scholarly journals Aplikasi Mordan Tanin pada Pewarnaan Kain Batik Katun Menggunakan Warna Alam Tingi (Ceriops tagal)

2020 ◽  
Vol 14 (2) ◽  
pp. 128
Author(s):  
Dwi Wiji Lestari ◽  
Vivin Atika ◽  
Yudi Satria ◽  
Aprilia Fitriani ◽  
Tri Susanto
Keyword(s):  
Quantitative Analysis ◽  
Coffea Arabica ◽  
Psidium Guajava ◽  
Natural Dye ◽  
Bark Extract ◽  
Color Intensity ◽  
Standard Solution ◽  
Ceriops Tagal ◽  
Natural Mordant ◽  
Guava Leaves

The aim of the study was to evaluate the performance of tannin mordant from Psidium guajava leaves, Peltophorum pterocarpum bark, and Coffea arabica leaves in cotton batik dyeing using tingi bark (Ceriops tagal). This research was conducted by initial quantitative analysis of each extract to measure the quantity of tannin using UV-Vis spectrophotometry with tannic acid as a standard solution. The next process was a fabric pre-mordanting using each mordant extract, batik process, coloring with tingi bark extract, and post-mordanting using each alum solution and guava leaves extract. The dyed batik fabric was tested toward its color intensity and durability/fastness properties. From the quantitative analysis, guava leaves extract contains the biggest tannin content compared with jambal bark and coffee leaves extract, which is 1151.5 μg/mL. The dyed sample from combination of Guava leaves extract pre-mordanting with alum post-mordanting provided the best color intensity of 15.52. While all variables had an equal good value for washing fastness. It can be concluded that all material had potential as natural mordant for cotton batik dyeing with natural dye, but with consideration of using metal mordant for combination to get better results in terms of both color intensity and fastness properties.Keywords: batik; biomordant; natural dye; tannin mordant A B S T R A KTujuan dari penelitian ini adalah untuk mengetahui kinerja mordan tanin dari daun jambu biji (Psidium guajava), kulit kayu jambal (Peltophorum pterocarpum) dan daun kopi (Coffea arabica) dalam pewarnaan kain batik katun dengan pewarna alami tingi (Ceriops tagal). Penelitian dilakukan dengan terlebih dahulu mengukur kadar tanin total dari masing-masing ekstrak secara kuantitatif menggunakan spektrofotometri UV-Vis dengan larutan standar asam tanat. Proses selanjutnya adalah mordan awal kain menggunakan masing-masing ekstrak mordan, pembatikan, pewarnaan menggunakan ekstrak kulit kayu tingi, dan mordan akhir menggunakan masing-masing larutan tawas dan ekstrak daun jambu biji. Kain batik berwarna diuji ketuaan warna dan ketahanan luntur warnanya. Dari hasil analisis kuantitatif, didapatkan kandungan tanin terbesar dari ekstrak daun jambu biji yaitu 1.151,5 μg/mL. Hasil uji ketuaan warna paling besar didapatkan dari perlakuan mordan awal daun jambu biji dan mordan akhir tawas dengan nilai 15,52, sedangkan ketahanan luntur warna terhadap pencucian secara rata-rata memberikan nilai 4 (baik) untuk semua variabel. Kesimpulan yang dapat diambil yaitu ekstrak daun jambu biji, kulit kayu jambal, dan daun kopi memiliki potensi untuk digunakan sebagai bahan mordan pada pewarnaan batik. Penggunaan ketiga bahan mordan alami memerlukan kehadiran mordan logam untuk memperkuat intensitas warna dan ketahanan luntur warna kain.Kata kunci: batik; biomordan; mordan tannin; pewarna alam

scholarly journals Study to find the best extraction solvent for use with guava leaves ( Psidium guajava L.) for high antioxidant efficacy

