UV Light Transmission Research Articles

Monitoring the freshness of fish fillets by colorimetric gelatin composite film incorporated with curcumin extract

This study aimed to develop a colorimetric intelligent gelatin composite film incorporated with curcumin to monitor fish fillets' freshness. Chicken skin gelatin composite film's sensing ability in NH3 environments in light transmission and color changes was studied and compared to bovine gelatin composite films. A spoilage test was also performed to evaluate the practical application of colorimetric intelligent films in monitoring the real-time freshness of fish fillets within 4 days of storage time. The results showed that both films possessed low ultraviolet (0.41–1.00) and visible light transmission values (0.16–2.69) while exhibiting good response towards NH3 by changing their color from yellow to reddish-orange, with more obvious color changes at higher relative humidity and response time. The films also showed distinct color changes from yellow to reddish-orange, which were correlated with changes in pH levels of fish fillets within 4 days of storage time. Hence, this indicates that chicken skin gelatin-curcumin composite films could be utilized in colorimetric intelligent food packaging as a visual indicator to monitor the freshness of fish fillets.

Synergistic effect of nano zinc oxide and tea tree essential oil on the properties of soluble soybean polysaccharide films

Soluble soybean polysaccharide (SSPS)-based composite films with the addition of nano zinc oxide (nZnO, 5 wt% based on SSPS) and tea tree essential oil (TTEO, 10 wt% based on SSPS) were developed by the casting method. The effect of the combination of nZnO and TTEO on the microstructure and physical, mechanical and functional properties of SSPS films was evaluated. The results showed that the SSPS/TTEO/nZnO film exhibited enhanced water vapor barrier properties, thermal stability, water resistance, surface wettability, and total color difference, and almost completely prevented ultraviolet light transmission. The addition of TTEO and nZnO had no significant effect on the tensile strength and elongation at break of the films, but decreased the percentage of light transmittance of the films at 600 nm from 85.5 % to 10.1 %. The DPPH radical scavenging activity of the films significantly increased from 46.8 % (SSPS) to 67.7 % (SSPS/TTEO/nZnO) due to the presence of TTEO. Scanning electron microscopy analysis indicated that nZnO and TTEO were evenly dispersed in the SSPS matrix. The synergistic effect of nZnO and TTEO endowed the SSPS film with excellent antibacterial activity against E. coli and S. aureus, suggesting that the SSPS/TTEO/nZnO film could be a promising material for active packaging applications.

Bazı Organik Gözlük Camlarının Spektral ve Optik Özelliklerinin İncelenmesi

In this study, the spectral and optical properties of organic spectacle lenses used as visual aids were analyzed using Jasco V-730 UV/VIS spectrophotometer device in the ultraviolet and visible light wavelength ranges. The results obtained showed that the light transmittance in the wavelength (550nm) range to which the human eye is most sensitive in the lens samples examined was over 80% and that Polycarbonate (A3) lenses had a maximum value of 97.87%. The largest cut-off edge wavelength value was found to be 390nm for the A3 lens. At 550 nm for all lenses, the absorption spectrum was below 0.07. In terms of visual quality, it is expected that the visible light transmittance is high and the ultraviolet light transmission is minimal. Our eyes are exposed to ultraviolet rays almost every day, and these rays cause damage to the ocular tissues. The degree of damage caused by the amount of ultraviolet light absorption increases. Among the organic lenses with ultraviolet protection coating, the protection of the A3 lens was relatively higher. Furthermore, optical band gap energies were found to range from 3.145 – 4.155 eV and 2.994 – 3.936 eV for direct and indirect transitions, respectively. The highest optical band gap values were found to be those of the B1 and C1 organic lenses, respectively.

High-performance printed electrode with rapid fabrication based on UV and IPL light processes without thermal treatment

We developed flexible and ultraviolet (UV)-curable electrodes with improved electrical conductivity using two light processes. Existing microparticle electrodes have poor durability. In this study, we improved electrode durability by facilitating UV light transmission using nanosilver particles and increased electrical conductivity using the photonic sintering process as a posttreatment process. The formulation of the UV-curable nanosilver paste developed this way had no problem in the cross-cut tape test and showed excellent pencil hardness (>3H). Furthermore, the electrical resistivity was 2.76 × 10−5 Ω·cm, and the resistance change rate was <1 % even after 50,000 times of repetitive tests with a 3-mm radius of curvature. When twelve electrode patterns with LED installation and bent were manufactured, we confirmed that there was no change in brightness. Finally, as polyethylene terephtalate, a low-temperature substrate, was not damaged even after the process was completed, the paste and process showed sufficient performance even in the low-temperature process.

