 함량이 적었다. 알칼리 추출 조건에서는 포피란의 추출이 적었으나 단백질이 다량 동시에 추출되었고 mannan은 추출되나 xylan은 추출되지 않았다. 효소 가수분해(Protamex, Flavourzyme, Alcalase, Viscozyme) 후 열수 추출한 수용성 다당의 수율은 효소 처리 시료가 34.3-39.1%로 효소 처리하지 않은 대조구에 비해 증가하였고 Flavourzyme 가수분해가 단백질 제거에 가장 효과적이었다. 또한 효소 처리한 수용성 다당의 점도가 저하하였고 의가소성 유체 특성을 나타내었다. 효소 처리 후 열수 추출하고 남은 잔사를 알칼리 추출한 경우 mannan의 함량은 protease인 효소 처리 시료가 Viscozyme 처리한 시료에 비하여 높았다. 반면에 Viscozyme 처리 후 알칼리 추출한 경우는 xylose의 추출 함량이 증가하였다.

마이크로파, 초음파 및 볶음 전처리가 오가피의 열수 추출특성에 미치는 영향 (Effects of Microwave, Ultrasound and Roasting Pretreatments on Hot Water Extraction of Acanthopanax senticosus)

  • 정헌식;윤광섭
    • 한국식품저장유통학회지
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    • 제12권2호
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    • pp.146-150
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    • 2005
  • 오가피(Acanthopanax senticosus)로부터 영양 및 기능성 성분의 열수추출 수율을 증대시킬 수 있는 방법을 개발하기 위하여 추출 전처리 및 방법의 효과를 검토하였다. 오가피를 분쇄, 체질$(8\~20\;mesh)$하고 초음파(20 kHz), 마이크로파 (2,450 MHz) 또는 볶음$(180^{\circ}C)$ 처리를 10분 동안 실시한 후 물을 용매로 상압$(100^{\circ}C)$ 추출과 가압$(121^{\circ}C)$ 추출을 각각 2시간 동안 실시하였다. 전반적으로 전처리는 성분들의 추출수율과 유리기 소거능을 증가 시키는 경향을 보였다. 특히, 가용성 고형물, 총당 및 페놀성 물질의 추출수율은 마이크로파와 초음파에 의해, 단백질의 추출수율과 유리기 소거능은 볶음처리에 의해 더욱 증가됨을 보였다. 상압추출보다 가압추출에 의해 가용성 고형물, 총당, 단백질 및 페놀성 물질의 추출수율이 증대되는 경향을 보였다. 이로써 초음파, 마이크로파 및 볶음 전처리 및 가압추출은 오가피의 추출효율 향상에 유효한 방법인 것으로 판단된다.