2014 ◽  
Vol 2 (2) ◽  
pp. 174-180 ◽  
Author(s):  
Jongkwon Seo ◽  
Soojung Lee ◽  
Marcus L. Elam ◽  
Sarah A. Johnson ◽  
Jonghoon Kang ◽  
...  
Keyword(s):  
Psidium Guajava ◽  
Extraction Solvent ◽  
Guava Leaves

scholarly journals Diversity of Neopestalotiopsis and Pestalotiopsis spp., Causal Agents of Guava Scab in Colombia

Plant Disease ◽  
2018 ◽  
Vol 102 (1) ◽  
pp. 49-59 ◽  
Author(s):  
Fernando Solarte ◽  
Carlos German Muñoz ◽  
Sajeewa S. N. Maharachchikumbura ◽  
Elizabeth Álvarez
Keyword(s):  
Central America ◽  
Internal Transcribed Spacer ◽  
Geographical Origin ◽  
Elongation Factor ◽  
Psidium Guajava ◽  
Economic Importance ◽  
Fruit Tree ◽  
Multiple Gene ◽  
Guava Leaves ◽  
Β Tubulin

Common guava (Psidium guajava L.) is a fruit tree of global economic importance. It is grown in Asia, South and Central America, and Hawaii for its exquisite aroma and flavor, and nutritional and medical properties. However, guava production is limited by guava scab, caused by fungi in the Pestalotiopsis genus. Characteristic symptoms of guava scab are corky, ovoid or round lesions on fruit surfaces. These lesions may thicken, affecting the flesh below and reducing fruit quality and commercial value. We characterized 81 isolates isolated from guava scab lesions on guava leaves and fruit in different regions of Colombia, and identified them as Pestalotiopsis and Neopestalotiopsis spp. We analyzed the morphology, pathogenicity, and genetic diversity of the isolates based on the sequences of the internal transcribed spacer, β-tubulin, and elongation factor genes. Isolates were morphologically, pathogenically, and genetically diverse but the diversity did not correlate with geographical origin, or guava cultivar or tissue from which the isolates were recovered. Selected monosporic isolates included in the multiple-gene analysis were identified as belonging to two genera: Neopestalotiopsis (65 isolates with versicolorous conidia) and Pestalotiopsis (4 isolates with concolorous conidia).

scholarly journals EFEKTIVITAS INFUSA DAUN JAMBU BIJI (Psidium guajava) SEBAGAI PRESERVATIF ALAMI PADA KARKAS PUYUH

2021 ◽  
Vol 46 (2) ◽  
pp. 127
Author(s):  
Eulis Tanti Marlina ◽  
Ellin Harlia ◽  
Yuli Astuti Hidayati ◽  
Deden Zamzam Badruzzaman ◽  
Wowon Juanda
Keyword(s):  
Shelf Life ◽  
Experimental Method ◽  
Psidium Guajava ◽  
Antimicrobial Compounds ◽  
Natural Preservative ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Guava Leaves ◽  
Total Bacteria

Guava leaves can be used as a natural preservative in quail carcass because they contain antimicrobial compounds such as flavonoid and tannin. This study studied the effect of using guava leaves infusion on quail carcass on the total bacteria, Enterobacteriaceae, and early spoilage.  The research used an experimental method with a completely randomized design, 3 treatments of guava leaves infusion concentration, namely P1 = 25%, P2 = 50%. And P3 = 75%, each treatment was repeated 6 times.  The application of infusion to quail carcass was carried out by immersion for 15 minutes.  Data were analyzed using ANOVA and Turkey’s test.  The results showed that the total bacteria and Enterobacteriaceae before immersion were 3.80 x 107 cfu/g and 1.90 x 104 cfu/g, respectively.  Soaking quail carcass in guava leaves infusion was able to reduce the total bacteria and Enterobacteriaceae to 72.15% and 78.50%, respectively.  The early spoilage was inversely proportional to the total bacteria and Enterobacteriaceae resulted in longer shelf life.

