• Food Science and Biotechnology
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• 제14권5호
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• pp.681-684
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• 2005

A maltopentaose-producing amylase (G5-amylase) from Bacillus megaterium KSM B-404 was applied to retard bread retrogradation. Retrogradation rates were determined by differential scanning calorimetry. Gel permeation chromatography determined changes in maltooligosaccharide composition and the molecular weight profiles of carbohydrate tractions. The baking process produced maltopentaose and maltotriose by the hydrolysis of starch molecules into small units. Amylose and amylopectin degradation as well as maltooligosaccharides produced by the enzyme were likely responsible for retarding starch retrogradation. Overall, addition of G5-amylase reduced the starch retrogradation rate, and was as effective as Novamyl(R), a commercial enzyme.

• KSBB Journal
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• 제16권3호
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• pp.246-252
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• 2001

We isolated a bacterium that produces an extracellular maltopentaose(G5)-forming amylase from amylose and soluble starch. The bacterium was identified and assigned as a Bacillus sp. AIR-5. The amylase did not hydrolyze maltose, maltotriose, maltotetraose or maltopentaose. Optimum medium composition for maltopentaose production in flask culture was 2%(w/v) soluble starch, 0.4%(w/v) tryptone, 0.5%(w/v) NaCl, 0.5%(w/v) K$_2$HPO$_4$, and 3 mM CaCl$_2$at pH 8.0, 28$^{\circ}C$. The highest yield for maltopentaose production in this condition was 6.45 g/L and was 32.55% of theoretical yield.

• 한국식품과학회지
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• 제26권5호
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• pp.633-637
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• 1994

퇴비에서 maltotetraose 생산성 아밀라제를 분비하는 세균 KSM-35를 분리하여 그의 형태적, 생화학적 특성을 고려하여 Steptomyces albus로 잠정 동정 하였다. 이 균주가 생산하는 아밀라제는 유안침전 분획, DEAE-Toyo pearl 및 2회의 sephadex-100 크로마토그라피로 44.5배 정제하며 27.1%의 활성을 회수할 수 있었다 이 효소의 등전점은 4.3이었으며 SDS-PAGE로 분석한 결과 분자량은 약 50,000이었다. 이 균주의 아밀라제를 2% 전분과 26시간 반응시킨 후 생성된 올리고당류를 HPLC로 조사한 결과 56%가 maltotetraose로서 주산물이었고 maltose와 maltoriose가 각각 20% 및 16%를 차지하였으며 기타 소량의 glucose, maltopentaose가 검출되었다.