scholarly journals Different Postharvest Responses of Fresh-Cut Sweet Peppers Related to Quality and Antioxidant and Phenylalanine Ammonia Lyase Activities during Exposure to Light-Emitting Diode Treatments

Foods ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 359 ◽  
Author(s):  
Gludia M. Maroga ◽  
Puffy Soundy ◽  
Dharini Sivakumar
Keyword(s):  
Weight Loss ◽  
Phenylalanine Ammonia Lyase ◽  
Light Emitting Diode ◽  
Ascorbic Acid Content ◽  
Color Difference ◽  
Sweet Pepper ◽  
Blue Led ◽  
Led Light ◽  
Red Led ◽  
Fresh Cut

The influence of emitting diode (LED) treatments for 8 h per day on functional quality of three types of fresh-cut sweet peppers (yellow, red, and green) were investigated after 3, 7, 11, and 14 days postharvest storage on the market shelf at 7 °C. Red LED light (660 nm, 150 μmol m−2 s−1) reduced weight loss to commercially acceptable level levels (≤2.0%) in fresh-cuts of yellow and green sweet peppers at 7 and 11 d, respectively. Blue LED light (450 nm, 100 μmol m−2 s−1) maintained weight loss acceptable for marketing in red fresh-cut sweet peppers up to 11 d. Highest marketability with minimum changes in color difference (∆E) and functional compounds (total phenols, ascorbic acid content, and antioxidant activity) were obtained in yellow and green sweet pepper fresh-cuts exposed to red LED light up to 7 and 11 d, respectively, and for red sweet pepper fresh-cuts exposed to blue LED light for 11 d. Red LED light maintained the highest concentrations of β carotene, chlorophyll, and lycopene in yellow, green, and red sweet pepper fresh-cuts up to 7 d. Similarly, blue LED light showed the highest increase in lycopene concentrations for red sweet pepper fresh-cuts up to 7 d. Red LED (yellow and green sweet peppers) and blue LED (red sweet pepper) lights maintained phenolic compounds by increasing phenylalanine ammonia lyase activity. Thus, the results indicate a new approach to improve functional compounds of different types of fresh-cut sweet pepper.

scholarly journals Effect of 660 nm Light-Emitting Diode on the Wound Healing in Fibroblast-Like Cell Lines

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Myung-Sun Kim ◽  
Yong-Ick Cho ◽  
Min-Suk Kook ◽  
Sang-Chul Jung ◽  
Young-Hyun Hwang ◽  
...  
Keyword(s):  
Cell Proliferation ◽  
Wound Healing ◽  
Near Infrared ◽  
Light Emitting Diode ◽  
Biological Effects ◽  
Soft Tissue Injuries ◽  
Light Emitting ◽  
Led Light ◽  
Red Led ◽  
And Migration

Light in the red to near-infrared (NIR) range (630–1000 nm), which is generated using low energy laser or light-emitting diode (LED) arrays, was reported to have a range of beneficial biological effects in many injury models. NIR via a LED is a well-accepted therapeutic tool for the treatment of infected, ischemic, and hypoxic wounds as well as other soft tissue injuries in humans and animals. This study examined the effects of exposure to 660 nm red LED light at intensities of 2.5, 5.5, and 8.5 mW/cm2for 5, 10, and 20 min on wound healing and proliferation in fibroblast-like cells, such as L929 mouse fibroblasts and human gingival fibroblasts (HGF-1). A photo illumination-cell culture system was designed to evaluate the cell proliferation and wound healing of fibroblast-like cells exposed to 600 nm LED light. The cell proliferation was evaluated by MTT assay, and a scratched wound assay was performed to assess the rate of migrating cells and the healing effect. Exposure to the 660 nm red LED resulted in an increase in cell proliferation and migration compared to the control, indicating its potential use as a phototherapeutic agent.

scholarly journals Effect of Artificial Night Lighting on the Growth of Loose Head Lettuce in Hydroponic System

2020 ◽  
Vol 49 (12) ◽  
pp. 2891-2900
Author(s):  
H.S. Chua ◽  
Siew Wei Lai ◽  
Sivajothi Paramasivam ◽  
T.T. Goh ◽  
Gee Chia Chen
Keyword(s):  
Light Exposure ◽  
Natural Light ◽  
Fresh Weight ◽  
Shoot Height ◽  
Blue Led ◽  
Lighting Technology ◽  
Led Light ◽  
Red Led ◽  
Hydroponic Systems ◽  
Power Outputs

