电子束辐照对天麻粉灭菌效果及品质的影响

为研究电子束辐照对天麻灭菌效果及其品质的影响,采用0(CK)、5、7、9、11、13 kGy剂量的电子束辐照处理天麻粉,测定天麻的微生物含量、色泽、理化性质、指纹图谱相似度及活性成分含量等指标。结果表明,经9 kGy辐照处理后,天麻中均未检出需氧菌、霉菌和酵母菌;辐照后天麻的L^*值降低,9 kGy剂量总色差值变化最小;辐照对天麻的水分、总灰分含量均无显著影响,9~13 kGy吸收剂量下天麻的醇溶性浸出物含量显著增加(P<0.05);不同吸收剂量电子束辐照处理后天麻指纹图谱的相似度为0.995~0.998;辐照对天麻主要活性成分的总含量无显著影响(P>0.05)。综上,9 kGy电子束辐照处理既能减少天麻微生物含量,又能最大限度地保持其品质不受影响。本研究结果为电子束辐照在天麻灭菌工艺中的应用提供了理论基础。

Effects of Electron Beam Irradiation on Sterilization and Quality of Gastrodia rhizoma Powder

To investigate the effects of electron beam irradiation on the sterilization and quality of Gastrodia rhizoma, Gastrodia rhizoma powder was irradiated at the doses of 0 (CK), 5, 7, 9, 11 and 13 kGy, the microbial populations, color, physicochemical, HPLC (high performance liquid chramatography) fingerprint similarity and bioactive components were measured. The results showed that the aerobic bacteria, molds and yeasts in the Gastrodia rhizoma were not detected with 9 kGy irradiation. The L^* value was decreased by irradiation, and the total color difference reached the lowest value under 9 kGy. Electron beam irradiation had no significant effect on the moisture and total ash, but the content of alcohol-soluble extracts of Gastrodia rhizoma increased significantly under 9~13 kGy (P<0.05). The similarity of Gastrodia rhizoma fingerprints under the different doses was 0.995~0.998. Irradiation had no significant effect on the total content of the main active components of Gastrodia rhizoma (P>0.05). Overall, electron beam irradiation at 9 kGy can both reduce the microbial populations and maintain the quality of Gastrodia rhizoma, Gastrodia rhizoma powder, which facilitates the application of electron beam irradiation in Gastrodia rhizoma sterilization process.