Development of active packaging films based on collagen/gallic acid-grafted chitosan incorporating with ε-polylysine for pork preservation

Active packaging films (CCG/PL) based on collagen, functionalized chitosan with gallic acid (GA), and ε-polylysine (ε-PL) (different amount of 2.5, 5, and 10 wt%, respectively) were developed to prolong the shelf life of pork stored at 4 °C. Fourier transform infrared analysis indicated that hydrogen bonds had formed between collagen molecules and GA moieties, and there were no strong interactions between polymers and ε-PL. SEM images showed that the cross-sections of CCG/PL films were compact but aggregation of ε-PL occurred when ε-PL content reached 10 wt%. CCG/PL films possessed strong light barrier properties with the UV light transmittance lower than 4% in the range of 200–350 nm. Compared with CC film, the DPPH free radical scavenging rate was significantly increased by 84.35% due to the synergistic effect of GA and ε-PL on antioxidant activity. CCG/PL film containing 5 wt% ε-PL had excellent antimicrobial activity against S. aureus as well as good tensile strength (65.34 MPa). The wrapping of CCG/PL film with 5 wt% ε-PL effectively retarded the lipid oxidation of pork and inhibited the growth of bacterium during the storage time, and the shelf life of pork was prolonged by approximately 5 days than that of pork in polyethylene film.

Lithography based Metal Manufacturing (LMM): Influence of particle size and composition of copper powder on UV light penetration

In this study, a Mie-theory-based computation was used to investigate the influence of two main factors (the particle size and the particle oxidation) affecting UV light transmission in copper loaded suspensions. The behavior of UV light penetration was then compared with highly loaded copper photocurable formulation used in 3D printing. According to the model, large particles (diameter > 2 µm) should be selected to afford UV transmission in a diluted (<10 vol%) copper suspension regardless of the oxidation of copper particles. For loading rate higher than 20 vol% transmission dramatically drops but the photopolymerization process remains efficient within the cured layer. This might confirm the hypothesis of UV light penetration through light scattering. Additional results on oxidized copper powders exhibited curing depths and curing kinetics that might be correlated to the less important light scattering compared to oxide-free powders. Solutions are proposed to tune curing depth by modifying the oxidation state of copper particles. The wise selection of copper powders and the application of thermal pre-treatment offers the opportunity to fabricate copper parts by Lithography based Metal Manufacturing (LMM).

Phenomenon of photo-regulation on gold/diamond Schottky barriers and its detector applications

A thickness asymmetric electrode structure on an oxygen-terminated type IIa diamond was designed and prepared (one electrode was semitransparent to ultraviolet light and the other blocked the transmission of ultraviolet light). This structure exhibited an apparent photo-induced rectification property under irradiation by a deuterium lamp. This is attributed to the mechanism by which the light penetrating the electrode reduces the metal–diamond contact barrier. Furthermore, we developed a light-modulated Schottky barrier diamond photodetector based on this mechanism. Solar-blind light can lower the Schottky barrier height in situ in the presence of light, which significantly enhances the photocurrent. However, the Schottky barrier is not reduced by light regulation when there is no light; therefore, the low dark current of the detector is still guaranteed. Compared with the non-photo-regulated Schottky barrier detector, the photo-regulated Schottky barrier detector exhibits a 128% increase in responsivity at 220 nm under a 1.6 V/μm bias. For such an obvious difference in detection performance, this mechanism has rarely been a focus of studies on diamond detectors. In addition to diamond detectors, light-modulated barrier technology can also be applied to other fields related to the diamond surface potential, such as color center control and Schottky diodes; it can also be used to control or evaluate device performance.

