Main Article Content
Crotalatia Juncea L. (Sunn hemp) is a leguminous cover crop with multipurpose use as green manure, animal fodder crop, and plants in scenic spots for tourism. Additionally, Sunn hemp could also be used in human foods with its pharmacological effect. This research aimed to study the effect of pan-roasting time and air-drying temperature on physicochemical properties, antioxidant activity, total phenolic and tannin contents of Sunn hemp tea products. The samples of young leaves (50-60 days), and flowers (50-60 days) were pan-roasted at 60 ºC for 10 and 15 min and air-dried at 80 and 90 ºC for 3 hrs. The results showed that the moisture content of Sunn hemp leaves and flowers were significantly decreased (p ≤ 0.05) with increasing both roasting time and drying temperature. The moisture contents of the leaves and flowers were 4.45-7.62 and 5.59-7.73 %, respectively. The L* values of Sunn hemp tea powder and beverage were significantly decreased (p ≤ 0.05) while a* values were significantly increased (p ≤ 0.05) with increasing the roasting time and drying temperature. The results demonstrated that the total phenolic and tannin contents and antioxidant activity of tea beverage from both parts of Sunn hemp were significantly increased (p ≤ 0.05) with increasing the roasting time and drying temperature. Moreover, the total phenolic and tannin contents and antioxidant activity of tea beverage from young leaves were significantly higher (p ≤ 0.05) than those of tea beverage from flowers. The antioxidant activity of tea beverage from Sunn hemp flowers and young leaves were shown in the range of 49.40-56.39, and 58.53-72.41 mg Trolox/100 mL sample, respectively.
Sheahan, C.M., 2012, Plant Guide for Sunn Hemp (Crotalaria juncea), USDA-Natural Resources Conservation Service, Cape May Plant Materials Center, Cape May, NJ.
Leuanglawan, P. and Sooksombut, W., 2015, Utilization of Sunnhemp Meal in Beef Cattle Diet, Research report, Department of animal Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, 48 p. (in Thai)
Heuzé, V., Thiollet, H., Tran, G. and Lebas, F., 2018, Sunn Hemp (Crotalaria juncea), Feedipedia, A Programme by INRA, CIRAD, AFZ & FAO, Available Source: https://www.feedipedia.org/node/313, May 1, 2020.
Chouhan, H.S. and Singh, S.K., 2010, Antibacterial activity of seed and flower parts of Crotalaria juncea Linn, Am. Euras. J. Sci. Res. 5: 212-215.
Al-Snafi, A.E., 2016, The contents and pharmacology of Crotalaria juncea – A review, IOSR J. Pharm. 6: 77- 86.
Pourmorad, F., Hosseinimehr, S.J. and Shahabimajd, N., 2006, Antioxidant activity, phenol and flavonoid contents of some selected Iranian medicinal plants, Afr. J. Biotechnol. 5: 1142-1145.
Sharma, G.N., Dubey, S.K., Sati, N. and Sanadya, J., 2011, Anti-inflammatory activity and total phavonoid content of Aegle marmelos seeds, Int. J. Pharm. Sci. Drug Res. 3: 214-218.
Sakulpanich, A. and Grissanapan, W., 2008, Extraction method for high content of anthraquinones from Cassia fistula pods, J. Health Res. 22: 167-172.
Ghasemzadeh, A., Jaafar, H.Z.E. and Rahmat, A., 2010, Antioxidant activities, total phenolics and flavonoids content in two varieties of Malaysia young ginger (Zingiber officianle Roscoe), Molecules 15: 4324-4333.
Pham-Huy, L.A., He, H. and Pham-Huy, D., 2008, Free radicals, antioxidants in disease and heath, Int. J. Biomed. Sci. 4: 89-96.
AOAC, 2000, Official Methods of Analysis of the Association of Official Analytical Chemists 925.19 Moisture in Tea, 17th Ed., Association of Official Analytical Chemists, Washington DC.
Hou, W.C., Lin, R.D., Cheng, K.T., Hung, Y.T., Cho, C.H., Chen, C.H., Hwang, S.Y. and Lee, M.H., 2003, Freeradical – Scavenging activity of Taiwanese native plant, Phytomedicine 10: 170-175.
Hutadilok-Towatana, N., Chaiyamutti, P., Panthong, K., Mahabusarakam, W. and Rukachaisirikul, V., 2006, Antioxidative and free radical scavenging activities of some plants used in Thai folk medicine, Pharm. Biol. 44: 221-228.
Jirarattanarangsri, W. and Budprom, P., 2017, Effect of different processing on phenolic content, anthocyanin content, antioxidant capacity and consumer acceptance of black glutineous rice leaf tea, J. Srinakharinwirot Univ. (J. Sci. Technol.) 9(17): 91-103. (in Thai)
Thai Industrial Standards Institute, 2015, Community Product Standards: Tea (120/2558), Available Source: https:// www.tisi.go.th, May 14, 2020. (in Thai)
Phosee, N., Khongbutr, P., Uttamating K., and Assawarachan, R., 2013, Effect of tempera ture on moisture ratio and color changes of mint leaves during hot air drying process, RMUTSB Acad. J. 1(2): 103-114. (in Thai)
Siritrakulsak, P. and Simla, S., 2015, Effects of conventional cooking method on antioxidant content in Moonflowe, Khon Kaen Agric. J. 43(Suppl. 1): 875-880. (in Thai)
Buasod, P., 2006, Antioxidant Capacity Test of Tea Beverages by Cyclic Voltametry, Master’ s Thesis, Silpakorn University, Nakornpathom, 228 p.
Khonsarn, N., Chaiyabot, A., Naparat Chairak, N. and Lawan, S., 2018, Effect of drying on total phenolic contents and antioxidant activities in herbal infusions, Khon Kaen Agric. J. 46(Suppl. 1): 1395-1400. (in Thai)
Hajimehdipoor, H., Adib, N., Khanavi, M., Mobli, M., Amin, G.R. and Hamzeloo Moghadam, M., 2012, Comparative study on the effect of different methods of drying on phenolic content and antioxidant activity of some edible plant, IJPSR 3: 3712-3716.
Muangrat, R., Tomtong, P. and Luangpan, J., 2016, Total phenolic compounds extraction from Kluai Hom Thong peels using subcritical solvent extraction technique, J. Srinakharinwirot Univ. (J. Sci. Technol.) 8(15): 54-65. (in Thai)
Caro, D.A., Piga, A., Pinna, I., Fenu, P.M. and Agabbio, M., 2004, Effect of drying conditions and storage period on polyphenolic content, antioxidant capacity, and ascorbic acid of prunes, J. Agri. Food Chem. 52: 4780-4784.
Muadiad, K., Bunkrongcheap, R. and Petlamul, W., 2019, Effect of pan firing and drying on total phenolic contents, tannin and antioxidant activity from Crotalatia Juncea L. tea product, p. 373, Proceeding 29th SRU National Conference: Research and Innovation for Sustainability Development, Surat Thani. (in Thai)
Sintupiboonkit, C., Klanvaree, N., Sreewisanjaras, T., Datchkhun, C. and Chanchamchoi, P., 2015, The antioxidant activities in infusions and ready-to-drink herbal teas, pp. 165-172, The 6th Academic Meeting and National and International Conference: Meeting Abstract of Science Technology, Surat Thani. (in Thai)