Supplemental LEDs lighting technology has been used as the promising lighting source in hydroponic cultures for sustainable production in urban agriculture. It could be the solution to address the growing concern about food safety, environmental impacts, bad weather, and efficient energy usage in agricultural production. In this study, the response of loose head lettuce toward the irradiance of the supplemental red-blue LED light with different power (Watt [W]) was investigated by comparing the treated lettuce with the lettuce cultured under only natural light. The lettuce plants were treated with red LED (640-660 nm) + blue LED (440-450 nm). The power output of the LEDs was specified to 3, 6, 9, 15, and 20 W. The lettuce plants were hydroponically cultured with 8 h red-blue LEDs light exposure (from 12 to 8 am) and 16 h without the red-blue LEDs light exposure (from 8 pm to 12 am) at average air temperatures of 31/28 ºC (day/night) for 50 days (7 weeks). On the harvesting day, the average shoot heights of the lettuce that was treated with 3, 6, 9, 15, 20 LEDs and natural light were 25.00, 24.75, 20.75, 19.88, 17.63, and 12.63 cm, respectively. The lettuce that was exposed to the 3 W LEDs had the highest shoot height compared to those that were exposed to LEDs with other power outputs. The average fresh weights of the lettuce that was treated with 3, 6, 9, 15, 20 W LEDs and natural light were 27.25, 24.75, 21.25, 19.88, 18.38, and 15.75 g, respectively. The results showed that the fresh weight of the lettuce that was irradiated with 3 W LED light was significantly higher compared to the lettuce that was exposed to LEDs with other power outputs. Hence, it can be concluded that supplementary LEDs lighting technology can be used as an alternative lighting source to improve the growth of lettuce in hydroponic systems. Moreover, the use of 3 W LEDs in hydroponic systems could yield a higher shoot weight and fresh weight.

scholarly journals The effects of LED light spectrum manipulation on growth and color performance of giant gourami Osphronemus gouramy Lacepede Padang strain

2022 ◽  
Vol 21 (1) ◽  
pp. 11-21
Author(s):  
Bambang Kusmayadi Gunawan ◽  
Kukuh Nirmala ◽  
Dinar Tri Soelistyowati ◽  
Daniel Djokosetiyanto ◽  
Wildan Nurussalam
Keyword(s):  
Light Emitting Diode ◽  
Emission Spectra ◽  
Control Treatment ◽  
Light Spectrum ◽  
Light Emitting ◽  
Blue Led ◽  
Pectoral Fins ◽  
Randomized Design ◽  
Red Led ◽  
Effect Of Light

This study aimed to evaluate the effect of light spectrum on growth and color performance of giant giant gourami Padang strain. The experiment used a completely randomized design (RAL) with four light emitting diode (LED) treatments in  different emission spectra (white, red, green, and blue) at 550 Lux intensity, compared to the control treatment (light room with white tubular lamp at 50 Lux intensity). The irradiation was carried out for 12 hours of photoperiod. The fish used had the total length of 82.90±4.2 mm and body weight of 9.87 ± 0.99 g. The highest growth performance was found in blue LED treatment with the specific growth rate of  2.73 ± 0.2% and feed efficiency of 86.26 ± 2.71%. The best color performance was found in red LED treatment with the RGB ratio of 44.57 ± 0.62% in dorsal fin, 38.41 ± 1.36% in pectoral fins, and 45.33 ± 2.25% in anal fin with the chromatophore cell concentration at 1.973±58 cells/mm2.   Keywords : Osphronemus gouramy, blue LED, spectrum, chromatophore, light   ABSTRAK   Penelitian ini bertujuan untuk mengevaluasi pengaruh spektrum cahaya terhadap kinerja pertumbuhan dan warna ikan gurami strain Padang. Rancangan penelitian yang digunakan adalah rancangan acak lengkap (RAL) dengan 4 perlakuan cahaya lampu light emitting diodes (LED)  yang memiliki spektrum panjang gelombang berbeda (putih, merah, hijau dan biru) intensitas 550 Lux dan kontrol (cahaya ruang berasal dari lampu tubular putih intensitas 50 Lux). Penyinaran dilakukan selama 12 jam mengikuti fotoperiod. Ikan uji yang digunakan memiliki panjang total 82,90 ± 4,2 mm, dengan bobot 9,87 ± 0,99 g. Kinerja pertumbuhan terbaik terdapat pada perlakuan LED biru dengan laju pertumbuhan spesifik sebesar 2,73 ± 0,2% dan efisiensi pakan sebesar 86,26 ± 2,71%. Performa warna terbaik terdapat pada perlakuan LED merah dengan rasio warna merah pada RGB bagian dorsal sebesar 44,57 ± 0,62%, sirip pektoral sebesar 38,41 ± 1,36%, dan sirip anal sebesar 45,33 ±  2,25% dengan jumlah sel kromatofor sebanyak 1973 sel/mm2.   Kata kunci : Osphronemus gouramy, LED biru, spektrum, kromatofor, cahaya        