Photoinduced production of substances with humic-like fluorescence, upon irradiation of water samples from alpine lakes

Evidence is here provided that irradiation of some lake water samples can trigger the formation of fluorophores with humic-like properties, at the same time increasing water absorbance. This phenomenon is the opposite of photobleaching, which is often observed when natural waters are irradiated. The photoproduced humic-like fluorophores observed here would be of autochthonous rather than allochthonous origin, which marks a difference with the fraction of humic substances that derives from terrestrial sources. Photogeneration of humic-like compounds can be highlighted in water samples where the fluorescence signal of initially occurring humic substances is low, so that their photobleaching is minimised. Samples that are most likely to show photoinduced formation of humic-like fluorophores are in fact characterised by high values of protein-like vs. humic-like contribution ratios to fluorescence, as evidenced by parallel factor (PARAFAC) analysis. Mountain lakes in late summer appear to be suitable candidates to highlight the described phenomenon. In some cases, lake-water irradiation caused a decrease in the spectral slope of the absorbance that, together with increasing absorbance values, is consistent with an increase in molecular mass and aromaticity of organic matter. The absorbance increase triggered by irradiation might play a role in screening biologically harmful UV radiation, in mountain environments that would otherwise be characterised by very clear water that allows for easy transmission of UV light along the water column.

Effect of Kaolin clay and Ficus carica mediated silver nanoparticles on chitosan food packaging film for fresh apple slice preservation

In this work, a novel antioxidant, antibacterial, and biodegradable food packaging film was elaborated, by incorporating natural kaolin clay (KC) and Ficus carica mediated silver nanoparticles (AgNPs) into Chitosan (Cht). A comparison of the physico-chemical and functional characteristics of the Cht/KC/AgNPs film was performed with those of Cht, Cht/KC, and Cht/AgNPs. SEM analysis showed a rough surface in the composite films containing KC particles because of their large diameter (50–120 μm) compared to AgNPs (20–80 nm). The FTIR analysis suggested that the interactions between Cht and AgNPs were stronger than those between Cht and KC. The tensile strength of Cht film increased from 16 MPa to ∼24 MPa in Cht/KC/AgNPs film. The introduction of KC and/or AgNPs considerably improved the light and moisture barrier capacity of the Cht film. The UV light transmittance decreased by 50 % for Cht film when incorporated by KC and AgNPs. Moreover, Cht/AgNPs was better in terms of antioxidant, antibacterial, and mechanical compared to Cht/KC, which was superior in biodegradability and water vapor barrier capacity. In particular, the Cht/KC/AgNPs film presented good barrier, antioxidants, antibacterial, mechanical, and biodegradable properties, owing to the synergistic effect between KC and AgNPs. For the packaging properties, all the films were tested for their ability to keep the freshness of apple slices as wrapping material. The films exhibited good results, and the Cht/KC/AgNPs showed promising performance regarding the moisture loss, browning index, total phenolic compound, and antioxidant activity of the apple slices. Moreover, the Cht/KC/AgNPs film exhibited a migration of silver meeting the standards set by EFSA and ECHA, which makes this film safe for food packaging.

Development and characterization of chitosan/bacterial cellulose/pullulan bilayer film with sustained release curcumin

A natural biopolymer bilayer film based on chitosan and bacterial cellulose with a protective layer of pullulan was developed by a two-step solution casting method. Curcumin was incorporated as an active antioxidant and antibacterial agent into the inner layer. The films with different curcumin concentrations were systematically characterized. Fourier transform infrared spectroscopy and X-ray diffraction analyses showed high compatibility between curcumin and the polysaccharide matrix through intermolecular interactions, which was verified by enhanced mechanical and barrier properties. The curcumin incorporation improved the thermal stability by >35.4 %, along with lower visible and ultraviolet light transmittance (< 8.6 %) and water solubility (< 25.1 %). The film had both antibacterial and antioxidant properties, and the sustained release of curcumin was largest (> 58.8 %) in the fatty food simulant lasting for over 155 h. The results suggested that the film containing 0.2 % curcumin had ideal physical and functional properties, suggesting its potential as a novel packaging material for the preservation of high-fat food.

Characterization of high amylose corn starch-cinnamaldehyde inclusion films for food packaging

The antibacterial films prepared from high amylose corn starch-cinnamaldehyde (HACS-CIN) inclusion complex were reported in this work and the different structural, mechanical, physicochemical and antibacterial properties of the films were investigated. The FT-IR results supported that the CIN was encapsulated in the helical structure of HACS by self-assembly. The encapsulation efficiency was as high as 39.19%, and the releasing rate results showed HACS-CIN inclusion films could slow down the volatilization of CIN. The films showed excellent mechanical properties with tensile strength of 14.77 MPa and elongation at break of 44.95%; and good transparency with visible light transmittance of 70%. UV transmittance test showed good UV-blocking property with UV light transmittance of 30%. Antibacterial test indicated an inhibitory effect on S. aureus and E. coli. Strawberry preservation experiment showed the films delayed the shelf life of strawberries. This work provides the HACS-CIN inclusion films are potential candidates for biodegradable food packaging.

