高产单宁酶泡盛曲霉Aspergillus awamori FUYN206的筛选及所产胞外单宁酶的稳定性研究
2012-09-12李红歌付桂明游向荣刘成梅王振兴滕立典潘捷科王建涛王秀娟
李红歌,付桂明,*,游向荣,刘成梅,孙 健,万 茵,王振兴,滕立典,潘捷科,王建涛,胡 明,王秀娟
(1.南昌大学食品科学与技术国家重点实验室,江西南昌 330047;2.南昌大学生命科学与食品工程学院,江西南昌330047;3.南昌大学中德食品工程中心,江西南昌 330047;4.广西农业科学院农产品加工研究所,广西南宁530007;5.广西广联饲料有限公司,广西南宁 530007)
高产单宁酶泡盛曲霉Aspergillus awamori FUYN206的筛选及所产胞外单宁酶的稳定性研究
李红歌1,2,3,付桂明1,2,3,*,游向荣4,刘成梅1,2,3,孙 健4,万 茵1,2,王振兴4,滕立典5,潘捷科5,王建涛1,2,3,胡 明1,2,3,王秀娟2
(1.南昌大学食品科学与技术国家重点实验室,江西南昌 330047;2.南昌大学生命科学与食品工程学院,江西南昌330047;3.南昌大学中德食品工程中心,江西南昌 330047;4.广西农业科学院农产品加工研究所,广西南宁530007;5.广西广联饲料有限公司,广西南宁 530007)
首次从云南红茶中分离筛选到1株高产单宁酶的真菌菌株Aspergillus awamor,其在pH5.0、30℃培养72h后所产胞外单宁酶活力达162.84U/mL。酶活稳定性研究表明,该菌株所产胞外单宁酶在储存4和12周后仍保存98.02%和90.49%的酶活力;所产胞外单宁酶最适酶促反应温度为40℃,且耐高温性能优越,90℃水浴1h仍保留有88%的酶活;pH3.0~6.5范围内酶活均较稳定,酶促反应最适pH5.5;K+、Ag+、Zn2+等金属离子能促进胞外单宁酶酶促反应,而Na+、Mg2+、Ca2+、Fe2+、Fe3+、Co2+、Mn2+、Cu2+、Ba2+等金属离子在不同程度上抑制酶促反应,其中Co2+、Cu2+的抑制作用最强。
泡盛曲霉FUYN206,胞外单宁酶,高温稳定性
Abstract:One fungal strain named Aspergillus awamori FUYN206,which could produce high yield of tannin acyl hydrolase,was isolated from Yunnan Black Tea.The activity of its extracellular tannase was 162.84U/mL when the strain grown at 30℃,pH5.0 under agitation(120r/min) for 72h.And the activity of extracellular tannase from Aspergillus awamori FUYN206 was reserved 98.02%and 90.49%after stored at 4℃for four and twelve weeks respectively.The optimal reaction temperature was 40℃.Study on the stability of tannase activity that was shown the extracellular tannase had the superior stability of high-temperature.The activity of this tannase retained around 88%at 90℃ for 1h.The extracellular tannase was stable in the pH range of 3.0~6.5 and showed pH optima of 5.5.The activity of the extracellular tannase was enhanced by K+,Ag+,Zn2+.It was inhibited by Na+,Mg2+,Ca2+,Fe2+,Fe3+,Hg2+,Mn2+,Ba2+,particularly Co2+and Cu2+.
Key words:Aspergillus awamori FUYN206;extracellular tannase;stability of high-temperature
单宁酰基水解酶(EC 3.1.1.20),又称单宁酶,是催化单宁酸酯键水解和缩酚键水解的诱导酶[1]。纯单宁酶为淡黑色或白色粉末,不溶于乙醇,溶于水形成无色澄清溶液。……