PHOTOTHERAPY FOR MILD TO MODERATE ACNE VULGARIS WITH PORTABLE BLUE AND RED LED

2011 ◽  
Vol 04 (01) ◽  
pp. 45-52 ◽  
Author(s):  
GUANGDA LIU ◽  
CHANGE PAN ◽  
KAI LI ◽  
YUAN TAN ◽  
XUNBIN WEI
Keyword(s):  
Side Effects ◽  
Light Emitting Diode ◽  
Acne Vulgaris ◽  
Red Light ◽  
Light Sources ◽  
Light Emitting ◽  
Led Light ◽  
Led Phototherapy ◽  
Red Led ◽  
Complete Treatment

In this paper, we studied portable blue and red light-emitting-diode (LED) light sources in phototherapy for mild to moderate acne vulgaris to evaluate the efficacy and tolerance of patients. Patients, randomly divided into blue and red groups, received either blue or red LED phototherapy twice a week for four weeks. After complete treatment, the number of lesions reduced by 71.4% in the blue group, in contrast to 19.5% in the red group. No obvious side effects were observed during and one month after the treatment, except for some mild dryness mentioned by several patients.

scholarly journals Changes in Beneficial C-glycosylflavones and Policosanol Content in Wheat and Barley Sprouts Subjected to Differential LED Light Conditions

Plants ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1502
Author(s):  
Muthusamy Muthusamy ◽  
Jong Hee Kim ◽  
Suk Hee Kim ◽  
Joo Yeol Kim ◽  
Jeong Wook Heo ◽  
...  
Keyword(s):  
Light Quality ◽  
Higher Plants ◽  
Light Emitting Diode ◽  
Growth Period ◽  
Light Irradiation ◽  
Fluorescent Light ◽  
Light Conditions ◽  
Wheat Seedlings ◽  
Blue Led ◽  
Led Light

The spectral quality and intensity of light, photoperiodism, and other environmental factors have profound impacts on the metabolic composition of light-dependent higher plants. Hence, we investigate the effects of fluorescent light (96 μmol m−2s−1) and white (100 μmol m−2s−1), blue (100 μmol m−2s−1), and red (93 μmol m−2s−1) light-emitting diode (LED) light irradiation on the C-glycosylflavone and policosanol contents in young seedlings of wheat and barley. Ultra-high-performance liquid chromatography (UHPLC) analyses of C-glycosylflavone contents in barley reveal that the saponarin content is significantly enhanced under blue LED light irradiation. Under similar conditions, isoorientin and isoschaftoside contents are improved in wheat seedlings. The contents of these C-glycosylflavones differed along with the light quality and growth period. The highest accumulation was observed in sprouts after three days under blue LED light irradiation. GC/MS analyses of policosanol contents showed that 1-hexacosanol (C26:o–OH) in barley and 1-octacosanol (C28:o–OH) in wheat seedlings were reduced under LED light irradiation, compared to seedlings under fluorescent light conditions. Nonetheless, the policosanol contents gradually improved with the extension of growth times and treatments, irrespective of the light quality. Additionally, a positive correlation was observed between the expression pattern of biosynthesis-related genes and the respective metabolite content in barley. This study demonstrates that blue LED light irradiation is useful in maximizing the C-glycosylflavone content in barley and wheat sprouts.

scholarly journals Efek Kombinasi Musik Gamelan Gong Kebyar dan Cahaya LED (Light Emitting Diode) Terhadap Pertumbuhan dan Produktivitas Sawi Pakcoy (Brassica rapa L.)