A Bioactive Chitosan-Based Film Enriched with Benzyl Isothiocyanate/α-Cyclodextrin Inclusion Complex and Its Application for Beef Preservation.

A bioactive packaging material based on chitosan (CS) incorporated with benzyl isothiocyanate (BITC) and α−cyclodextrin (α−CD) was fabricated to evaluate its preservative effects on fresh beef stored at 4 °C for 12 d according to the quality analysis. The Fourier-transform infrared (FTIR) spectrum revealed that the major structural moiety of BITC was embedded in the cavity of α−CD, except for the thiocyanate group. FTIR and X-ray diffraction analysis further verified that intermolecular interactions were formed between the BITC−α−CD and CS film matrix. The addition of BITC−α−CD decreased the UV light transmittance of pure CS film to lower than 63% but still had enough transparency for observing packaged items. The CS−based composite film displayed a sustainable antibacterial capacity and an enhanced antioxidant activity. Moreover, the total viable counts, total volatile base nitrogen, pH, thiobarbituric acid–reactive substances, and sensory evaluation of the raw beef treated with the CS−based composite film were 6.31 log colony-forming unit (CFU)/g, 19.60 mg/100 g, 6.84, 0.26 mg/kg, and 6.5 at 12 days, respectively, indicating the favorable protective efficacy on beef. These results suggested that the fabricated CS−based composite film has the application potential to be developed as a bioactive food packaging material, especially for beef preservation.

Visible‐Blind Deep Ultraviolet Photomultiplication Organic Photodetectors with Ultrahigh Gain for UVB and UVC Light Detection

AbstractPhotomultiplication‐type organic photodetectors (PM‐OPDs) have developed rapidly in UVA, visible and near‐infrared ranges, but they face great challenges in the UVB and UVC ranges, mainly due to the difficulty of simultaneously realizing deep UV light‐transmittance electrode and high gain structure. Here, the copper and silver bilayer composite electrodes are developed to overcome the problem of silver island growth, thus ensuring high deep UV light transmittance and good matching with electrical gain mechanism. The fabricated device shows high external quantum efficiency as high as 195,665% at 255 nm in UVC region. Furthermore, the above electrodes are integrated with low‐cost UV filter glass ZWB1 by simple vacuum evaporation. Finally, low‐cost visible‐blind deep UV PM‐OPDs with a rejection ratio of up to 4788 is achieved through an additional strategy of adjusting the absorption spectrum of the active layer. Benefiting from its fast response speed, the device can be directly applied to faint flame monitoring in real‐time.

PVA–Polystyrene-Based Polymer Films with Water-Induced Shape-Memory Effect

In this work, a series of novel water-induced shape-memory composite films are prepared on the basis of poly(vinyl alcohol)-polystyrene (PVA–PSX) through one pot in situ polymerization method. The neat PVA film is modified to PVA–PSX film by loading calibrated amount of styrene, and the resulted film exhibits high mechanical strength (tensile strength ∼40 MPa, tensile strain ∼315%, Young’s modulus ∼0.25 MPa and toughness ∼5 MJ/m3). More importantly, water-induced shape-memory behavior is observed for the PVA–PSX composite films and among various proportions, PVA–PS3 film (3 v/v% of styrene content) shows the fastest shape recovery rate (160 s). The relative low value of storage modulus and glass transition temperature of the PVA–PS3 films is attributed to water-induced shape recovery. The desirable and multifaceted properties of the PVA–PSX composite film, such as optimum transparency, improved water resistance, enhanced shape recovery, diminished UV-light transmission, and effectual antimicrobial activity, propound that the composite film is a suitable candidate for preparing packaging materials in food and cosmetic industries.