scholarly journals A SIMPLE SPECTROPHOTOMETRIC METHOD FOR THE QUANTITATIVE ANALYSIS OF PHOSPHATE IN THE WATER SAMPLES

2018 ◽  
Vol 7 (2) ◽  
pp. 198
Author(s):  
Nur Habibah ◽  
I Gusti Ayu Shri Dhyanaputri ◽  
I Wayan Karta ◽  
Cokorda Dewi Widhya Hana Sundari ◽  
Mochammad Choirul Hadi
Keyword(s):  
Quantitative Analysis ◽  
Spectrophotometric Method ◽  
Water Samples ◽  
Calibration Graph ◽  
Ammonium Molybdate ◽  
Official Method ◽  
Phosphate Content ◽  
Color Intensity ◽  
Molybdenum Blue ◽  
Sulfuric Acid Medium

A simple spectrophotometric method was used to determine the phosphate content in the water sampels. The method is based on the formation of molybdenum blue complex from the reaction of orthophosphate and ammonium molybdate followed by reduction with ascorbic acid in the aqueous sulfuric acid medium. The color intensity of the molybdenum blue complex is proportionally to the phosphate content in the solution. The system obeys Lamber-Beer’s Law at the 890 nm in the concentration range of 0.1-1 mg P/L and the linier calibration graph was obtained with the slope, 0.6334, intercept, 0.0074 and correlation coefficient of 0.9988. This official method was also used for the quantitative analysis of phosphate in the water samples and the satisfactory result was obtained. The range of phosphate concentration in the water samples are 0.033 – 2.943 mg P/L.

The Potential of Quercetin in Psidium guajava L. Leaves Extract as Bioinhibitor for Controlled Released Fertilizer

2014 ◽  
Vol 970 ◽  
pp. 16-19
Author(s):  
Nur Kamila Ramli ◽  
Zahid Majeed ◽  
Anis Shuib ◽  
Nurlidia Mansor ◽  
Zakaria Man
Keyword(s):  
Natural Products ◽  
Ammonia Concentration ◽  
Psidium Guajava ◽  
Fertilizer Application ◽  
Small Reduction ◽  
Anti Cancer ◽  
Anti Oxidant ◽  
Urease Inhibitory ◽  
Guava Leaves ◽  
Controlled Released

This study was done to investigates the usage of natural products as one of the materials in fertilizer application. Urease inhibitors that are commonly used in agriculture are usually chemical based which affects the environment. Introducing natural products will ensure biodegradability of the material. Psidium Guajava L. (guava) has been reported to have properties such as antibacterial, anti-oxidant, anti-cancer, and anti ulcer for medical purposes. Guava leaves extract contains an active compound named quercetin that was successfully reported to exhibit significant urease inhibitory activities. Spectrophotometric method was used in this study with the theory of Beers Law in order to measure the changes in ammonia concentration. Small reduction of ammonia (NH3) concentration with different about 0.1 mol/L was calculated and the releasing was almost equal till the end of incubation time. The guava leaves extract prepared showed the potential to reduce the release of NH3 concentration during urea application.

scholarly journals Chemical composition of the essential oil of Psidium guajava leaves and its toxicity against Sclerotinia sclerotiorum

2018 ◽  
Vol 39 (2) ◽  
pp. 865
Author(s):  
Elizabeth Aparecida Josefi Silva ◽  
Vanessa Paula da Silva ◽  
Cassia Cristina Fernandes Alves ◽  
José Milton Alves ◽  
Edson Luiz Souchie ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Chemical Composition ◽  
Essential Oil ◽  
Sclerotinia Sclerotiorum ◽  
Psidium Guajava ◽  
Gas Chromatography Mass Spectrometry ◽  
Flame Ionization ◽  
Randomized Design ◽  
Dry Seasons ◽  
Guava Leaves

