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 ผลงานตีพิมพ์ในวารสารวิชาการMolecular hydrogen production by a thermotolerant Rubrivivax gelatinosus using raw cassava starch as an electron donor. Science Asia. 31 (4) ผู้แต่ง: Polson Mahakhana, Chintana Chobvijuka, Mongkol Ngmjarearnwonga,  Dr.Savitree Limtong, Professor , Christopher Buckeb, Jisnuson Svastic, Dr.Werasit Sanpamongkolcha, Associate Professor , Dr.Lerluck Chitradon, Associate Professor , วารสาร: |
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Production of L-Lactic Acid from Raw Cassava Starch by Rhizopus oryzae NRRL 395) ผู้เขียน:นางสาวนวลพรรณ ณ ระนอง, Duangduan Poocharoen สื่อสิ่งพิมพ์:pdf AbstractLactic acid, which is commonly used in food, chemical and pharmaceutical industries, has recently received much attention for the production of biodegradable plastic. L-lactic acid production by Rhizopus oryzae NRRL 395 from raw cassava starch as a sole carbon source was studied. The optimum production medium was as follows (g/l) : raw cassava starch, 120; (NH4) 2 SO4, 3.0; KH2PO4, 1.0; MgSO4.7H2O, 0.25; ZnSO4.7H2O, 0.04; pH 6.0. The maximum L-lactic acid production in shake flasks was 68.32 g/l on day 5 with the shaking speed of 200 rpm at 30?C. L – lactic acid yield and productivity were 0.59 g/g substrate and 0.57 g/lh, respectively. In a jar fermentor, the maximum L-lactic acid production was 54.62 g/l on day 4 of cultivation at the agitation speed of 400 rpm and the aeration rate of 1.5 vvm. The L – lactic acid yield was 0.49 g/g substrate with the productivity of 0.56 g/lh. |
หัวเรื่อง:สภาวะที่เหมาะสมในการผลิตเอนไซม์เพคติเนสในวัสดุอาหารแข็ง โดยเชื้อรา Rhizopus sp. 26R ที่สามารถย่อยสลายแป้งมันสำปะหลังดิบ ผู้เขียน:ดร.เลอลักษณ์ จิตรดอน, รองศาสตราจารย์, พลสัณห์ มหาขันธ์, ดร.วิเชียร กิจปรีชาวนิช, รองศาสตราจารย์ , นางนภา โล่ห์ทอง, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractEleven strains of Aspergillus spp. and 3 strains of Rhizopus spp. efficient in raw cassava starch hydrolysis were also found to be good in pectinase activity. Strain selection was performed by using solid substrate fermentation composing of wheat bran and rice husk in a ratio of 18:2. It revealed that Rhizopus sp. 26R gave almost the highest activity in 2 days and remained constant for 4 days. Optimization studies showed that addition of either 1 g raw cassava starch or pectin to a 20 g substrate increased the enzyme activity to 1.7 and 2.4 times, respectively. The highest activity, however, obtained when the strain was grown on substrate containing a mixture of wheat bran, rice bran and rice husk in a ratio of 9:9:2 or 6:12:2 with 58% initial moisture content, pH adjusted to 5.7 and incubation was at 32 degree C. Under these conditions, Rhizopus sp. 26R produced ca. 700 units of enzyme activity per gram of wet weight substrate. |
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