Preparing and Characterizing Novel Biodegradable Starch/PVA-Based Films with Nano-Sized Zinc-Oxide Particles for Wound-Dressing Applications

Given recent worldwide environmental concerns, biodegradability, antibacterial activity, and healing properties around the wound area are vital features that should be taken into consideration while preparing biomedical materials such as wound dressings. Some of the available wound dressings present some major disadvantages. For example, low water vapor transmission rate (WVTR), inadequate exudates absorption, and the complex and high environmental cost of the disposal/recycling processes represent such drawbacks. In this paper, starch/polyvinyl alcohol (PVA) material with inserted nano-sized zinc-oxide particles (nZnO) (average size ≤ 100 nm) was made and altered using citric acid (CA). Both ensure an efficient antibacterial environment for wound-dressing materials. The film properties were assessed by UV–Vis spectrometry and were validated against the UV light transmission percentage of the starch/ polyvinyl alcohol (PVA)/ zinc-oxide nanoparticles (nZnO) composites. Analyses were conducted using X-ray Spectroscopy (EDX) and scanning electron microscopy (SEM) to investigate the structure and surface morphology of the materials. Moreover, to validate an ideal moisture content around the wound area, which is necessary for an optimum wound-healing process, the water vapor transmission rate of the film was measured. The new starch-based materials exhibited suitable physical and chemical properties, including solubility, gel fraction, fluid absorption, biodegradability, surface morphology (scanning electron microscopy imaging), and mechanical properties. Additionally, the pH level of the starch-based/nZnO film was measured to study the prospect of bacterial growth on this wound-dressing material. Furthermore, the in vitro antibacterial activity demonstrated that the dressings material effectively inhibited the growth and penetration of bacteria (Escherichia coli, Staphylococcus aureus).

Development mechanism of aging depth of bitumen with increasing UV aging time

The UV aging of bitumen has a significant influence on the pavement service life, therefore, the research on UV aging has attracted increasing attention recently. It is known that the aging of bituminous pavements does not occur instantly through the full depth, instead, the aging depth of the bitumen increases gradually with the increasing aging time. The limitation of the research is that the development mechanism of the aging depth of bitumen is not clearly known. Various thicknesses of bituminous membranes were prepared and the UV light transmission and absorption properties of bituminous membranes were investigated by UV–visible spectrophotometric, aiming to determine the penetration depth of UV light in bitumen after UV aging. It is concluded that, for the same bituminous membrane, the transmittance of UV light increases with the increase of the light wavelength; while the transmittance of UV light decreases significantly with the increase of bituminous membrane thickness. The penetration depth of UV light in bitumen increases gradually with increasing UV aging time. The relationship between UV light penetration depth in bitumen and aging depth of bitumen was analyzed, and UV aging models of three parts of bitumen were established to reveal the development mechanism of the UV aging depth of bitumen during UV aging. The increasing aging depth of bitumen is due to the increase of UV light penetration depth in bitumen, and the diffusion action of aging products from surface bitumen to deeper bitumen. During the UV aging, the bitumen actually comprises three parts, namely, the surface direct aging part (UV light can reach), the deeper diffusion aging part (aged by the diffusion action) and the internal unaged part (UV light and diffusion action can not affect).

Recovery of gelatin from poultry waste: Characteristics of the gelatin and lotus starch-based coating material and its application in shelf-life enhancement of fresh cherry tomato

In recent years, food packaging has advanced from contaminating and polluting waste that remains after the use of the food product towards a functional ingredient that can be consumed along with the food product. Edible coatings are a healthy substitute for traditional food packaging. Therefore, the present study was aimed to develop edible coating material based on poultry waste gelatin and lotus stem starch for shelf-life extension of cherry tomatoes. The recovery of gelatin from chicken Feet (CF) and starch from lotus stem waste (LSW) was 14.5% and 9.20%, respectively and were used in different proportions for the development of the coating material. The flow behavior of coating material was pseudoplastic as the flow index (n) ranged from 0.332 to 0.428. The consistency coefficient (k) ranged from 1.62 to 4.92 Pa.sn, and it increased with the starch concentration. Storage modulus decreased with changing temperature from 10°C to 25°C and 10–35 °C in starch-free and starch-containing solutions, respectively. FTIR transmission band shifted from 3313 to 3343 cm−1 with changing the starch concentration from 0% to 10%, indicating the strong interactions of OH and amino groups. The transmission of UV light was low and remained unaffected, however, the transmittance showed a decrease with the starch concentration in the entire visible light range. The firmness and pH were retained to a greater extent and the weight loss in tomatoes was minimized during the 15 days of storage. The study revealed that this coating material may have great potential in the shelf-life extension of fresh fruits and vegetables.