Globally, the fungus Sclerotinia sclerotiorum is considered as one of the most important phytopathogens, since it affects the production of several economically important crops. Further, it is difficult to control, thus increasing the use of pesticides. Therefore, the search for new substances, especially those extracted from plants, has received special attention to control this plant pathogen. The objective of the present study was to evaluate the yield and chemical composition of the essential oil extracted from the fresh leaves of guava collected during the rainy and dry seasons, and also to evaluate its toxicity against S. sclerotiorum. The experiment was a completely randomized design with five treatments and six replicates. The essential oil was extracted by hydrodistillation of the leaves and analyzed by gas chromatography-flame ionization detector and gas chromatography-mass spectrometry. The main compounds identified in the essential oil were trans-caryophyllene and ?-humulene. The essential oil at a concentration of 300 ?L exhibited 90% inhibition of the mycelial growth of S. sclerotiorum. This confirmed the antifungal potential of the essential oil of the guava leaves during both the sampling seasons.

scholarly journals Comparative evaluation of antimicrobial efficacy of an alternative natural agent for disinfection of toothbrushes

2017 ◽  
Vol 11 (01) ◽  
pp. 111-116
Author(s):  
R. Vignesh ◽  
C. Vishnu Rekha ◽  
Parisa Norouzi Baghkomeh ◽  
Sankar Annamalai ◽  
Ditto Sharmin
Keyword(s):  
Lactobacillus Acidophilus ◽  
Comparative Evaluation ◽  
Psidium Guajava ◽  
Control Group ◽  
Microbial Culture ◽  
Aqueous Extracts ◽  
Colony Forming Unit ◽  
Evaluation Group ◽  
Guava Leaves ◽  
Natural Agent

ABSTRACT Objective:The aim of this study was to assess the antimicrobial potency of aqueous extract of Psidium guajava leaves in two different concentrations as a toothbrush disinfectant against three oral bacterial species.Materials and Methods: Aqueous extracts of P. guajava leaves were prepared at 20% and 30% concentrations and 0.2% chlorhexidine was used as control. The toothbrushes were equally divided into 9 groups with 10 toothbrushes per disinfectant, which were contaminated with Streptococcus mutans, Lactobacillus acidophilus, and Enterococcus faecalis. Microbial culture was done after 5 min and 3 h of decontamination.Results: Group Ia and Ib showed that the presence of E. faecalis was observed in 8 (40%) of 20 toothbrushes. Group IIa and IIb showed a significant reduction in colony forming unit/toothbrush during 3 h evaluation. Group IIIa and IIIb showed nil growth during 3 h evaluation. Nil growth was observed with the control group for all three organisms. Statistically significant values were obtained for 5 min (P < 0.001) and 3 h (P < 0.001) disinfection period against L. acidophilus at two different concentrations.Conclusion: Aqueousextracts of guava leaves can be used as an alternative organic product for disinfection of toothbrushes.

scholarly journals Antioxidant and Anti-Diabetic Activities of Polysaccharides from Guava Leaves

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1343 ◽  
Author(s):  
You Luo ◽  
Bin Peng ◽  
Weiqian Wei ◽  
Xiaofei Tian ◽  
Zhenqiang Wu
Keyword(s):  
Antioxidant Activity ◽  
High Fat Diet ◽  
Functional Foods ◽  
Radical Scavenging ◽  
Psidium Guajava ◽  
Diabetic Mice ◽  
Total Antioxidant ◽  
Long Time ◽  
Guava Leaves

Guava (Psidium guajava L., Myrtaceae) leaves have been used as a folk herbal tea to treat diabetes for a long time in Asia and North America. In this study, we isolated polysaccharides from guava leaves (GLP), and evaluated its antioxidant activity in vitro and anti-diabetic effects on diabetic mice induced by streptozotocin combined with high-fat diet. The results indicated that GLP exhibited good DPPH, OH, and ABTS free-radical scavenging abilities, and significantly lowered fasting blood sugar, total cholesterol, total triglycerides, glycated serum protein, creatinine, and malonaldehyde. Meanwhile, it significantly increased the total antioxidant activity and superoxide dismutase (SOD) enzyme activity in diabetic mice, as well as ameliorated the damage of liver, kidney, and pancreas. Thus, polysaccharides from guava leaves could be explored as a potential antioxidant or anti-diabetic agents for functional foods or complementary medicine.

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