2019 ◽  
Vol 8 (1) ◽  
pp. 1
Author(s):  
Gede Teguh Sigmarawan ◽  
I Made Anom S. Wijaya ◽  
I Putu Gede Budisanjaya
Keyword(s):  
Plant Height ◽  
Root Length ◽  
Light Emitting Diode ◽  
Dry Weight ◽  
White Led ◽  
Blue Led ◽  
Led Light ◽  
Shoot Dry Weight ◽  
Canopy Area ◽  
Wet Weight

This study aims to (1) determine the effect of the combination of gong kebyar gamelan music and LED light on the growth and productivity of pakcoy mustard and (2) determine the combination of gong kebyar gamelan music and LED light that provides the best growth and productivity in pakcoy mustard plants. This study used pakcoy mustard plants which are given a treatment of the combination of gong kebyar gamelan music and different LED light. The first treatment used a combination of gong kebyar gamelan music and white LED light, treatment 2 used a combination of gong kebyar gamelan music and red blue LED light, and treatment 3 used a combination of gong kebyar gamelan music and blue red and white LED light. The data obtained were analyzed using one way anova test and followed by Duncan test with a confidence level of 95%. The variables observed were plant height, canopy area, leaf greenness, root length, wet weight and dry weight of plant shoots and roots. The results showed that giving a combination of gong kebyar gamelan music and LED light had a significant effect on the growth and productivity of pakcoy mustard. The combination of gong kebyar gamelan music and red blue LED light gave the best growth and productivity, with plant height, canopy area, leaf greenery, root length, shoot wet weight, root wet weight, shoot dry weight and root dry weight, respectively also included 27,176 cm, 1457.59cm2, 160.03, 23.6cm, 91.68g, 4.63g, 5.26g, 4.63g and 0.42g.

scholarly journals Embryo Development and Behavior in Sea Urchin (Tripneustes gratilla) Under Different Light Emitting Diodes Condition

2021 ◽  
Vol 8 ◽  
Author(s):  
Yi-Yen Li ◽  
Feng-Jie Su ◽  
Yi-Jui Hsieh ◽  
Tai-Chun Huang ◽  
Yung-Song Wang
Keyword(s):  
Embryonic Development ◽  
Full Spectrum ◽  
Light Emitting ◽  
Blue Led ◽  
Led Light ◽  
Phototactic Response ◽  
Red Led ◽  
Tripneustes Gratilla ◽  
Strong Stimulation ◽  
And Behavior

This study aims to evaluate the effect of light-emitting diodes (LEDs) of different wavelengths on the embryonic development, covering behavior, righting behavior, and phototaxis of collector urchins (Tripneustes gratilla). The collector urchins were divided into three groups according to the type of LED illumination they received: full-spectrum (400–750 nm wavelength), red light (630 nm), or blue light (450 nm). The results of the embryonic development experiment indicated that the blue LED group had the highest proportion of embryos reaching the prism stage at the 24th hour and the highest proportion of embryos entering the 4-arm pluteus stage, but it also had the highest death rate at the 48th hour. The full-spectrum and red LED groups exhibited similar speeds of embryonic development. In the experiment on covering behavior performed on adult urchins, our findings indicated that the blue LED group gripped the most acrylic sheets for cover, exhibiting the most covering behavior, followed by the full-spectrum group and then the red LED group. Moreover, behavior varied with coloration, as collector urchins with a lower level of melanin exhibited more covering behavior than those with a higher melanin level. In addition, the righting behavior experiments demonstrated that the blue LED group spent the longest time righting themselves. It is possible that the relatively strong stimulation from the blue LED illumination led to a higher level of stress in the collector urchins and hence slowed their righting. The phototaxis experiment revealed the most significant negative phototactic response in collector urchins when they were under the blue LED light, followed by the full-spectrum light; the red LED light did not induce any positive or negative phototactic response in the collector urchins. This experimental result verified collector urchins’ high sensitivity to and dislike of the blue LED light. The study results confirmed that the blue LED light environment accelerated the embryonic development of collector urchins; however, the relatively strong stimulation from that light also caused them to engage in covering behavior or move away from the light. These results indicate that short-wavelength irradiation significantly affects the embryonic development and behavior pattern of this species.

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