Propiedades fisicoquímicas y antifúngicas de películas activas de gelatina-carboximetilcelulosa con extracto de cáscara de coco

Introduction: The formulation of bioactive packaging represents an innovative alternative to control the development of microorganisms affecting the shelf life of foods. Objective: The aim of this study was to analyze the effect of a coconut shell extract added to gelatincarboxymethylcellulose biopolymeric films on their physicochemical and antifungal properties to determine their potential use as packaging material for fruit and vegetable products. Methodology: Gelatin-carboxymethylcellulose films were prepared with different concentrations of coconut shell extract and their thickness, mechanical (puncture force and tensile strength), physical (water vapor permeability) and microstructural properties, color, FTIR, UV light transmittance, opacity and in vitro antifungal activity were determined. Results: Changes in mechanical, physical and microstructural properties were observed depending on the concentration of the extract. The color was modified by the effect of the extract, with higher opacity and lower light transmittance as its concentration increased. Intermolecular interactions between the biopolymers and the extract components were observed in the FTIR spectra. In vitro tests showed inhibitory capacity on the growth of Aspergillus niger and Rhizopus stolonifer. Limitations of the study: The effect of the coconut shell additive only applies to the extraction conditions used. Originality: There are no studies supporting the antifungal capacity of coconut shell extract added to biopolymer films. Conclusions: Active gelatin-carboxymethylcellulose films with antifungal activity were reported. The physical and structural properties of the films make them suitable for use as packaging material for fruit and vegetable products.

Vol4 num4-21 Molds manufactured with 3D printing for UV curing using Light-RTM

Ultraviolet (UV) curing is a competitive process both in terms of cycle time and energy consumption. However, it is limited to open mold processes where the material can be irradiated directly with UV light. There is a variant of RTM, Light-RTM, in which the flexible semi-mold can be manufactured with transparent/translucent materials and in small thicknesses. In the present work the feasibility of performing the semi-mold by stereolithography (SLA) has been studied. The photocurable resin selected for SLA was the high temperature resin from FormLabs. First, the UV light transmission has been characterized according to the thickness of the semi-mold wall, in which the mold thickness has been determined in 3 mm. The ageing process has also been analysed, characterising the variation of the transmitted spectrum as a function of the irradiation time for a 3 mm thick plate, where a loss of light transmission of approximately 13 % has been observed for 15 minutes of exposure time. Finally, a semi-mold has been manufactured for the manufacture by Light-RTM of a 150 mm &times; 40 mm &times; 2 mm flat plate. During the process, there were no problems of vacuum loss and the intensity of UV light that passes through the semi-mold allows curing the photocurable matrix of the composite material.

Optical Properties of Lentil Seed Coats Using Fiber-Optic Spectroscopy

HighlightsA fiber-optic spectroscopy system was set up and validated for measurement of optical properties of lentil seed coat.Light transmission properties of major lentil seed coat types were measured to evaluate their protective ability.Light transmission was detected mainly in the UVA and visible regions in all seed coat types except zero tannin.The protective abilities differed depending on seed coat type (important in breeding for cotyledon protection).Abstract. The light transmission of 20 lentil genotypes, representing six color classes (black, green, tan, brown grey, and zero tannin) was investigated to determine the degree to which seed coats prevent light transmission and possible photodegradation of cotyledon color. A fiber-optic spectroscopy system was set up for measurement; it consisted a deuterium-halogen light source, spectrometer, fiber-optic incidence and transmission probes, and sample holders. The nadir-aligned transmission spectra were measured in wavelength ranges of 250 to 850 nm. To study variability in light transmission of the different seed coat types, the curves were integrated in three wavelength regions to obtain Cumulative UV Transmission (CUVT, 250 to 400 nm), Cumulative VIS Transmission (CVIST, 401 to 700 nm), and Cumulative NIR Transmission (CNIRT, 701 to 850 nm), respectively. Tests for significant differences in light transmission were then done using analysis of variance (ANOVA) via General Linear Modelling and Posthoc GLM Tukey tests. Results showed that all the seed coat types, except zero tannin, showed no detectable transmission of UV light from 250 to 315 nm. Black seed coats showed detectable transmission from 615 to 850 nm, while other seed coat types transmitted varying percentages of light from 315 to 850 nm. The results of ANOVA showed that there were significant (p&amp;lt;0.05) differences in light transmission properties of the major seed coat types. Keywords: Fiber optics, Lentils, Light transmission, Pulse quality, Spectroscopy, Seed coat.